1. //program to demonstrate if statement example 1 , check whether number is equal to 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a == 10)
            {
                Console.WriteLine("value of a is equal to 10");
            }
            Console.ReadLine();
        }
    }
}

2. //program to demonstrate if statement example 2, check whether a number is greater than 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a > 10)
            {
                Console.WriteLine("value of a is greater than 10");
            }
            Console.ReadLine();
        }
    }
}

3. //program to demonstrate if statement example 3,program to find whether number is less than 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a < 10)
            {
                Console.WriteLine("value of a is less than 10");
            }
            Console.ReadLine();
        }
    }
}

4. //program to demonstrate if statement example 4 , check whether number is less than or equal to 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a <= 10)
            {
                Console.WriteLine("value of a is less than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

5. //program to demonstrate if statement example 5 , check whether number is greater than or equal to 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a >= 10)
            {
                Console.WriteLine("value of a is greater than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

6. //program to demonstrate if statement example 6 , check whether number is not equal to 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a != 10)
            {
                Console.WriteLine("value of a is not equal to 10");
            }
            Console.ReadLine();
        }
    }
}

7. //program to demonstrate if-else statement example 1 , check whether number is equal to 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a == 10)
            {
                Console.WriteLine("value of a is equal to 10");
            }
            else
            {
                Console.WriteLine("value of a is not equal to 10");
            }
            Console.ReadLine();
        }
    }
}

8. //program to demonstrate if-else statement example 2 , check whether number is greater than 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a > 10)
            {
                Console.WriteLine("value of a is greater than 10");
            }
            else
            {
                Console.WriteLine("value of a is less than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

9. //program to demonstrate if-else statement example 3 , check whether number is less than 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a < 10)
            {
                Console.WriteLine("value of a is less than 10");
            }
            else
            {
                Console.WriteLine("value of a is greater than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

10. //program to demonstrate if-else statement example 4, check whether number is equal to 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a != 10)
            {
                Console.WriteLine("value of a is not equal to 10");
            }
            else
            {
                Console.WriteLine("value of a is equal to 10");
            }
            Console.ReadLine();
        }
    }
}

11. //program to demonstrate if-else statement example 5, check whether number is greater than 10 or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a > 10)
            {
                Console.WriteLine("value of a is greater than 10");
            }
            else
            {
                Console.WriteLine("value of a is less than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

12. //program to demonstrate if-else statement example 6, check whether a is less than or equal to 10 or greater than 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a < 10)
            {
                Console.WriteLine("value of a is less than 10");
            }
            else
            {
                Console.WriteLine("value of a is greater than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

13. //program to demonstrate if-else statement example 7, check whether a is greater than or equal to 10 or less than 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a > 10)
            {
                Console.WriteLine("value of a is greater than 10");
            }
            else
            {
                Console.WriteLine("value of a is less than 10 or equal to 10");
            }
            Console.ReadLine();
        }
    }
}

14. //program to demonstrate if-else statement example 8, check whether a is greater than or equal to 10 or less than 10 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a >= 10)
            {
                Console.WriteLine("value of a is greater than 10 or equal to 10");
            }
            else
            {
                Console.WriteLine("value of a is less than 10");
            }
            Console.ReadLine();
        }
    }
}

15. //program to demonstrate if-else statement example 9, check whether a is less than or equal to 10 or greater than 10

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            if (a <= 10)
            {
                Console.WriteLine("value of a is less than 10 or equal to 10");
            }
            else
            {
                Console.WriteLine("value of a is greater than 10");
            }
            Console.ReadLine();
        }
    }
}

16. //program to input temperature in celsius and check whether it is boiling point of water or not 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int temp;
            Console.WriteLine("Enter temperature");
            temp = Convert.ToInt32(Console.ReadLine());
            if (temp == 100)
            {
                Console.WriteLine("It is boiling point of water");
            }
            else
            {
                Console.WriteLine("It is not boiling point of water");
            }
            Console.ReadLine();
        }
    }
}

17. //program to input marks and check whether student is passed with distinction or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int marks;
            Console.WriteLine("Enter temperature");
            marks = Convert.ToInt32(Console.ReadLine());
            if (marks >=75 )
            {
                Console.WriteLine("Passed with distinction");
            }
            else
            {
                Console.WriteLine("Pass");
            }
            Console.ReadLine();
        }
    }
}

