C语言 文件的读写操作

//凯鲁嘎吉 - 博客园 http://www.cnblogs.com/kailugaji/

 #include<stdio.h>
 #include<stdlib.h>
 void main(){
     int a;
     void write();
     void read();
     while(){
         printf("*****************\n");
         printf("1.write\n");
         printf("2.read\n");
         printf("0.exit\n");
         printf("*****************\n");
         printf("Please choose:");
         scanf("%d",&a);
         if(a==){
             exit();
         }
         else if(a==){
             write();
         }
         else if(a==){
             read();
         }
         else
             printf("input error!\nPlease choose:");
     }  

 }

 void write(){
     FILE *fp;
     char ch,filename[];
     printf("Please input the filename you want to write:");
     scanf("%s",filename);
     if(!(fp=fopen(filename,"wt+"))){
         printf("Cannot open the file!\n");
         exit();
     }

     printf("Please input the sentences you want to write:");
     ch=getchar();
     ch=getchar();
     while(ch!=EOF){  //EOF: Ctrl+z
         fputc(ch,fp);
         ch=getchar();
     }

     fclose(fp);

 }

 void read(){
     FILE *fp;
     char ch,filename[];
     printf("Please input the filename you want to read:");
     scanf("%s",filename);
     if(!(fp=fopen(filename,"r"))){
         printf("Cannot open the file!\n");
         exit();
     }

     printf("%s 的内容为:",filename);
     while(ch!=EOF){  //EOF(end of file): Ctrl+z
         ch=fgetc(fp);
         putchar(ch);
     }

     fclose(fp);
 }

程序运行前的当前目录：

程序运行结果：

当前目录多了一个文件wrr.txt

打开该文件：

里面已经有了刚刚输入的内容：

Hello world!
I am RONGRONG WANG!
My English name is Kailugaji!
Thank you!