Interchange or exchange the values of two variables.

#include <stdio.h>

int main(void)
{
int m, n, temp;

printf( "\nEnter values for m, n : " );
scanf("%d%d", &m, &n);

printf( "\nBefore swap : m = %d n = %d", m, n);

temp = m;
m = n;
n = temp;

printf( "\nAfter swap : m = %d n = %d", m, n);

return 0;
}