Swaping in c

/* Interchange between two integer */

#include <stdio.h>

int main() 

{

   int a = 23, b = 47;

   int t;

    printf("Before. a: %d, b: %d\n", a, b);

     t = a;

     a = b;

     b = t;

    printf("After.  a: %d, b: %d\n", a, b);

   return 0;

}