Program to Demonstrating assertions in C

#undef NDEBUG 
#include 
#include 
int main(void)
{
  int y = 5;
  for(int x = 0 ; x < 20 ; x++)
  {
    printf("\nx = %d   y = %d", x, y);
    assert(x<=y);
  }
  return 0;
}