JZ-C-42

剑指offer第四十二题：翻转单词顺序：输入一个英文句子，翻转句子中单词的顺序，但单词内字符的顺序不变

//============================================================================
// Name        : JZ-C-42.cpp
// Author      : Laughing_Lz
// Version     :
// Copyright   : All Right Reserved
// Description : 翻转单词顺序：输入一个英文句子，翻转句子中单词的顺序，但单词内字符的顺序不变
//============================================================================

#include <iostream>
#include <stdio.h>
#include "StringUtil.h"
#include <string.h>
using namespace std;

char* ReverseSentence(char *pData) {
    if (pData == NULL)
        return NULL;

    char *pBegin = pData;

    char *pEnd = pData;
    while (*pEnd != '')
        pEnd++;
    pEnd--;

    // 翻转整个句子
    Reverse(pBegin, pEnd);

    // 翻转句子中的每个单词
    pBegin = pEnd = pData;
    while (*pBegin != '') {
        if (*pBegin == ' ') {
            pBegin++;
            pEnd++;
        } else if (*pEnd == ' ' || *pEnd == '') {
            Reverse(pBegin, --pEnd);
            pBegin = ++pEnd;
        } else {
            pEnd++;
        }
    }

    return pData;
}

// ====================测试代码====================
void Test(char* testName, char* input, char* expectedResult) {
    if (testName != NULL)
        printf("%s begins: ", testName);

    ReverseSentence(input);

    if ((input == NULL && expectedResult == NULL)
            || (input != NULL && strcmp(input, expectedResult) == 0))
        printf("Passed.

");
    else
        printf("Failed.

");
}

// 功能测试，句子中有多个单词
void Test1() {
    char input[] = "I am a student.";
    char expected[] = "student. a am I";

    Test("Test1", input, expected);
}

// 功能测试，句子中只有一个单词
void Test2() {
    char input[] = "Wonderful";
    char expected[] = "Wonderful";

    Test("Test2", input, expected);
}

// 鲁棒性测试
void Test3() {
    Test("Test3", NULL, NULL);
}

// 边界值测试，测试空字符串
void Test4() {
    Test("Test4", "", "");
}

// 边界值测试，字符串中只有空格
void Test5() {
    char input[] = "   ";
    char expected[] = "   ";
    Test("Test5", input, expected);
}

int main(int argc, char** argv) {
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();

    return 0;
}