谁能告诉我为什么这些函数没有给我一个合理范围的结果?

问题描述

下面列出了我正在使用的完整代码，它应该模拟掷骰子游戏并向用户打印详细信息，并允许在用户需要时进行投注.除了实际的掷骰子游戏外，一切正常.它不是仅在没有与 crapsResult 相关联的真值时才循环，而是找到一个真实值和一个由单个负数组成的难以理解的字符串.任何帮助将不胜感激.

The full code I am using is listed below, it is supposed to simulate a game of craps and print details to the user and allow for betting if the user desires it. Everything functions except for the actual craps game. Instead of looping only while there is not a truth value associated to crapsResult, it finds one real value and an incomprehensible string of a single negative number. Any help would be appreciated.

int main()
{
    //Declare the user input variables
    int gamesPlayed = 0;
    char inputPrint = ' ';
    char isBetting = ' ';
    int startingBet = 0;

    //Declare the variables used by the program
    int endingBet = 0;
    int currentGame = 0;
    bool crapsResult;
    int gamesWon = 0;
    int gamesLost = 0;
    double percentWon = 0;
    bool detailPrint = false;

    //Prompt the user to input their variables
    cout << "Enter the number of games to be played: ";
    cin >> gamesPlayed;
    while(gamesPlayed < 1)
    {
        cout << "   Error: must be greater than 0" << endl;
        cout << "Enter the number of games to be played: ";
        cin >> gamesPlayed;
        cin.clear();
        cin.ignore();
    }

    cout << "Do you wish to print details (Y/N): ";
    cin >> inputPrint;
    if(inputPrint == 'y' || inputPrint == 'Y')
    {
        detailPrint = true;
    }

    cout << "Do you wish to bet (Y/N): ";
    cin >> isBetting;

    if(isBetting == 'y' || isBetting == 'Y')
    {
        cout << "Enter money to start betting with: ";
        cin >> startingBet;
        while(startingBet < 1)
        {
            cout << "   Error: must be greater than 0" << endl;
            cout << "Enter the number of games to be played: ";
            cin >> gamesPlayed;
            cin.clear();
            cin.ignore();
        }
    }
    //Seed the random number generator
    srand(time(NULL));

    //Set a value for ending bet
    if(startingBet == 0)
    {
        endingBet = 1;
    }
    else
    {
        endingBet = startingBet;
    }
    //Call playcraps to simulate the game for as many games as the user input
    for(currentGame = 1; currentGame <= gamesPlayed && endingBet > 0; currentGame += 1)
    {
        crapsResult = NULL;
        crapsResult = playCraps(currentGame, detailPrint, isBetting, startingBet);
        if(crapsResult == true)
        {
            gamesWon += 1;
            endingBet = betting(endingBet, crapsResult);
        }
        if(crapsResult == false)
        {
            gamesLost += 1;
            endingBet = betting(endingBet, crapsResult);
        }
        if((isBetting == 'Y' || isBetting == 'y') && (detailPrint == true))
        {
            cout << "Money left is $" << endingBet << endl;
        }
    }

    //Calculate the percentage of games won
    percentWon = (double(gamesWon) / double(currentGame-1)) * 100.0;

    //Print the results to the user
    if(isBetting == 'Y' || isBetting == 'y')
    {
        cout << "Money at end of games is $" << endingBet << endl;
    }
    cout << "The number of games played is " << currentGame - 1 << endl;
    cout << "The number of games won is " << gamesWon << endl;
    cout << "The number of games lost is " << gamesLost << endl;
    cout << "The percent of games won is " << fixed << showpoint << setprecision(3) << percentWon << endl;
}

//Simulates the roll of a single die and returns the result
int roll()
{
    int rollResult = 0;
    rollResult = rand() % 6 + 1;
    return rollResult;
}

//Calls roll twice and returns the sum of the two results
int roll2Dice()
{
    //Declare variables for this function
    int rollOne = 0;
    int rollTwo = 0;
    int rollSum = 0;

    //Find rollOne and rollTwo
    rollOne = roll();
    rollTwo = roll();

    //Find rollSum
    rollSum = rollOne + rollTwo;

    return rollSum;
}

bool playCraps(int currentGame, bool detailPrint, char isBetting, int startingBet)
{
    bool crapsResult = NULL;
    int currentGameStorage[100];
    int currentRoll = 1;
    int point = roll2Dice();
    int printingNumber = 0;
    currentGameStorage[0] = point;
    if(point == 7 || point == 11)
    {
        crapsResult = true;
    }
    else if(point == 2 || point == 3 || point == 12)
    {
        crapsResult = false;
    }
    else
    {
        crapsResult = NULL;
    }
    while(crapsResult != true && crapsResult != false)
    {
        currentGameStorage[currentRoll] = roll2Dice();
        if(currentGameStorage[currentRoll] == point)
        {
            crapsResult = true;
        }
        else if(currentGameStorage[currentRoll] == 7)
        {
            crapsResult = false;
        }
        currentRoll += 1;
    }
    if(detailPrint == true)
    {
        cout << "Game " << currentGame << ": ";
        for(printingNumber = 0; printingNumber <= currentRoll; printingNumber += 1)
        {
            cout << currentGameStorage[printingNumber] << " ";
        }
        if(crapsResult == true)
        {
            cout << "win";
        }
        else if(crapsResult == false)
        {
            cout << "lose";
        }
        cout << endl;
    }
    return crapsResult;
}

int betting(int endingBet, bool crapsResult)
{
    if(crapsResult == true)
    {
        endingBet += 1;
    }
    else if(crapsResult == false)
    {
        endingBet -= 1;
    }
    return endingBet;
}

推荐答案

只是略读了一下，并没有阅读你的所有代码(所以也可能有其他问题)，但这行肯定有问题:

Just skimmed and didn't read all of your code (so there may be other things wrong too), but this line is definitely problematic:

while(crapsResult != true && crapsResult != false)

crapsResult 同时为both真和假在逻辑上是不可能的，因此永远不会进入循环.

It is logically impossible for crapsResult to simultaneously be both true and false, so that loop will never be entered.

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