18. //program to input age and check whether person is eligible to vote or not

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int age;
            Console.WriteLine("Enter age");
            age = Convert.ToInt32(Console.ReadLine());
            if (age >=18 )
            {
                Console.WriteLine("Eligible to Vote");
            }
            else
            {
                Console.WriteLine("Not Eligible to Vote");
            }
            Console.ReadLine();
        }
    }
}

19. //program to input three numbers and find largest of three numbers using if-else statement without using fourth variable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c;
            Console.WriteLine("Enter value for a ");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for b ");
            b = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for c ");
            c = Convert.ToInt32(Console.ReadLine());
            if ((a > b) && (a > c))
            {
                Console.WriteLine(a + " is largest");
            }
            if ((b > a) && (b > c))
            {
                Console.WriteLine(b + " is largest");
            }
            if ((c > a) && (c > b))
            {
                Console.WriteLine(c + " is largest");
            }
            Console.ReadLine();
        }
    }
}

20. //program to input three numbers and find largest of three numbers using if-else statement with using fourth variable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c, max;
            Console.WriteLine("Enter value for a ");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for b ");
            b = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for c ");
            c = Convert.ToInt32(Console.ReadLine());
            max = a;
            if (b > max)
            {
                max = b;
            }
            if (c > max)
            {
                max = c;
            }
            Console.WriteLine(max + " is largest");
            Console.ReadLine();
        }
    }
}

21. //program to input three numbers and find smallest of three numbers using if-else statement without using fourth variable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c;
            Console.WriteLine("Enter value for a ");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for b ");
            b = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for c ");
            c = Convert.ToInt32(Console.ReadLine());
            if ((a < b) && (a < c))
            {
                Console.WriteLine(a + " is smallest");
            }
            if ((b < a) && (b < c))
            {
                Console.WriteLine(b + " is smallest");
            }
            if ((c < a) && (c < b))
            {
                Console.WriteLine(c + " is smallest");
            }
            Console.ReadLine();
        }
    }
}

22. //program to input three numbers and find smallest of three numbers using if-else statement with using fourth variable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c, min;
            Console.WriteLine("Enter value for a ");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for b ");
            b = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value for c ");
            c = Convert.ToInt32(Console.ReadLine());
            min = a;
            if (b < min)
            {
                min = b;
            }
            if (c < min)
            {
                min = c;
            }
            Console.WriteLine(min + " is smallest");
            Console.ReadLine();
        }
    }
}

23. //program to demonstrate if-else statement and (check whether marks are between 80 and 90)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int marks;
            Console.WriteLine("Enter Marks ");
            marks = Convert.ToInt32(Console.ReadLine());
            if ((marks >= 80) && (marks <= 90))
            {
                Console.WriteLine("Marks are between 80 and 90");
            }
            else
            {
                Console.WriteLine("Marks are not between 80 and 90");
            }

            Console.ReadLine();
        }
    }
}

24. //program to demonstrate if-else statement program to demonstrate if or (check whether marks are equal to either 80 or 90

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int marks;
            Console.WriteLine("Enter Marks ");
            marks = Convert.ToInt32(Console.ReadLine());
            if ((marks == 80) || (marks == 90))
            {
                Console.WriteLine("Marks are either 80 or 90");
            }
            Console.ReadLine();
        }
    }
}

25. //program to input a character and check whether it is equal to a or b using if statement example of OR ( || ) operator

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            char ch = 'a';
            if ((ch == 'a') || (ch == 'b'))
            {
                Console.WriteLine("Character is either a or b");
            }
            Console.ReadLine();
        }
    }
}

26. //program to compute grade of a student based on marks using if else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int marks;
            char grade;
            Console.WriteLine("Enter marks");
            marks = Convert.ToInt32(Console.ReadLine());
            if ((marks >= 80) && (marks <= 100))
            {
                grade = 'a';
            }
            else if ((marks >= 70) && (marks < 80))
            {
                grade = 'b';
            }
            else if ((marks >= 60) && (marks < 70))
            {
                grade = 'c';
            }
            else
            {
                grade = 'd';
            }
            Console.WriteLine("Grade obtained by student is " + grade);
            Console.ReadLine();
        }
    }
}

27. //program to check whether number entered is odd or even using if-else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a;
            Console.WriteLine("Enter a number");
            a=Convert.ToInt32(Console.ReadLine());
            if(a%2==0)
	        {
		        Console.WriteLine("a is an even number");
	        }
	        else
	        {
		        Console.WriteLine("a is an odd number");
	        }
            Console.ReadLine();
        }
    }
}

