1. //program to demonstrate user defined function,create a function to display hello world on the screen

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

namespace ConsoleApplication1
{
    class phello
    {
        public void prhello()
    {
        Console.WriteLine("Hello World");
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

               phello ob = new phello();
               ob.prhello();
               Console.ReadLine();
        }
    }
}

2. //program to create a function that checks whether a number is even or odd (number is passed to function as argument)

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

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

            evenodd ob = new evenodd();
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            ob.checkeodd(a);
            Console.ReadLine();
        }
    }
}

3. //program to find create a function to check whether a number passed to it as argument is prime or not

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

namespace ConsoleApplication1
{
    class prime
    {
        public void cprime(int a)
    {
        int i;
	    int prime=1;
	    for(i=2;i<=a/2;i++)
	    {
		    if(a%i==0)
		    {
			    prime=0;
			    break;
		    }
	    }
	    if(prime==1)
	    {
		    Console.WriteLine("number passed to function is prime");
	    }
	    else
	    {
		    Console.WriteLine("number passed to function is not prime");
	    }

    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            prime ob = new prime();
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            ob.cprime(a);
            Console.ReadLine();
        }
    }
}

4. //program to create a function that prints the table of the number passed to it as argument

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

namespace ConsoleApplication1
{

    class table
    {
        public void ptable(int a)
    {
        int i;
	    for(i=1;i<=10;i++)
	    {
		    Console.WriteLine(a*i);
	    }
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            table ob = new table();
            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            ob.ptable(a);
            Console.ReadLine();
        }
    }
}

5. //program to create a function that takes two integers arguments and calculates their sum

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

namespace ConsoleApplication1
{

    class findsum
    {
        public void sum(int a, int b)
    {
        int sum;
	    sum=a+b;
	    Console.WriteLine("sum of numbers is " + sum);
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            findsum ob = new findsum();
            int a, b;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            ob.sum(a,b);
            Console.ReadLine();
        }
    }
}

6. //program to create a function that takes two integer arguments calculates difference between them

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

namespace ConsoleApplication1
{

    class diff
    {
        public void difftwo(int a, int b)
    {
        int dif;
	    dif=a-b;
	    Console.WriteLine("difference between two numbers is " + dif);
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            diff ob = new diff();
            int a, b;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            ob.difftwo(a, b);
            Console.ReadLine();
        }
    }
}

7. //program to create a function that inputs two numbers and finds their product

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

namespace ConsoleApplication1
{

        class prod
        {
            public void product(int a, int b)
        {
        	    int pro;
	            pro=a*b;
	            Console.WriteLine("product of two numbers is " + pro);
        }
        }
    class Program
    {
        static void Main(string[] args)
        {

            prod ob = new prod();
            int a, b;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            ob.product(a, b);
            Console.ReadLine();
        }
    }
}

8. //program to create a function that takes three integer arguments and calculates their sum

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

namespace ConsoleApplication1
{

    class calcsum
    {
        public void csum(int a, int b, int c)
    {
        	int sum;
	        sum=a+b+c;
	        Console.WriteLine("sum of three numbers is " + sum);
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            calcsum ob = new calcsum();
            int a, b,c;
            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());
            ob.csum(a, b, c);
            Console.ReadLine();
        }
    }
}

9. //program to create a function that takes two integer arguments and finds largest of them

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

namespace ConsoleApplication1
{

    class largest
    {
        public void flarge(int a, int b)
        {
            if(a>b)
	    {
		    Console.WriteLine(a + " is largest of two numbers");
	    }
	    else
	    {
		    Console.WriteLine(b + " is largest of two numbers");
	    }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            largest ob = new largest();           
            int a, b;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            ob.flarge(a, b);
            Console.ReadLine();
        }
    }
}

10. //program to create a function that takes three integer arguments and finds largest of them

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

namespace ConsoleApplication1
{

    class largethree
    {
        public void flarge(int a, int b, int c)
        {
            int max;
	        max=a;
	        if(b>max)
	        {
		        max=b;
	        }
	        if(c>max)
	        {
		        max=c;
	        }
	        Console.WriteLine("largest of three numbers is " + max);
         }
    }
    class Program
    {
        static void Main(string[] args)
        {

            largethree ob = new largethree();
            int a, b, c;
            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());
            ob.flarge(a, b, c);
            Console.ReadLine();
        }
    }
}

11. //program to create a function that takes three integer arguments and finds smallest of them

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

namespace ConsoleApplication1
{


        class smallest
        {
            public void small(int a, int b, int c)
            {
                int min;
	            min=a;
	            if(b<min)
	            {
		            min=b;
	            }
	            if(c<min)
	            {
		            min=c;
	            }
	            Console.WriteLine("smallest of three numbers is " + min);
            }
        }
    class Program
    {
        static void Main(string[] args)
        {

            smallest ob = new smallest();
            int a, b, c;
            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());
            ob.small(a, b, c);
            Console.ReadLine();
        }
    }
}

12. //program to create two functions to calculate area and perimeter of rectangle (length and breadth of rectangle are passed to functions as arguments)

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

namespace ConsoleApplication1
{
            class rectangle
            {
                public void area(int length, int breadth)
                {
	                int ar;
	                ar=length*breadth;
	                Console.WriteLine("area of rectangle is " + ar);
                }
                public void perimeter(int length, int breadth)
                {
	                int per;
	                per=2*(length+breadth);
	                Console.WriteLine("perimeter of rectangle is " + per);
                }
            }
    class Program
    {
        static void Main(string[] args)
        {

            int l, b;
            Console.WriteLine("Enter length of rectangle");
            l = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter breadth of rectangle");
            b = Convert.ToInt32(Console.ReadLine());
            rectangle ob = new rectangle();
            ob.area(l,b);
            ob.perimeter(l,b);
            Console.ReadLine();
        }
    }
}

13. //program to create two functions that find area and circumference of circle (radius of circle is passed to functions as argument)

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

namespace ConsoleApplication1
{
        class circle
        {
            public void area(int radius)
            {
	            float ar;
	            ar=3.14f*radius*radius;
	            Console.WriteLine("area of circle is " + ar);
            }
            public void circumference(int radius)
            {
	            float cir;
	            cir=2*3.14f*radius;
	            Console.WriteLine("circumference of circle is " + cir);
            }
        }
    class Program
    {
        static void Main(string[] args)
        {

            int radius;
            Console.WriteLine("Enter radius");
            radius = Convert.ToInt32(Console.ReadLine());
            circle ob = new circle();
            ob.area(radius);
            ob.circumference(radius);
            Console.ReadLine();
        }
    }
}

14. //program to create two functions to find area and perimeter of square (side of square is passed to functions as argument)

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

namespace ConsoleApplication1
{
    class square
    {
        public void area(int side)
        {
	        int ar;
	        ar=side*side;
	        Console.WriteLine("area of square is " + ar);
        }
                public void perimeter(int side)
        {
	        int per;
	        per=4*side;
	        Console.WriteLine("perimeter of square is " + per);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            int side;
            Console.WriteLine("Enter side of square");
            side = Convert.ToInt32(Console.ReadLine());
            square ob = new square();
            ob.area(side);
            ob.perimeter(side);
            Console.ReadLine();
        }
    }
}

15. //program to create a function that finds volume of a box (width, depth and height of box are passed to function as arguments)

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

namespace ConsoleApplication1
{
    class volumea
    {
        public void volume(int width, int depth, int height)
        {
	        int vol;
	        vol=width*depth*height;
	        Console.WriteLine("volume of box is " + vol);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            int w, d, h;
            Console.WriteLine("Enter Width of box");
            w = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter Depth of box");
            d = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter Height of box");
            h = Convert.ToInt32(Console.ReadLine());
            volumea ob = new volumea();
            ob.volume(w, d, h);
            Console.ReadLine();
        }
    }
}

16. //program to create a function that check whether character passed to it as argument is vowel or not using switch case statement

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

namespace ConsoleApplication1
{
    class chvowel
    {
        public void cvowel(char ch)
    {
        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 entered a vowel");
                break;
	        case 'o':
		        Console.WriteLine("you entered a vowel");
		        break;
	        case 'u':
		        Console.WriteLine("you entered a vowel");
		        break;
	        default:
                Console.WriteLine("please enter a vowel  (a,e,i,o,u)");
                break;
	        }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            chvowel ob=new chvowel();
            char a = 'a';
            ob.cvowel(a);
            Console.ReadLine();
        }
    }
}

17. //program to create a function that calculates sum of numbers between two numbers a and b (a nd b are passed to function as integer arguments )

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

namespace ConsoleApplication1
{
    class sumnumbers
    {
        public void sum(int a, int b)
        {
	        int sum=0;
	        int i;
	        for(i=a;i<=b;i++)
	        {
		        sum=sum+i;
	        }
	        Console.WriteLine("sum of numbers between a and b is " + sum);
        }

