#include <stdio.h>
int main()
{
   int A, B, temp;
 
   printf("Please enter the 1st number : ");
   scanf("%d",&A);
   printf("\nPlease enter the 2nd number : ");
   scanf("%d",&B);
 
   printf("\nBefore swapping:\n");
   printf("A - %d \nB - %d", A, B);
   temp = A;
   A = B;
   B = temp;
 
   printf("\nAfter swapping:\n");
   printf("A - %d \nB - %d", A, B);
 
   return 0;
}

OUTPUT :

Please enter the 1st number : 20
Please enter the 2nd number : 30
Before swapping:
A – 20
B – 30
After swapping:
A – 30
B – 20