C++ program to overload the unary minus operator using friend function.

Write a program to overload the unary minus operator using friend function.

#include<iostream>

using namespace std;

class space{

  int x;

  int y;

  int z;

  public:

    void getdata(int a,int b,int c);

    void display(void);

    friend void operator-(space &s);

};

void space :: getdata(int a,int b,int c){

  x=a;

  y=b;

  z=c;

}

void space :: display(void){

  cout<<x<<" ";

  cout<<y<<" ";

  cout<<z<<"\n";

}

void operator-( space &s){

  s.x=-s.x;

  s.y=-s.y;

  s.z=-s.z;

}

int main(){

  space s;

  s.getdata(10,-20,30);

  cout<<"S : ";

  s.display();

  -s;

  cout<<"S :";

  s.display();

  return 0;

}

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