simple value swapping using C pointers

#include <stdio.h>
#include <math.h>

void swapThem(int *a, int *b) {
  int aux = *b;
  *b = *a;
  *a = aux;
}

int main(int argc, char const *argv[]) {
    int a = 2;
    int b = 5;

    printf("Before: a is %d b is %d\n", a, b);
    swapThem(&a, &b);
    printf("After: a is %d b is %d\n", a, b);
}