晓月斋

要求：

• 如果单词中不含元音字母，不做任何翻译．
• 如果单词以元音字母开始，则翻译出的儿童黑话包括原单词加上其后缀way.
• 如果单词以辅音字母开始，提取辅音字符子串直到遇到第一个元音字母，移动收集的辅音字母到单词结尾，然后添加后缀ay.

分析：其主要功能是要找出单词中的元音字母及其下标．

代码如下：

#include <iostream>
#include <string>
#include <cctype>
#include <cstring>

using namespace std;

/*Function Prototypes */
string lineToPigLatin(string line);
string wordToPigLatin(string word);
int findFirstVowel(string word);
bool isVowel(char ch);


/* Main program */
int main(void)
{
    cout << "This program translates English to Pig Latin." << endl;
    string line;
    cout << "Enter English text:";
    getline(cin,line);
    string translation = lineToPigLatin(line);
    cout << "Pig Latin output: " << translation << endl;
    cin.get();
    return 0;
}

/**
 * Function:lineToPigLatin
 * Usage: string translation = lineToPigLatin(line);
 * return: string
 * -------------------------------------------------
 * 2018-9-26
 * */
string lineToPigLatin(string line)
{
    string result;
    int start = -1;
    for(int i = 0;i < line.length();++i)
    {
        char ch = line[i];
        if(isalpha(ch))
        {
            if(start == -1)
            {
                start = i;
            }
        }else{
            if(start >= 0)
            {
                result += wordToPigLatin(line.substr(start,i - start));
                start = -1;
            }
            result += ch; //添加空格
        }
    }
    if (start >= 0)
    {
        result += wordToPigLatin(line.substr(start));
    }
    return result;
}

/**
 * Function: wordToPigLatin
 * Usage: string translation = wordToLatin(word);
 * return: string
 * ----------------------------------------------
 * 2018-9-26
 * */
string wordToPigLatin(string word)
{
    int index = findFirstVowel(word);
    if(index == -1)
    {
        return word;
    }else if(index == 0)
    {
        return word + "way";
    }else
    {
        string head = word.substr(0,index);
        string tail = word.substr(index);
        return tail + head + "ay";
    }
}

/**
 * Function: findFirstVowel
 * Usage: int k = findFirstVowel(word);
 * return: int
 * ------------------------------------
 * return the index position of the first  vowel in word.
 * 2018-9-26
 * */
int findFirstVowel(string word)
{
    for(int i = 0;i < word.length();++i)
    {
        if(isVowel(word[i])) return i;
    }
    return -1;
}

/**
 * Function: isVowel
 * Usage: if (isVowel(ch)) ...
 * return: bool
 * ---------------------------
 * return ture: is vowel;return false: is not vowel
 * 2018-9-26
 * */
bool isVowel(char ch)
{
    char vowel[] = {'a','e','i','o'};
    for(int i = 0;i < strlen(vowel);++i)
    {
        if(vowel[i] == ch) return true;
    }
    return false;    
}

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原文地址：《Ｃ＋＋实现儿童黑话》