Back To C++ Constructors & Destructors
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//program to demonstrate constructor overloading in class student
#include<iostream.h>
#include<conio.h>
#include<string.h>
class student
{
	int rollno;
	char name[20];
	int marks;
	int clas;
public:
	student()   //constructor 1
	{
		rollno=1;
		strcpy(name,"abcdef");
		marks=90;
		clas=11;
	}
	student(int srollno)  //constructor 2
	{
		rollno=srollno;
		strcpy(name,"abcdef");
		marks=90;
		clas=11;
	}
	student(int srollno,char sname[20])    //constructor 3
	{
		rollno=srollno;
		strcpy(name,sname);
		marks=90;
		clas=11;
	}
	student(int srollno,char sname[20],int smarks)   //constructor 4
	{
		rollno=srollno;
		strcpy(name,sname);
		marks=smarks;
		clas=11;
	}
	student(int srollno,char sname[20],int smarks,int sclas) //constructor 5
	{
		rollno=srollno;
		strcpy(name,sname);
		marks=smarks;
		clas=sclas;
	}
	void showdata()
	{
		cout<<"\nrollno is "<<rollno;
		cout<<"\nname is "<<name;
		cout<<"\nmarks are "<<marks;
		cout<<"\nclass is "<<clas;
	}
};
int main()
{
	student ob1;  //constructor 1 called here
	ob1.showdata();
	student ob2(2); //constructor 2 called here
	ob2.showdata();
	student ob3(3,"derdre"); // constructor 3 called here
	ob3.showdata();
	student ob4(4,"abcdef",89); // constructor 4 called here
	ob4.showdata();
	student ob5(5,"xyxyz",90,11);  //constructor 5 called here
	ob5.showdata();
	return 0;
}