text: #include <stdio.h>
  #include <stdlib.h>
  
  void foo(FILE *f) { fclose(f); }
  
  int main(int argc, char **argv) {
    FILE *f;
  
    int z;
  
    if (feof(f) != 0)
      z = 30;
    else
      z = 20;
  
    f = fopen(argv[1], "r");
  
    foo(f);
  
    return 0;
  }