WAP that swaps values of two variables with third variable.

Here is you code in C : - 

#include <stdio.h>

int main()
{
    // Intialisation of numbers and third variable
    int n1, n2, temp;
    
    printf("Enter the first number: ");
    
    // Input of 1st variable
    scanf("%d", &n1);
    
    printf("Enter the Second number: ");
    
    // Input of 2nd variable
    scanf("%d", &n2);
    
    printf("The numbers before swap is n1 = %d and n2 = %d \n", n1, n2);
    
    // Below code is for swapping of two variable.
    temp = n1;
    n1 = n2;
    n2 = temp;
    
    printf("The numbers after swap is n1 = %d and n2 = %d", n1 , n2);

    return 0;
}


Output:- 

 


 
Logic behind swap: -
In the code     temp = n1;
                n1 = n2;
                n2 = temp;
                
            let n1 = 10 , n2 = 20;
            
    Here firstly, we will intialize temp(our 3rd variable) equals to 1st then temp = n1 = 10.


    Now, we will use n1 = n2 after which n1 = n2 = 20. Here n1 become equals to 20.


    After that, n2 = temp since, temp = 10 hence, n2 = temp = 10.


    We can see that after this n1 becomes 20 and n2 becomes 10.

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