fopenプロジェクト - bg1wiki @ ウィキ

fopen.c

#include <stdio.h>
 
int main(void){
 
  FILE *fp;
 
  fp = fopen("test.txt", "r");
 
  if (fp == NULL){
    printf("Can't open file!\n");
    return -1;
  }
 
  printf("Open file succeed!\n");
 
  fclose(fp);
 
  return 0;
 
}