void GetMemory(char *p)
    {
　        p = (char *)malloc(100);
    }

    void main(void)
    {
　        char *str = NULL;
　        GetMemory(str);   
　        strcpy(str, "hello world");
　        printf(str);
    }
我感觉是屏幕上输出：hello world
但不知道是为什么
 谢谢大家！
而且我把这段代码复制到VC上运行不了
#include "stdafx.h"
#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "malloc.h"
void GetMemory(char *p)
    {
　        p = (char *)malloc(100);
    }

    void main(void)
    {
　        char *str = NULL;
　        GetMemory(str);   
　        strcpy(str, "hello world");
　        printf(str);
    }
错误为：
--------------------Configuration: japan - Win32 Debug--------------------
Compiling...
p139.cpp
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(70) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(70) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(75) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(75) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(76) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(76) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(77) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(77) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(78) : error C2018: unknown character '0xa1'
C:\Documents and Settings\Administrator\桌面\新建文件夹 (3)\japan\p139.cpp(78) : error C2018: unknown character '0xa1'
执行 cl.exe 时出错.

japan.exe - 1 error(s), 0 warning(s)

[ 本帖最后由 fz19910125 于 2011-2-15 14:03 编辑 ]

谢谢，我刚学习C语言，许多的东西都不太懂
我想再问一下
void GetMemory(char *p)
{
　        p = (char *)malloc(100);
    }
这是什么意思，我看不懂，这是在C语言的哪一章节能讲到？
我看的是谭浩强的C语言
还有，就是这个程序运行的结果是什么？
谢谢各位了    。。。。

看不懂！