    }
    class Program
    {
        static void Main(string[] args)
        {

            int a, b;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            sumnumbers ob = new sumnumbers();
            ob.sum(a,b);
            Console.ReadLine();
        }
    }
}

18. //program to create two functions that prints the three numbers in ascending order and descending order passed to functions as arguments

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

namespace ConsoleApplication1
{
    class ascdesc
    {
        public void asc(int a, int b, int c)
{
	int low,low2,low3;
	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("printing the numbers in ascending order ");
	Console.WriteLine(low+ "," + low2 + "," + low3);
}

        public void desc(int a, int b, int c)
{
	int big,big2,big3;

	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("printing the numbers in descending order ");
	Console.WriteLine(big + "," + big2 + "," + big3);
}

    }
    class Program
    {
        static void Main(string[] args)
        {

            int a, b, c;
            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());
            ascdesc ob = new ascdesc();
            ob.asc(a,b,c);
            ob.desc(a,b,c);
            Console.ReadLine();
        }
    }
}

19. //program to create two functions that prints sum of even numbers and odd numbers between two numbers a and b (a nd b are passed to functions as integer arguments )

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

namespace ConsoleApplication1
{
    class sumevenodd
    {
        public void sumeven(int a, int b)
{
	    int sume=0;
	    int i;
	    for(i=a;i<=b;i++)
	    {
		    if(i%2==0)
		    {
			    sume=sume+i;
		    }
	    }
	    Console.WriteLine("sum of even numbers between a and b is " + sume);
}
        public void sumodd(int a, int b)
        {
	        int sumo=0;
	        int i;
	        for(i=a;i<=b;i++)
	        {
		        if(i%2!=0)
		        {
			        sumo=sumo+i;
		        }
		        }
	        Console.WriteLine("sum of odd numbers between a and b is " + sumo);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            int a, b, c;
            Console.WriteLine("Enter first number");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter second number");
            b = Convert.ToInt32(Console.ReadLine());
            sumevenodd ob = new sumevenodd();
            ob.sumeven(a,b);
            ob.sumodd(a,b);
            Console.ReadLine();
        }
    }
}

20. //program to create a function to calculate simple interest based on principal amount,rate of interest and time (principal,rate and time are passed to functions as arguments, principal and rate are passed as float arguments , time is passed as integer argument )

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

namespace ConsoleApplication1
{
    class si
    {
        public void csi(double principal, double rate, double time)
        {
            double si;
            si = (principal * rate * time) / 100;
            Console.WriteLine("simple interest is " + si);

        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            double p,r,t;
            Console.WriteLine("Enter Principal Amount");
            p=Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Enter Rate of Interest");
            r=Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Enter Time in Years");
            t=Convert.ToDouble(Console.ReadLine());
            si ob=new si();
            ob.csi(p,r,t);
            Console.ReadLine();
        }
    }
}

21. //program to create a function that computes discount based on price entered by the user (price is passed to function as integer argument , if price is greater than or equal to 1000, discount is calculated as 10 percent else 5 percent )

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

namespace ConsoleApplication1
{
    class cdiscount
    {
        public void calcdis(int price)
        {
	        double discount;
	        if(price>=1000)
	        {
		        discount=0.1*price;
	        }
	        else
	        {
		        discount=0.05*price;
	        }
	        Console.WriteLine("discount is " + discount);
}
    }
    class Program
    {
        static void Main(string[] args)
        {

            int p;
            Console.WriteLine("Enter Price");
            p=Convert.ToInt32(Console.ReadLine());
            cdiscount ob = new cdiscount();
            ob.calcdis(p);
            Console.ReadLine();
        }
    }
}

22. //program to create a function that display hello world for a specified number of times

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

namespace ConsoleApplication1
{

    class displayntimes
    {
        public void display(int n)
        {
	        int i;
	        for(i=1;i<=n;i++)
	        {
		        Console.WriteLine("hello world");
	        }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            int a;
            Console.WriteLine("Enter a number");
            a = Convert.ToInt32(Console.ReadLine());
            displayntimes ob = new displayntimes();
            ob.display(a);
            Console.ReadLine();
        }
    }
}

23. //program to create a function that returns factorial of a number passed to it as argument

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

namespace ConsoleApplication1
{
    class cfact
    {
        public int factorial(int n)
        {
            int fact = 1;
            int i;
            for (i = 1; i <= n; i++)
            {
                fact = fact * i;
            }
            return fact;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            cfact ob=new cfact();
            int result;
            result=ob.factorial(5);
            Console.WriteLine("factorial is " + result);
            Console.ReadLine();
        }
    }
}

24. //program to create a function that returns 1 if number passed to it is prime and returns 0 if number passed to it is not prime

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

namespace ConsoleApplication1
{
    class chprime
    {
        public int checkprime(int n)
        {
            int i;
            int prime = 1;
            for (i = 2; i <= n / 2; i++)
            {
                if (n % i == 0)
                {
                    prime = 0;
                    break;
                }
            }
            if (prime == 1)
            {
                return 1;
            }
            else
            {
                return 0;
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            chprime ob=new chprime();
            int result;
            result=ob.checkprime(5);
            if(result==1)
            {
                Console.WriteLine("number is prime");
            }
            else
            {
                Console.WriteLine("number is not prime");
            }
            Console.ReadLine();
        }
    }
}

25. //program to create a function that returns area of circle based on radius passed to function as argument

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

namespace ConsoleApplication1
{
    class cirarea
    {
        public double area(int radius)
        {
            double ar;
            ar = 3.14f * radius * radius;
            return ar;
        }

    }
    class Program
    {
        static void Main(string[] args)
        {

            cirarea ob=new cirarea();
            double result;
            result=ob.area(10);
            Console.WriteLine("area of circle is " + result);
            Console.ReadLine();
        }
    }
}

26. //program to create a function that returns sum of numbers between a and b passed to function as integer arguments

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

namespace ConsoleApplication1
{
    class sumnumbersatb
    {
        public int sum(int a, int b)
        {
            int i;
            int s = 0;
            for (i = a; i <= b; i++)
            {
                s = s + i;
            }
            return s;
        }

    }
    class Program
    {
        static void Main(string[] args)
        {

            sumnumbersatb ob=new sumnumbersatb();
            int result;
            result=ob.sum(5,15);
            Console.WriteLine("Sum of numbers is " + result);
            Console.ReadLine();
        }
    }
}

27. //program to create a function that returns largest of three numbers passed to it as arguments

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

namespace ConsoleApplication1
{
    class findlarge
    {
        public int finlarge(int a, int b, int c)
        {
            int max;
            max = a;
            if (b > max)
            {
                max = b;
            }
            if (c > max)
            {
                max = c;
            }
            return max;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            findlarge ob=new findlarge();
            int result;
            result=ob.finlarge(10,8,9);
            Console.WriteLine("largest of three numbers is " + result);
            Console.ReadLine();
        }
    }
}

28. //program to create a function that returns smallest of three numbers passed to function as integer arguments

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

namespace ConsoleApplication1
{
    class findsmall
    {
        public int finsmall(int a, int b, int c)
        {
            int min;
            min = a;
            if (b < min)
            {
                min = b;
            }
            if (c < min)
            {
                min = c;
            }
            return min;
        }

    }
    class Program
    {
        static void Main(string[] args)
        {

            findsmall ob=new findsmall();
            int result;
            result=ob.finsmall(10,8,9);
            Console.WriteLine("smallest of three numbers is " + result);
            Console.ReadLine();
        }
    }
}

29. //program to create a function that returns volume of box based on width,depth and height passed to function as integer arguments

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

namespace ConsoleApplication1
{
    class volumebox
    {
        public int volume(int width, int depth, int height)
        {
            int vol;
            vol = width * depth * height;
            return vol;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

            volumebox ob=new volumebox();
            int result;
            result=ob.volume(10,20,30);
            Console.WriteLine("volume of box is " + result);
            Console.ReadLine();
        }
    }
}

30. //program to create a function that finds yearly salary based on monthly salary passed to function as integer argument

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

namespace ConsoleApplication1
{
    class salmonthyear
    {
        public void yearly(int monthly)
            {
	            int yearlysalary;
	            yearlysalary=12*monthly;
	            Console.WriteLine("yearly salary is " + yearlysalary);
            }
    }
    class Program
    {
        static void Main(string[] args)
        {

            salmonthyear ob = new salmonthyear();
            ob.yearly(5000);
            Console.ReadLine();
        }
    }
}

31. //program to create a function that calculates compound interest based on principal amount, rate of interest and time passed to the function as arguments

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

namespace ConsoleApplication1
{
    class ci
    {
        public void calccint(double p, double r, double t)
    {
        double ci;
       
        ci=(p*Math.Pow(1+(r/100),t));
        Console.WriteLine("\ncompound interest is " + ci);
    }
    }
    class Program
    {
        static void Main(string[] args)
        {

            ci ob = new ci();
            ob.calccint(1000, 3, 5);
            Console.ReadLine();
        }
    }
}