直接复制书上的代码执行得到的却是不停的乱码，完全不是书上说的输出内容。

这是书上原文复制：

Program P6.11
//This program prints the data from a file numbering the lines
#include <stdio.h>
int main() {
 char ch;
 FILE *in = fopen("input.txt", "r");
 int lineNo = 1;
 printf("%2d. ", lineNo);
 while ((ch = getc(in)) != EOF) {
 putchar(ch);
 if (ch == '\n') {
 lineNo++;
 printf("%2d. ", lineNo);
 }
 }
 fclose(in);
}

Assume the input file contains the following:

There was a little girl
 Who had a little curl
Right in the middle of her forehead

Program P6.11 will print this:

1. There was a little girl
2. Who had a little curl
3. Right in the middle of her forehead
4.

[此贴子已经被作者于2019-10-3 23:39编辑过]

把input.txt保存为ansi字符集

用Windows平台保存成ANSI编码了，用Android的 C4droid 运行还是一样不停的输出一个菱形里面一个问号的符号

我百度EOF，用！feof (in) 解决了这个问题。跟文件编码没有任何关系，纯粹是EOF本身的问题，书的作者是个印度阿三，也是真厉害，自己的代码都不带测试就直接写出来！