#include "stdio.h"
#include "conio.h"



{
    FILE *fo;
    fo=fopen("F:\sun\1.txt","r");
    if(fo==NULL)
    {
        printf("failed to open the file");
    }
    else
    {
        printf("congratulations!");
        fclose(fo);
    }
        getch();
 }******************************************
#include "Stdio.h"
main()
{
     char a[20];
     FILE *fp;
     printf("enter name of file:");
     scanf("%s",a);
     fp=fopen(a,"r");
     if(fp==NULL)
     {
          printf("can't open this file:%s",a);
          exit(0);
     }else
    {
        printf("Congratulations!The file %s is opened!",a);
        fclose(fp);
    }
    getch();
}


这样为什么输入F:\sun\1.txt就没有错误了呢
*************************

谢谢了果然如此，O(∩_∩)O哈哈~，那为什么在命令提示符下输入F：\sun\1.txt就好使了呢

为啥没人回答了呢....