文件系统：读取，文件不存在则创建

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #define WAY "save.txt"
 4 int main(int argc,int argv[])
 5 {
 6     FILE *fp_read,*fp_write;
 7     
 8     fp_read=fopen(WAY,"r+");
 9     
10     if(fp_read==NULL)
11     {
12         puts("Not exist,create now");
13         fp_write=fopen(WAY,"w+");
14         if(fp_write==NULL)
15             puts("Create failed");
16         else
17         {
18             puts("Create succeed");
19             fputs("good\n",fp_write);            //写入文件：成功时返回非负值, 失败时返回EOF
20             fflush(fp_write);                    //将缓存区内的数据存入文档
21             fp_read=fp_write;
22             fseek(fp_write, 0, SEEK_SET);        //将光标移动到文件结尾：SEEK_END，文件开头：SEEK_SET
23             
24         }
25     }
26     else
27         puts("Open succeed");
28 
29     //打印文件内容
30     rewind(fp_read);                    //将光标移动到文件开头
31     int ch = 0;
32     while((ch=fgetc(fp_read))!=EOF)
33         putchar(ch);
34 
35     system("pause");
36 
37 
38 }