Question

swap two numbers without using third variable

Answer 1

#include<iostream.h>
#include<conio.h>
{clrscr();
int a,b;
cout<<"enter 2 numbers";
cin>>a>>b;
a=a+b;
b=a-b;
a=a-b;
cout<<"/n after swapping value of a="<<a;
cout<<"/n after swapping value of b="<<b;
getch();
}

Answer 2

Answer:

#include<iostream>

using namespace std;

int main()

{

int x, y, t;

cin>>x>>y;

cout<<"Before swapping"<<" "<<"a= "<<x<<" " <<"and"<<" "<<"b="<<y<<"\n";

t = x;

x = y;

y = t;

cout<<"After swapping"<<" "<<"a= "<<x<<" "<<"and"<<" "<<"b="<<y;

return 0;

}

Explanation: