#include<stdio.h>
int main()
{
    int a,b;        
    
    printf("Please give a number as 1st variable:);      
    scanf("%d",&a);         //get a value for a (Assume 5)
    printf("Please give a number as 2nd variable:);
    scanf("%d",&b);         //get a valur for b (Assume 3)
    
    a=a+b;                  //after assumption, a=8
    b=a-b;                  //b=8-3=5   
    b=a-b;                  //a=8-5=3
    
    printf("The value of the 1st variable:%d",a);
    printf("The value of the 2nd variable:%d",b);
    
    return 0;
}