【算法】单词翻转

////  main.cpp//  Sort////  Created by scuhmz on 4/29/15.//  Copyright (c) 2015 com.nwpu.hmz. All rights reserved.//#include <iostream>char* ReverseStr (char* s,int from,int to){    while (from < to) {        char t = s[from];        s[from++] = s[to];        s[to--] = t;    }    return s;}char* ShiftStr(char* s){    int length = (int)strlen(s);    char * re = ReverseStr(s, 0, length-1);    int left = 0;    int right  = 0;    while (right<length) {        right++;        if (re[right] == ' '||re[right]=='\0') {            re = ReverseStr(re , left, right-1);            left = right+1;        }    }    return re;}int main(int argc, const char * argv[]) {        char test[] = "i am a student.";    ShiftStr(test);    printf("%s\n",test);    return 0;    }