Rocket science

gistfile1.c

#include <stdio.h>

double recip(int denom)
{
  return 1.0/(double) denom;
}

void do_nothing() {}

int main(int argc, char const *argv[])
{
  double r1, r2;
  int t1, t2;
  int denom = 10;

  r1 = recip(denom);
  r2 = recip(denom);
  t1 = r1 == r2;
  do_nothing();
  t2 = r1 == r2;
  printf("test1 t1: r1 %f %c= r2 %f\n", r1, t1 ? '=' : '!', r2);
  printf("test2 t2: r1 %f %c= r2 %f\n", r1, t2 ? '=' : '!', r2);

  return 0;
}