Two's complement test

#include <stdio.h>

int tc(int n){
  // Two's complement function, returns (NOT n) + 1
  return ~n + 1;
}

int main(){
  int i = 5;
  printf("2c(%i) = %i\n", i, tc(i)); // prints "2c(5) = -5"
  return 0;
}