Modifying bit positions of an integer

bit.cc

#include <stdio.h>

#define BIT(x) (0x1 << x)

int set(int val, int pos)
{
  return (val |= BIT(pos));
}

int unset(int val, int pos)
{
  return (val &= ~BIT(pos));
}

// Examples to test
int main()
{
  printf("%d\n", set(1, 3));
  printf("%d\n", set(5, 3));
}