28. //program to input two numbers a and b and check whether a is divisible by b or not using if-else

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a,b;
            a=10;
            b=5;
            Console.WriteLine("Enter first number");
            a=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b=Convert.ToInt32(Console.ReadLine());
	        if(a%b==0)
	        {
		        Console.WriteLine("a is divisible by b");
	        }
	        else
	        {
		        Console.WriteLine("a is not divisible by b");
	        }
            Console.ReadLine();
        }
    }
}

29. //program to check whether user has entered vowel or not using if-else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            char ch;
            string str= Console.ReadLine().Substring(0, 1);
            ch = Convert.ToChar(str);
	    if((ch=='a') || (ch=='e') || (ch=='i') || (ch=='o') || (ch=='u'))
	    {
		Console.WriteLine("you entered a vowel");
	    }
	    else
	    {
		Console.WriteLine("you have not entered a vowel");
	    }

            Console.ReadLine();
        }
    }
}

30. //program to calculate discount on a price,if price is above 1000 then discount is 10% otherwise 5 %

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            double price,discount;
            Console.WriteLine("Enter amount");
            price=Convert.ToDouble(Console.ReadLine());
	        if(price>=1000)
	        {
		        discount=0.1*price;
	        }
	        else
	        {
		        discount=0.05*price;
	        }
	        Console.WriteLine("discount is " + discount);

            Console.ReadLine();
        }
    }
}

31. //program to demonstrate switch-case statement example 1, displaying day of the week

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int day;
            Console.WriteLine("Enter a day in number");
            day=Convert.ToInt32(Console.ReadLine());
	        switch(day)
	        {
	            case 1:
		                Console.WriteLine("monday");
		                break;
	            case 2:
		                Console.WriteLine("tuesday");
                        break;
	            case 3:
		                Console.WriteLine("wednesday");
		                break;
	            case 4:
		                Console.WriteLine("thursday");
		                break;
	            case 5:
		                Console.WriteLine("friday");
		                break;
	            case 6:
		                Console.WriteLine("saturday");
		                break;
	            case 7:
		               Console.WriteLine("sunday");
		                break;
	            default:
                       Console.WriteLine("enter a day between 1 and 7");
                       break;
	        }


            Console.ReadLine();
        }
    }
}

32. //program to demonstrate switch-case statement example 1, displaying day of the week

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int month;
            Console.WriteLine("Enter a month in number");
            month=Convert.ToInt32(Console.ReadLine());
	        switch(month)
	        {
	            case 1:
		                Console.WriteLine("January");
		                break;
	            case 2:
		                Console.WriteLine("February");
                        break;
	            case 3:
		                Console.WriteLine("March");
		                break;
	            case 4:
		                Console.WriteLine("April");
		                break;
	            case 5:
		                Console.WriteLine("May");
		                break;
	            case 6:
		                Console.WriteLine("June");
		                break;
	            case 7:
		               Console.WriteLine("July");
		                break;
                case 8:
                        Console.WriteLine("August");
                        break;
                case 9:
                        Console.WriteLine("September");
                        break;
                case 10:
                        Console.WriteLine("October");
                        break;
                case 11:
                        Console.WriteLine("November");
                        break;
                case 12:
                        Console.WriteLine("December");
                        break;
	            default:
                       Console.WriteLine("enter a month between 1 and 12");
                       break;
	        }


            Console.ReadLine();
        }
    }
}

33. //calculate da,hra based on basic example of if-else statement
//(if basic<=2500,hra=da=0,if basic>=2500&&<4000,hra=20%,da=15% if basic>=4000&&<8000,hra=25,da=20,if basic>8000,hra=30,da=25)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            double basic,hra,da,netsal;
            Console.WriteLine("Enter basic salary");
            basic=Convert.ToDouble(Console.ReadLine());
            if(basic<=2500)
            {
                hra=0;
                da=0;
            }
            else if((basic>=2500) && (basic<4000))
                {
                    hra=0.2f*basic;
                    da=0.15f*basic;
                }
            else if((basic>=4000) && (basic<8000))
                {
                    hra=0.25f*basic;
                    da=0.2f*basic;
                }
            else
                {
                    hra=0.3f*basic;
                    da=0.25f*basic;
                }
        netsal=basic+hra+da;
        Console.WriteLine("hra is " + hra);
        Console.WriteLine("da is " + da);
        Console.WriteLine("net salary is " + netsal);


