C++ 计算分数和提问总数

我试图在结束测试函数中输出每个加法、减法、乘法、除法的分数。以及所问问题的总数。 **任何帮助都将不胜感激

顺便说一句，这只是使用本地函数，并通过参考分数。它应该输出正确答案的数量

还有一种方法可以防止程序让您多次选择选项吗

以下是我目前得到的信息：

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



int addition(int addscore);
int subtraction(int subscore);
int multiplication(int multiscore);
int division(int divscore);
int endtest(int & addscore, int & subscore, int & multiscore, int & divscore);
main() {
    int end_final = 0;

    do {

        int addscore, subscore, multiscore, divscore;
        char choice;
        cout << "A- " << "Addition\n";
        cout << "B- " << "Subtraction\n";
        cout << "C- " << "Multiplication\n";
        cout << "D- " << "Division\n";
        cout << "E- " << "End of Test\n";
        cin >> choice;
        cout << endl << endl;

        switch (choice) {

            case 'A':
            case 'a':
                addition(addscore);
                break;


            case 'B':
            case 'b':
                subtraction(subscore);
                break;

            case 'C':
            case 'c':
                multiplication(multiscore);
                break;

            case 'D':
            case 'd':
                division(divscore);
                break;

            case 'E':
            case 'e':
                endtest(addscore, subscore, multiscore, divscore);
                break;
        }
    }
    while (end_final != 1);


    return 0;
}

int addition(int addscore) {
    int iRandom;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen addition\n";
    int randnum1, randnum2;
    int total = 0;


    for (int i = 1; i <= 5; i++) {
        randnum1 = rand() % 15 + 1;
        randnum2 = rand() % 15 + 1;
        cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
        cin >> answer;
        cin.ignore(80, '\n');
        total++;
        if (answer == randnum1 + randnum2) {
            cout << "Correct! \n";
            addscore++;
        } else {
            cout << "Incorrect \n";
        }


    }
}





int subtraction(int subscore) {
    int iRandom;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen subtraction\n";
    int randnum1, randnum2;
    int total = 0;

    while (total != 5) {
        randnum1 = rand() % 20 + 1;
        randnum2 = rand() % 20 + 1;
        if (randnum1 >= randnum2) {

            cout << randnum1 << " " << "-" << " " << randnum2 << " " << "= ";
            cin >> answer;
            cin.ignore(80, '\n');
            total++;
            if (answer == randnum1 - randnum2) {
                cout << endl;
                cout << "Correct!\n ";
                subscore++;
            } else {
                cout << "Incorrect\n ";
            }

        }
    }
}






int multiplication(int multiscore) {
    int iRandom;
    int total = 0;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen Multiplication\n";
    int randnum1, randnum2;


    for (int i = 1; i <= 5; i++) {
        randnum1 = rand() % 20 + 1;
        randnum2 = rand() % 20 + 1;
        cout << randnum1 << " " << "x" << " " << randnum2 << " " << "= ";
        cin >> answer;
        cin.ignore(80, '\n');
        total++;
        if (answer == randnum1 * randnum2) {
            cout << endl;
            cout << "Correct! \n";
            multiscore++;
        } else {
            cout << "Incorrect\n ";
        }


    }
}




int division(int divscore) {
    int iRandom;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen Division\n";
    int randnum1, randnum2;

    int total = 0;
    while (total != 5) {

        randnum1 = rand() % 13 + 1;
        randnum2 = rand() % 13 + 1;
        if (randnum1 % randnum2 == 0) {

            cout << randnum1 << " " << "/" << " " << randnum2 << " " << "= ";
            cin >> answer;
            cin.ignore(80, '\n');
            total++;

            if (answer == randnum1 / randnum2) {
                cout << endl;
                cout << "Correct! \n";
                divscore++;
            } else {
                cout << "Incorrect\n ";
            }

        }
    }
}





int endtest(int & addscore, int & subscore, int & multiscore, int & divscore) {
    int total = 0;




    cout << endl << endl;
    cout << "Addition" << " " << addscore++ << endl;
    cout << "Subtraction" << " " << subscore << endl;
    cout << "Multiplication" << " " << multiscore << endl;
    cout << "Division" << " " << divscore << endl;
    cout << "Total" << " " << total << endl;

