C++ Program to Swap two numbers:

Algorithm:

START
   Var1, Var2, Temp
   Step 1  Copy value of Var1 to Temp
   Step 2  Copy value of Var2 to Var1
   Step 3  Copy value of Temp to Var2
STOP

Code:

#include<iostream>           //include libraries

using namespace std;

int main()

{

    int a,b;                            // take 2 var

    cout<<"before swapping"<<endl;            //display values before swap

cout<<"a =";

cin>>a;

cout<<"b =";

cin>>b;

a=a+b;                                        //procedure to swap

b=a-b;

a=a-b;

cout<<"After swapping";               //display values after swap

cout<<"a="<<a<<endl;

cout<<"b="<<b<<endl;

system("pause");

return 0;

}

Output: