反转一个字符串

// strReverse.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string.h>
//、反转一个字符串。
void swap(char& a,char& b)
{
	char tmp;
	tmp=a;
	a=b;
	b=tmp;
}
void reverse( char * str)
{
//char tmp;
int len;
len = strlen(str);
for ( int i = 0 ;i < len / 2 ; ++ i)
{
	//tmp = char [i];
	//str[i] = str[len - i - 1 ];
	//str[len - i - 1 ] = tmp;
	swap(str[i],str[len - i - 1 ]);
}
}

int main(int argc, char* argv[])
{
	char null[]="";
	reverse(null);
	printf("reverse(null):%s\n",null);
	char a[]="A";
	reverse(a);
	printf("reverse(a):%s\n",a);
	char b[]="AB";
	reverse(b);
	printf("reverse(b):%s\n",b);
	char c[]="ABC";
	reverse(c);
	printf("reverse(c):%s\n",c);
	char d[]="ABCD";
	reverse(d);
	printf("reverse(d):%s\n",d);
	printf("Hello World!\n");
	return 0;
}

/*
reverse(null):
reverse(a):A
reverse(b):BA
reverse(c):CBA
reverse(d):DCBA
Hello World!
Press any key to continue
*/