C++ program to swap two variable using 3rd variable

In this chapter of C++ program tutorial out task is: 

• Write a C++ program to swap two variable using third variable.

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C++ program to swap two variable using 3rd variable

Below is the C++ program to swap two variable using the 3rd variable.

#include<iostream>
using namespace std;
int main()
{
    int a,b,temp=0;
    cout<<"Enter the two variable"<<endl;
    cin>>a>>b;
    cout<<"Value before swapping"<<endl; 
    cout<<"a = "<<a<<"\t"<<"b = "<<b<<endl;
    temp = a;    
    a = b;       
    b = temp;     
    cout<<"Value after swapping"<<endl;
    cout<<"a = "<<a<<"\t"<<"b = "<<b<<endl;
    return 0;
}

OUTPUT :

• The execution starts from the main function (here int main()).
• Then a 4 bit each for the three integers are created (assuming the system to be 64 bit).
• Then the compiler accepts the two variable as the input.
• Then the value of ("a") is stored in the temporary variable ("temp").
• Then the previously value of ("a") is replaced by the new value of ("b").
• Then the previous value of ("b") is replaced by the value of ("temp") which was actually the value of ("a") that was previously stored.
• Then the number get swapped by the help of third value
• The program than gives the desired output and terminates in the line "return 0" returning a 0 value.

WORKING :

a = 10 , b = 20

temp = a      ( temp = 10 )

a = b            ( a = 20)

b = temp      ( b = 10)

So, a = 20 and b = 10

 

You can see the above code execution and output in codeblocks IDE: