在字符串的開頭找到元音和大寫char？

Question

我一直在做一個小記憶遊戲作爲練習從我正在做的教科書。這叫做奶奶的後備箱，一回合就可以找到一個物品在後備箱中，下一回合你說你在這個回合中找到了前一個物品和最新的物品......我想。

大部分這是一個使用函數的練習，我認爲我已經很好地完成了。但是我的輸出是完全錯誤的。我相信我已經找到了一個函數的問題，我應該分析第一個字符，並決定它是否需要AN或A或THE之前的字符串。我用來從小型數據庫中引入預定義項目的隨機函數可能存在問題。 int main（）函數應該是相對完整的，這只是一個練習來掌握函數......我是這樣做的？寧可稱之爲新手體驗。

我以爲也許我遇到了getline bug，它會在空白處填上一個空行，並且從我的理解中，它是由cin.ignore（）修復的;但是我輸入數據時所做的只是強迫我輸入兩次。哪個...我有點喜歡。也許我使用像isupper和.at（）這樣的gizmos是錯誤的？我嘗試使用find_first_of，但它並沒有真正改變任何東西。

輸出調用存儲幹線和所有者奶奶，只是使用word1 word2 word3 ... wordn ....作爲項目發現留給我的輸出。

In grandma trunk you've found a 
and an ord3 word1. 

它完全混淆輸出。我開始認爲我給出的int main（）體不完全是恆星。但是我不能對我的文章功能充滿信心。任何幫助都會令人難以置信。在許多書籍和朋友的建議中，我一直在努力使用它來教我一些關於編程的知識。這是一個非常頭痛的問題。

程序本身

#include <iostream> 
#include <string> 
#include <stdlib.h> 
#include <time.h> 
#include <ctype.h> 
using namespace std; 

string CorrectArticle(string phrase); 

string GetPhrase(void); 

bool Continue(void); 

string UpperCase(string); 

string RandomItem(void); 

const string PUNCTUATION = "."; 

int main(){ 
    //Variables 

    int turn; 
    bool flag; 
    string phrase, 
     article, 
     story, item, 
     storage, owner; 

    srand(time(NULL)); 

    cout << "Welcome to Grandmother's Trunk 9000" << endl; 
    cout << "This is a memory game. Each turn a player" << endl; 
    cout << "Says an item to place inside a trunk. " << endl; 
    cout << "And the next player has to say what the " << endl; 
    cout << "previous player said plus his/her own item." << endl; 
    cout << "This will go around in revolving turns." << endl; 

    cout << endl << endl; 

    cout << "But Grandma's Trunk is a little dry..." << endl; 
    cout << "Let's change what the storage is and " << endl; 
    cout << "Who owns it." << endl << endl; 
    //define storage variable 
    cout << "What exactly is this storage?" << endl; 
    getline (cin, storage); 

    cout << "So the items are stored in " << storage << endl; 
    cout << endl; 
    //define owner 
    cout << "Who owns this " << storage << " ?" << endl; 
    getline (cin, owner); 

    cout << "The owner is " << owner << endl; 

    story = "In "+ owner + " " + storage + " you've found "; 

    turn = 0; 
    flag = Continue(); 


    //While flag is true 
    while (flag) { 
     if (turn %2 == 0) { 
      item = GetPhrase(); 
     } else { 
      item = RandomItem(); 
     } 

     //set corrected item to article 
     article = CorrectArticle(item); 

     //advance the story every item 
     story = story + "\n and " + article + " " + item; 
     cout << story << PUNCTUATION << endl; 
     turn++; 
     flag = Continue(); 
    } 

    return (0); 
} 





//Gives A, AN, and THE to correct words 
// An if phrase starts with i,e,i,o,u or y 
// A if phrase starts with other lower case letters 
// The for phrases that start with an uppercase letter 
string CorrectArticle(string phrase){ 

int i=0; 

string correctedString; 

string stringAn; 
string stringA; 
string stringThe; 

stringAn= " an "; 
stringA = " a "; 
stringThe= "The "; 

if (GetPhrase().at(i) = "a" or "e" or "i" or "u"){ 

    correctedString = stringAn + GetPhrase(); 

}else if (isupper(GetPhrase().at(i))){ 

    correctedString = stringThe + GetPhrase(); 

}else{ 
    correctedString = stringA + GetPhrase(); 
} 

return correctedString; 

} 




//This function takes no parameters 
//and returns the user's input 
string GetPhrase(void){ 

    string itemInput; 
    cout << "\nWhat did you find? \n" << endl; 
    getline (cin, itemInput); 

    cout << "\nYou found " << itemInput << endl; 
    cin.ignore(); 
    return itemInput; 
} 





//Asks user if they wish to continue 
bool Continue(void){ 
//return false if no, true if yes 
    string continueString; 

    cout << "Would you like to continue?"; 
    cout << " Yes or No would suffice" << endl; 
    getline(cin,continueString); 

    UpperCase(continueString); 
    cout << "You picked " << continueString; 

    if (UpperCase(continueString).find("NO") != string::npos){ 
     return false; 
    } else if (UpperCase(continueString).find("YES") != string::npos){ 
     return true; 
    } 
} 

//Changes the string to uppercase 
string UpperCase(string stringUpper){ 
    int i = 0; 

     while (i<stringUpper.size()){ 
     stringUpper[i] = toupper(stringUpper[i]); 
     i++; 
     } 
    return stringUpper; 
} 


//Randomizes items found in game 
string RandomItem(void){ 
    int randomNumber; 
    int maxNumberOfItems = 5; 

    string randomizedItem; 

    randomNumber= rand() % maxNumberOfItems; 

    switch (randomNumber){ 
     case 0: 
     randomizedItem = "Smaug"; 
     break; 
     case 1: 
     randomizedItem = "Batman"; 
     break; 
     case 2: 
     randomizedItem = "Yoda"; 
     break; 
     case 3: 
     randomizedItem = "Paul Atreides"; 
     break; 
     case 4: 
     randomizedItem = "Captain Kirk"; 
     break; 
     default: 
     cout << "ERRORRRR! PANIC!" << endl; 
    } 
return randomizedItem; 
} 

Answer 1

記住=是分配，==的比較。

還記得，你要比較變量與價值，如：

if ((string == "a") or (string == "e") ... 

如果or爲你工作一切順利。我只能使用||。必須是編譯器符合性問題。

試試這個：

bool is_vowel(char letter) 
{ 
    const std::string vowels("aeiouAEIOU"); 
    return (vowels.find_first(letter) != std::string::npos); 
} 

換句話說，我把字符串中的所有元音一個搜索的字符串。如果有匹配，這封信就是一個元音。