            Console.ReadLine();
        }
    }
}

34. //program to input three numbers and print them in ascending order using if-else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a,b,c,low,low2,low3;
            Console.WriteLine("Enter first number");
            a=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter third number");
            c=Convert.ToInt32(Console.ReadLine());
	        low=a;
            low2=a;
            low3=a;
	        if(b<low)
	        {
		        low=b;
	        }
	        if(c<low)
	        {
		        low=c;
	        }
	        if(a==low)
	        {
		        if(b<c)
		        {
			        low2=b;
			        low3=c;
		        }
		        else
		        {
			        low2=c;
			        low3=b;
		        }
	        }
	        else
		        if(b==low)
		        {
			        if(a<c)
			        {
				        low2=a;
				        low3=c;
			        }
			        else
			        {
				        low2=c;
				        low3=a;
			        }
		        }
		        else
			        if(c==low)
			        {
				        if(a<b)
				        {
					        low2=a;
					        low3=b;
				        }
				        else
				        {
					        low2=b;
					        low3=a;
				        }
			        }
	        Console.WriteLine(low + "," + low2 + "," + low3);
            Console.ReadLine();
        }
    }
}

35. //program to input three numbers and print them in descending order using if-else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a,b,c,big,big2,big3;
            Console.WriteLine("Enter first number");
            a=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter third number");
            c=Convert.ToInt32(Console.ReadLine());

	            big=a;
                big2=a;
                big3=a;
	            if(b>big)
	            {
		            big=b;
	            }
	            if(c>big)
	            {
		            big=c;
	            }
	            if(a==big)
	            {
		            if(b>c)
		            {
			            big2=b;
			            big3=c;
		            }
		            else
		            {
			            big2=c;
			            big3=b;
		            }
	            }
	            else
		            if(b==big)
		            {
			            if(a>c)
			            {
				            big2=a;
				            big3=c;
			            }
			            else
			            {
				            big2=c;
				            big3=a;
			            }
		            }
		            else
			            if(c==big)
			            {
				            if(a>b)
				            {
					            big2=a;
					            big3=b;
				            }
				            else
				            {
					            big2=b;
					            big3=a;
				            }
			            }
	        Console.WriteLine(big + "," + big2 + "," + big3);
            Console.ReadLine();
        }
    }
}

36. //program to convert fahrenheit temp to celsius and vice versa using if-else statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int choice;
            double temp,conv;
            Console.WriteLine("Enter your choice 1 for fahrenheit to celsius and 2 for celsius to fahrenheit");
            choice=Convert.ToInt32(Console.ReadLine());
            if(choice==1)
            {
                Console.WriteLine("Enter tempearture in fahrenheit");
                temp=Convert.ToDouble(Console.ReadLine());
                conv=(temp-32)/1.8;
                Console.WriteLine("temperature in celsius is " + conv);
            }
            else
            {
                Console.WriteLine("Enter tempearture in celsius");
                temp=Convert.ToDouble(Console.ReadLine());
                conv=(1.8*temp)+32;
                Console.WriteLine("temperature in fahrenheit is " + conv);
            }
            Console.ReadLine();
        }
    }
}

37. //program to input a character and check whether it is a vowel or not using switch statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
                char ch;
                Console.WriteLine("Enter a character");
                string str= Console.ReadLine().Substring(0, 1);
                ch = Convert.ToChar(str);
	            switch(ch)
	            {
	            case 'a':
		            Console.WriteLine("you entered a vowel");
	                break;
	            case 'e':
		            Console.WriteLine("you entered a vowel");
		            break;
	            case 'i':
		            Console.WriteLine("you enetred a vowel");
		            break;
	            case 'o':
		            Console.WriteLine("you enetred a vowel");
		            break;
	            case 'u':
		            Console.WriteLine("you entered a vowel");
		            break;
	            default:
                    Console.WriteLine("enter a vowel (a,e,i,o,u)");
                    break;

	            }
            Console.ReadLine();
        }
    }
}

38. //program to input a character and check whether it is a vowel or not using switch statement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int year;
            Console.WriteLine("Enter a year");
            year=Convert.ToInt32(Console.ReadLine());
            if((year%100==0) || (year%400==0))
            {
                Console.WriteLine("leap year");
            }
            else
            {
                if(year%4==0)
                {
                    Console.WriteLine("leap year");
                }
                else
                {
                    Console.WriteLine("not a leap year");
                }
    }
            Console.ReadLine();
        }
    }
}