C++指针

你好 有人能解释为什么第二个 咳嗽 在func(char*p)中不起作用:

#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

using namespace std;

char *strhex(char *str);
char *func(char *p);

int  main()
{
     char *ptr;    

     char *p=strhex("d");
     cout<<"main:"<<p<<endl;

     cout<<func(p)<<endl;

     system("PAUSE");
     return 0;
}

char *func(char *p)
{ 
      cout<<"func1:"<<p<<endl;
      char buffer[500]="";
   char *zbuffer = buffer; 
      cout<<"func2:"<<p<<endl; ///doesn't work

      return zbuffer;
}

char *strhex(char *str)
{
     char buffer[500]="";
  char *pbuffer = buffer;
  int len = strlen( str );

     for( int i = 0; i < len ;i++ )
  {
  itoa(str[i],pbuffer,16);  
        pbuffer +=2;
     };

     *pbuffer = '\0'; 
     pbuffer=buffer;

     return pbuffer;
}

编辑: 我在Windows上使用DEVC+4.4.92.2