C语言 文件的读写操作

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 void main(){
 4     int a;
 5     void write();
 6     void read();
 7     while(1){
 8         printf("*****************\n");
 9         printf("1.write\n");
10         printf("2.read\n");
11         printf("0.exit\n");
12         printf("*****************\n");
13         printf("Please choose:");
14         scanf("%d",&a);
15         if(a==0){
16             exit(0);
17         }
18         else if(a==1){
19             write();
20         }
21         else if(a==2){
22             read();
23         }
24         else
25             printf("input error!\nPlease choose:");
26     }  
27     
28 }
29 
30 void write(){
31     FILE *fp;
32     char ch,filename[20];
33     printf("Please input the filename you want to write:");
34     scanf("%s",filename);
35     if(!(fp=fopen(filename,"wt+"))){
36         printf("Cannot open the file!\n");
37         exit(0);
38     }
39     
40     printf("Please input the sentences you want to write:");
41     ch=getchar();
42     ch=getchar();
43     while(ch!=EOF){  //EOF: Ctrl+z
44         fputc(ch,fp);
45         ch=getchar();
46     }
47     
48     fclose(fp);
49     
50 }
51 
52 void read(){
53     FILE *fp;
54     char ch,filename[20];
55     printf("Please input the filename you want to read:");
56     scanf("%s",filename);
57     if(!(fp=fopen(filename,"r"))){
58         printf("Cannot open the file!\n");
59         exit(0);
60     }
61     
62     printf("%s 的内容为:",filename);
63     while(ch!=EOF){  //EOF(end of file): Ctrl+z
64         ch=fgetc(fp);
65         putchar(ch);
66     }
67     
68     fclose(fp);
69 }