}

#包括
#包括
#包括
#包括
#包括
使用名称空间std；
整数相加（整数相加分数）；
整数减法（整数子核）；
整数乘法（整数多核）；
整数除法（整数除法）；
内部测试（内部和添加分数、内部和子分数、内部和多分数、内部和divscore）；
main（）{
int end_final=0；
做{
int addscore、子核、多核、divscore；
字符选择；
cout要澄清代码，请声明一个枚举

您可以使用全局数组

int used[]  = { 0,0,0,0 }; // not used
int total[] = { 0,0,0,0 }; // total questions per operation
int score[] = { 0,0,0,0 }; // score per operation

然后，在
do{

if ( ! used[ADDITION]) cout << "A- " << "Addition\n";

// initialize variables to zero
int addscore=0, subscore=0, multiscore=0, divscore=0;

添加代码变为

int addition(int addscore) {
    int iRandom;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen addition\n";
    int randnum1, randnum2;

    total[ADDITION] = 0; // should not be 
    score[ADDITION] = 0; // ...necessary (but in case you call it again)

    for (int i = 0; i < 5 ; i++) { 
        randnum1 = rand() % 15 + 1;
        randnum2 = rand() % 15 + 1;
        cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
        cin >> answer;
        cin.ignore(80, '\n');
        total[ADDITION]++;  // total is incremented for Addition
        if (answer == randnum1 + randnum2) {
            cout << "Correct! \n";
            score[ADDITION]++;  // score is incremented
        } else {
            cout << "Incorrect \n";
        }
    }
}


因为这是C++，还可以进行一个类操作，然后每个操作一个子类，保存操作的名称，重写执行特定操作的“执行”方法，然后声明持有每个操作实例的父类数组……/P>

根据OP的评论，在
do{

if ( ! used[ADDITION]) cout << "A- " << "Addition\n";

// initialize variables to zero
int addscore=0, subscore=0, multiscore=0, divscore=0;

在开关中

    case 'A':
    case 'a':
      used[ADDITION] = 1; // tells addition was used
      addition( &addscore ); // <== gives the pointer to that variable
      break;

案例“A”：
案例“a”：
used[ADDITION]=1；//表示已使用加法
添加（&addscore）；//每次输入选项时，您都可以有另一个计数器。相应地递增计数器，然后显示相关消息。您的计算函数从不返回值。您正在递增函数参数。此外，所有分数变量都未初始化，因此使用它们是一种未定义的行为。我对enum不太熟悉：（有没有办法只使用局部函数来实现这一点？你可以用语义相似的
int ADDITION=0；int减法=1；…
替换enum。局部函数？如果你是这个意思，你可以在每个函数声明前添加
static
，或者是使用全局变量的问题？@ringøYou似乎对此非常了解，但我认为该程序应该是基本的。我可以通过电子邮件向您进一步解释我试图完成的任务吗？请尝试在问题中进行澄清，以便每个人都能看到，也许其他人会有更好的答案。@ringø基本上我的代码中所有内容都正常工作，但如果我选择end test w由于某些原因，在没有运行其他选择的情况下，减法和除法没有初始化为0。因此，当我将每个选择的分数相加时，它会给我一个奇怪的结果
// initialize variables to zero
int addscore=0, subscore=0, multiscore=0, divscore=0;

    case 'A':
    case 'a':
      used[ADDITION] = 1; // tells addition was used
      addition( &addscore ); // <== gives the pointer to that variable
      break;

int addition(int *addscore) { // <== gets a pointer
    int iRandom;

    // initialize random seed:
    srand(time(NULL));

    int answer;

    cout << "You have chosen addition\n";
    int randnum1, randnum2;

    total[ADDITION] = 0; // 
    score[ADDITION] = 0; // using your way, this is not necessary anymore

    for (int i = 0; i < 5 ; i++) { 
        randnum1 = rand() % 15 + 1;
        randnum2 = rand() % 15 + 1;
        cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
        cin >> answer;
        cin.ignore(80, '\n');
        total[ADDITION]++;  // total is incremented for Addition
        if (answer == randnum1 + randnum2) {
            cout << "Correct! \n";
            // score[ADDITION]++;  // score is incremented (see above)
            *addscore++; // <== increment variable pointed to by pointer
        } else {
            cout << "Incorrect \n";
        }
    }
}