Question

我无法按照规范完成作业。这是分配方案：

大学迫切需要一个自动测试评分系统。使用C ++，为大学写一个评分系统，并对至少五名学生的测试进行评分。

要创建评分系统，请按照以下步骤操作：

首先询问测试中的问题数量

然后要求每个问题的正确答案。请注意，多项选择测试和问题将有从A到D的答案。

询问学生人数并通过询问他们的姓名来处理每个学生，然后循环询问学生答案的问题。

为每个问题打分。

在最后一个问题计算出学生得分并显示“学生'插入学生姓名'得分为20分中的10分或50％。”

重复直到所有学生都得分。

在对所有学生进行评分后，以与以前相同的方式插入打印所有学生成绩的班级列表。

这是我到目前为止所做的：

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    //declare variables
    char choice;
    string studentName;
    vector<char> answers;
    vector<string> names;
    int getStudents();
    int getQuestions();

    //calls function to get number of questions
    float questions = getQuestions();


    //Get answers
    for (int i = 0; i < questions; ++i) {
        cout << "What is the answer for question " << i + 1 << endl;
        cin >> choice;
        answers.push_back(choice);
    }

    //Get number of students
    int students = getStudents();


    //Get student names
    for (int i = 0; i < students; i++) {
        cout << "Student " << i + 1 << ", what is your name?" << endl;
        cin >> studentName;
        names.push_back(studentName);
    }

    float score = 0;
    char studentAnswer;
    vector<char> userAnswer;
    vector<float> finalScore;

    //gets student answers
    for (int i = 0; i < students; i++) {
        for (int j = 0; j < questions; j++) {
            cout << names[i] << ", what is your answer for question " << j + 1 << "?" << endl;
            cin >> studentAnswer;
            userAnswer.push_back(studentAnswer);
        }
    }



    //calculates student scores
    for (int i = 0; i < students; i++) {
        for (int j = 0; j < questions; j++) {
            if (userAnswer[j] == answers[j])
                score = score + 1;
                }       
        finalScore.push_back(score);
    }

    //outputs scores
    for (int i = 0; i < students; i++) {
        cout << names[i] << " scored " << finalScore[i] << " out of " << questions <<
            " or " << (finalScore[i] / questions) * 100 << "%" << endl;
    }



    system("pause");
    return 0;
}
//function to get number of questions
int getQuestions()
{
    int questions;
    cout << "How many questions are there?" << endl;
    cin >> questions;
    return questions;
}
//function to get number of students
int getStudents()
{
    int students;
    cout << "How many students are there?" << endl;
    cin >> students;
    return students;
}

最终得分返回的值不准确，我无法找到错误发生的位置。

同样，对于最后一步的排序，我被要求按升序或字母顺序按降序和名称排序。我可以相互独立地对它们进行排序，但不知道如何将它们组合起来并按照这种方式对它们进行排序。

Answer 1

您将score初始化为0，但之后您不会为每位学生重置它。你应该这样做：

    //calculates student scores
    for (int i = 0; i < students; i++) {
        score = 0; // here, so that it is reset for each student

顺便提一下，您的questions变量是float，我想您想要int。

Answer 2

//calculates student scores
for (int i = 0; i < students; i++) {
    score = 0; //Fabio was right you need to reset score to 0 for each student
    for (int j = 0; j < questions; j++) {
        if (userAnswer[j] == answers[j])
            score = score + 1;
            }       
    finalScore.push_back(score);
}

当你检查userAnswer是否等于answers时，你总是从0开始。所以你每次都要检查学生1的答案。你可以尝试：

if (userAnswer[i*questions+j] == answers[j])

C ++自动评分系统

2 个答案: