C++ program to overload ++ increment operator for vectors using friend function.

#include<iostream.h>
#include<conio.h>
class vector{
float x,y,z;
public:
vector(){
x=y=z=0;
}
vector(float x1,float y1,float z1){
x=x1;
y=y1;
z=z1;
}
void display(){
cout<<"( "<<x<<")i+ ("<<y<<")j+("<<z<<")k"<<endl;
}
friend void operator++(vector &v);
};
void operator++(vector &v){
v.x=++v.x;
v.y=++v.y;

v.z=++v.z;
}
void main(){
vector v1(3,7);
clrscr();
v1.display();
++v1;
v1.display();
getch();
}