採用的是vs2019IDE來處理

 1 //按字元讀寫檔案
 2 
 3 #define _CRT_SECURE_NO_WARNINGS
 4 #include<stdio.h>
 5 #include<stdlib.h>
 6 #include<string.h>
 7 //按單個字元寫檔案
 8 int Write_Char_File(FILE* fp)
 9 {
10     fp = fopen("test.txt", "w");
11     if (fp == NULL)
12     {
13         perror("OPEN FILE TEST ERROR:
 
");
14         printf("\n");
15         return -1;
16     }
17     //寫26個英語字元放到檔案當中
18     for (int i = 97; i < 123; i++)
19     {
20         char a = i;
21         fputc(a, fp);
22     }
23     fclose(fp);
24     return 0;
25 }
26 
27 //按單個字元讀檔案
28 int Get_Char_File(FILE* fp)
29 {
30     fp = fopen("D:/C_sum/test.txt
 
", "r+");
31     if (fp == NULL)
32     {
33         perror("FUCK:");
34         printf("\n");
35         return -1;
36     }
37     char a;
38     while (1)
39     {
40         a = fgetc(fp);
41         if (a == EOF)
42         {
43             break;
44         }
45         else
46         {
47             putchar(a);
 
48         }
49     }
50     return 0;
51     fclose(fp);
52 }
53 
54 //利用函式feof來判斷是否將檔案內容讀取完
55 void Feof_Get_Char_File(FILE* fp)
56 {
57     fp = fopen("D:/C_sum/test.txt", "r");
58     if (fp == NULL)
59     {
60         perror("open file error:");
61         printf("\n");
62         return;
63     }
64     while (1)
65     {
66         char ch;
67         ch = fgetc(fp);
68         if (feof(fp))
69         {
70             printf("讀取完畢\n");
71             break;
72         }
73         else
74         {
75             printf("%c",ch);
76         }
77     }
78     fclose(fp);
79 }
80 
81 int main()
82 {
83     FILE* fp = NULL;
84     Feof_Get_Char_File(fp);
85     return 0;
86 }