编写一个公司的面试题问题

将字符串当中的单词，按照句子的倒序输出。

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

#include "stdafx.h"
#include "malloc.h"


// 2013-10-2 12:02:32 @sonikk neteasy
// calc the length of string (char*)
// implement strlen()
int slen(char * str)
{
	int n = 0;

	while( *(str++) != '\0')
		n++;

	return n;
}

void inverseStr(char * str, int len, int start, int end)
{
	//printf("str=%s, len=%d", str, len);

	int sublen = end - start + 1;

	char temp;
	for(int i=0; i<sublen/2; i++)
	{
		temp = str[start + i];
		str[start + i] = str[end - i];
		str[end - i] = temp;
	}
	
}

void inverseWords(char * str)
{
	int len = slen(str);
	int start = 0;
	int end = 0;

	// inverseAll
	inverseStr(str, len, 0, len-1);

	// maerd a evah I ->
	for(int i=0; i < len; i++)
	{
		if(str[i+1] == ' ' || i == len - 1)
		{
			end = i;
			inverseStr(str, len, start, end);
			int k = i + 1;
			while( k<len && str[k] == ' ')  // k < len && 
			{
				k++;
			}
			start = k;
		}
	}

}


char* mystrcpy(char* str)
{

	int len = strlen(str);
	char* buf = (char*)malloc( len + 1 );

	for(int i=0; i<len; i++)
	{
		buf[i] = str[i];
	}
	buf[len] = '\0';

	return buf;
}

int _tmain(int argc, _TCHAR* argv[])
{

	char* buf0 = "I have a dream"; // 字符串常量(只读)

	//char buf[] = "I have a dream"; // 字符串变量

	char* buf = mystrcpy(buf0); // 可读可写

	// "I have a dream"
	printf("[1] buf = %s\n", buf);

	inverseWords( buf );

	// "dream a have I"
	printf("[2] buf = %s\n", buf);

	getchar();


	return 0;
}