1 #include <stdio.h>
2 /***************************
3 * 头文件:#include <stdio.h>
4 * 函数:int fseek(FILE *stream, long offset, int whence);
5 * 功能:重定向我们的文件操作位置
6 * 参数:
7 * stream 前面打开的流地址
8 * offset 向前移动填负数,向后移动填正数,0
9 * whence SEEK_SET(开始位置), SEEK_CUR（当前位置）, SEEK_END(末尾位置)
10 * 返回值:
11 * 成功:返回０
12 * 失败:返回ＥＯＦ(-1)
13 * *************************/
14 int main()
15 {
16 FILE *fp = NULL;
17 fp = fopen("test.txt","w+");
18 if(fp == NULL)
19 {
20 printf("打开文件失败:\n");
21 return -1;
22 }
23
24 printf("打开文件成功:\n");
25
26 fprintf(fp,"%s %s %s %d %s\n","小明","吃饭","睡觉",2021,"打豆豆");
27 //写完后想读前面内容
28 fseek(fp,0,SEEK_SET);
29
30 char name[20] = "";
31 int yer = 0;
32 char movement_1[20] = "";
33 char movement_2[20] = "";
34 char movement_3[20] = "";
35
36 fscanf(fp,"%s %s %s %d %s\n",name,movement_1,movement_2,&yer,movement_3);
37 printf("%s %s %s %d %s\n",name,movement_1,movement_2,yer,movement_3);
38
39
40 if(fclose(fp) == EOF )
41 {
42 printf("关闭失败\n");
43 }
44 else
45 {
46 printf("关闭成功\n");
47 }
48
49 return 0;
50 }
