练习：fopen练习，FILE*练习

#include <stdio.h>
#include <windows.h>
int main(void){
 FILE *a;
 a=fopen("C:\\student.txt","r");
 if(!a){
  printf("文件错误！");
 }else{
  printf("文件打开成功！\n");
  system("pause");
 }
 return 0;
}