#include <stdio.h>
#include <stdlib.h>

double sub(int x) {
  return x;         // conversion to return type
}

int main(int argc, char *argv[]) {
  int i = 2.0;      // conversion on initialization
  double d = 2.0;
  d = i + d;        // conversion on operator (+): i -> double
  i = sub(d);       // conversion of argument on call
                    // conversion of result on assignment
  printf("%d\n", i);// prints 4
  
  return EXIT_SUCCESS;
}