So_long

#include <stdio.h>
int main() {
  FILE* pFile;
  pFile = fopen("unexist.ent", "rb");
  if (pFile == NULL)
    perror("The following error occurred");
  else
    fclose(pFile);
  return 0;
}
/*-----------------------result------------------------*/
/*
	The following error occurred: No such file or directory
*/