为何众教材都不以此解释虚函数

程序如下：

#include <stdio.h>　　　　　　　　　　　
int main()
{
　printf(“Hello World. ”);
　exit(0);
}

编译信息如下：
jack@jack-desktop:~$ gcc -o bc bc.c
bc.c:1:17: warning: extra tokens at end of #include directive
bc.c:1:50: error: stdio: No such file or directory
bc.c:2: error: stray ‘\343’ in program
bc.c:2: error: stray ‘\200’ in program
bc.c:2: error: stray ‘\200’ in program
bc.c:2: error: stray ‘\343’ in program
bc.c:2: error: stray ‘\200’ in program
bc.c:2: error: stray ‘\200’ in program
bc.c:3: error: stray ‘\343’ in program
bc.c:3: error: stray ‘\200’ in program
bc.c:3: error: stray ‘\200’ in program
bc.c:3: error: stray ‘\343’ in program
bc.c:3: error: stray ‘\200’ in program
bc.c:3: error: stray ‘\200’ in program
bc.c:4: error: stray ‘\343’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c:4: error: stray ‘\343’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c: In function ‘main’:
bc.c:5: error: stray ‘\343’ in program
bc.c:5: error: stray ‘\200’ in program
bc.c:5: error: stray ‘\200’ in program
bc.c:5: error: stray ‘\343’ in program
bc.c:5: error: stray ‘\200’ in program
bc.c:5: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\343’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\343’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: warning: incompatible implicit declaration of built-in function ‘printf’
bc.c:6: error: stray ‘\342’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\234’ in program
bc.c:6: error: ‘Hello’ undeclared (first use in this function)
bc.c:6: error: (Each undeclared identifier is reported only once
bc.c:6: error: for each function it appears in.)
bc.c:6: error: expected ‘)’ before ‘World’
bc.c:6: error: stray ‘\342’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\235’ in program
bc.c:6: error: stray ‘\343’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\343’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: stray ‘\200’ in program
bc.c:6: error: expected expression before ‘>>’ token
bc.c:6: error: stray ‘\347’ in program
bc.c:6: error: stray ‘\216’ in program
bc.c:6: error: stray ‘\257’ in program
bc.c:6: error: stray ‘\345’ in program
bc.c:6: error: stray ‘\242’ in program
bc.c:6: error: stray ‘\203’ in program
bc.c:6: error: stray ‘\344’ in program
bc.c:6: error: stray ‘\270’ in program
bc.c:6: error: stray ‘\213’ in program
bc.c:6: error: stray ‘\357’ in program
bc.c:6: error: stray ‘\274’ in program
bc.c:6: error: stray ‘\214’ in program
bc.c:6: error: stray ‘\346’ in program
bc.c:6: error: stray ‘\214’ in program
bc.c:6: error: stray ‘\211’ in program
bc.c:6: error: stray ‘\344’ in program
bc.c:6: error: stray ‘\270’ in program
bc.c:6: error: stray ‘\213’ in program
bc.c:6: error: stray ‘\351’ in program
bc.c:6: error: stray ‘\224’ in program
bc.c:6: error: stray ‘\256’ in program
bc.c:6: error: stray ‘\357’ in program
bc.c:6: error: stray ‘\274’ in program
bc.c:6: error: stray ‘\214’ in program
bc.c:6: error: stray ‘\346’ in program
bc.c:6: error: stray ‘\234’ in program
bc.c:6: error: stray ‘\211’ in program
bc.c:6: error: stray ‘\350’ in program
bc.c:6: error: stray ‘\207’ in program
bc.c:6: error: stray ‘\252’ in program
bc.c:6: error: stray ‘\345’ in program
bc.c:6: error: stray ‘\212’ in program
bc.c:6: error: stray ‘\250’ in program
bc.c:6: error: stray ‘\347’ in program
bc.c:6: error: stray ‘\274’ in program
bc.c:6: error: stray ‘\251’ in program
bc.c:6: error: stray ‘\350’ in program
bc.c:6: error: stray ‘\277’ in program
bc.c:6: error: stray ‘\233’ in program
bc.c:6: error: stray ‘\345’ in program
bc.c:6: error: stray ‘\212’ in program
bc.c:6: error: stray ‘\237’ in program
bc.c:6: error: stray ‘\350’ in program
bc.c:6: error: stray ‘\203’ in program
bc.c:6: error: stray ‘\275’ in program
bc.c:7: error: stray ‘\343’ in program
bc.c:7: error: stray ‘\200’ in program
bc.c:7: error: stray ‘\200’ in program
bc.c:7: error: stray ‘\343’ in program
bc.c:7: error: stray ‘\200’ in program
bc.c:7: error: stray ‘\200’ in program
bc.c:8: error: stray ‘\343’ in program
bc.c:8: error: stray ‘\200’ in program
bc.c:8: error: stray ‘\200’ in program
bc.c:8: error: stray ‘\343’ in program
bc.c:8: error: stray ‘\200’ in program
bc.c:8: error: stray ‘\200’ in program
bc.c:9: error: stray ‘\343’ in program
bc.c:9: error: stray ‘\200’ in program
bc.c:9: error: stray ‘\200’ in program
bc.c:9: error: stray ‘\343’ in program
bc.c:9: error: stray ‘\200’ in program
bc.c:9: error: stray ‘\200’ in program
bc.c:10: error: stray ‘\343’ in program
bc.c:10: error: stray ‘\200’ in program
bc.c:10: error: stray ‘\200’ in program
bc.c:10: error: stray ‘\343’ in program
bc.c:10: error: stray ‘\200’ in program
bc.c:10: error: stray ‘\200’ in program

那位高手帮帮忙！

最后由 brucechou 编辑于 2007-04-10 21:49，总共编辑了 2 次

1.stdio.h
2.把你的全角空格统统去掉
3.引号用英文的
4.谁教你这样注释的..

不好意思刚刚发帖是输入错了。
我重新改了代码：
#include <stdio.h>　　　　　　　　　　　
int main()
{
　printf(“Hello World. ”);
　exit(0);
}
编译是输出如下错误：
bc.c:1:19: warning: extra tokens at end of #include directive
bc.c:1:52: error: stdio.h: No such file or directory
bc.c: In function ‘main’:
bc.c:4: error: stray ‘\343’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c:4: error: stray ‘\200’ in program
bc.c:4: warning: incompatible implicit declaration of built-in function ‘printf’

先装好编译环境再说

<stdio.h>后面一堆全角空格
引号用英文,不要用中文引号

将exit(0);改为return 0;

建议学C／C＋＋者也同时补一下英文，不用精通，但是最少能够通过查字典能够看明白错误报告。

要用exit(0)的话，就要
#inlcude <stdlib.h>

stdio.h找不到估计你要把libc-dev给装上
你试试把这些内容给复制粘贴到一个文本文件里面，然后再编译它：

谢谢 这才是正解阿

害死人，
把空格的部分去掉，重新加上TAB就好。

请问怎么安装编译环境呢？

你是不是从网页上嗖的直接粘上去的啊？有些空格什么的会报错的