将播放器输入与单词文件进行比较

Question

学生程序员正在寻找作业的帮助。Jist的程序是接受用户输入的字符，将其与文件中的合法三个字母的单词进行比较。必须先将用户输入的内容输出到屏幕上，当然还需要调用函数中的多个函数。距离我上一次课程(海外工作旅行)已经过去一年多了，所以我失去了之前学到的一点知识。如果有人能看看我的代码，告诉我我是在正确的道路上还是走错了路，我将不胜感激。具体地说，我如何测试玩家是否输入了小写字母，以及如何将玩家字母与合法单词文件进行比较？如果教得正确，我学得很快。准备好红色墨水了。#include #include //字符串类需要这个#include //必须有这个才能处理文件

using namespace std;

//Declare Functions before the main??
char menu(); //function prototype for menu function
void processUserInput(); //function prototype for user input function
string findWords(string);
void readLegalWords();


int main()
{
cout<<"Welcome to Jellos TLW Game"<<endl;
char menuChoice = ' '; //variable to hold user's choice

//Call to menu function
menu();

system ("Pause");
return 0;
}

//Begin函数定义//从菜单函数开始提示游戏玩家

char menu()
{
char menuChoice = ' '; //variable to hold choice
cout<<"Enter your Choice: "<<endl;
cout<<"    (F)ind Words"<<endl;
cout<<"    (Q)uit"<<endl;
cin>>menuChoice;

    if(menuChoice == 'F' || menuChoice == 'f')
    {
        /*call to function that will ask user to enter
        between 3-10 letters*/
        processUserInput();

    }
    else if(menuChoice == 'Q' || menuChoice == 'q')
    {
        cout<<"Thanks for playing Jellos TLW Game!"<<endl;
        return 0;
    }
} //end of menu function


void processUserInput(char); //function definition
{
cout<<"Enter up to 10 lowercase letters."<<endl;
cout<<"You must enter at least 3 letters."<<endl;
cout<<"Enter a '-' to stop reading letters if you want less than  
10."<<endl;

//variable to hold string of letters
string inputLetters;
//read the letters
cin>>inputLetters;

if(inputLetters.size() >= 3 && inputLetters.size() <= 10 && inputLetters 
== '-')

   {    //display what the player typed in to screen on one line
    cout<<"you entered the following letters."<<inputLetters<<endl;
    //call to function to test the letters against legal 3 letter word 
 file
            //read into an array of legal 3-letter words.
    //

    findWords(string);//function call
    }

    else if(letters.size() < 3 && letters.size() > 10) //test the input
     {
         cout<<"Please enter between 3-10 lowercase letters."<<endl;
     }
 }


/* Test the following conditions are met
** at least 3 letters are entered
** no more than 10 letters are entered
** so long as 3 letters are entered a - will stop input
** all input is lowercase letter or - anything else will display error  
message

** once input is entered correctly the letters the player entered are 
displayed
back to him/her on a single line

** correct data will call to function findWords() which will fill an 
array with 
legal 3 letter words from player input and print the words if there are 
more than 1 

** findWords() will most likely have to compare string arrays (player 
input vs file that 
is read from another function */



//Need to test three conditions
//If player entered 3-10 letters
//If player entered lowercase letters
//do not know how to test whether player entered lower case letters

Answer 1

我建议您使用toupper()或tolower()将字符转换为大写或小写，以便只进行一次比较。

其次，如果文件不是非常大，请将单词读入字符串向量，例如std::vector<string>。

输入播放器字符串。遍历向量，使用==或!=将播放器的文本与文件中的单词进行比较。

一种选择是对向量中的单词进行排序，并使用类似std::lower_bound的内容来查找单词。如果对向量进行了排序，则不必搜索整个内容。