How to use C++ to implement a simple student test score analysis program?

With the development of education, academic examinations have become an important part of people's daily lives. For students, test scores are an important indicator of their learning outcomes. Therefore, it is very necessary to conduct scientific analysis and statistics on test scores. Here, we will introduce how to use C to implement a simple student test score analysis program.

1. Requirements Analysis

Before we start writing a program, we need to analyze clearly the requirements of the program, including its functions, input and output, etc. The specific requirements are as follows:

1. Realize the input and output functions of multiple students’ test scores;
2. Realize statistical analysis of student test scores, such as total score, average score, The highest score and the lowest score, etc.;
3. realizes the sorting function of student test scores, which can be sorted by the total score or the score of each subject;
4. realizes the combined query function of student test scores , you can perform combined queries based on different conditions.

In view of the above requirements, we can start to design and write the program.

2. Design and Implementation

1. Design structure

Since this program needs to process the test scores of multiple students, we can use the structure to store information about each student. The specific code is as follows:

struct Student
{
    string name;  // 学生姓名
    int chinese;  // 语文成绩
    int math;     // 数学成绩
    int english;  // 英语成绩
    int total;    // 总成绩
};

2. Implementing the input and output function

The program needs to read the test scores of multiple students and output them to the screen or file. Therefore, we need to use the stream input and output functions in C to implement it. The specific code is as follows:

void inputStudent(Student &stu){   //输入学生信息
    cin >> stu.name >> stu.chinese >> stu.math >> stu.english;
    stu.total = stu.chinese + stu.math + stu.english;
}

void outputStudent(const Student &stu){ //输出学生信息
    cout << stu.name << "    " << stu.chinese << "    " << stu.math << "    "
         << stu.english << "    " << stu.total <<endl;   //输出每个学生的信息
}

3. Implementing the score statistics function

For the test scores of multiple students, we can traverse each student’s information and perform summation, Average and sort operations are used to analyze test scores. The specific code is as follows:

int calcTotalScore(const Student &stu){   //计算总分
    return stu.chinese + stu.math + stu.english;
}

double calcAverageScore(const Student &stu){  //计算平均分
    return (stu.chinese + stu.math + stu.english) / 3.0;
}

int getMaxScore(const vector<Student> &students){   //获取最高分
    int max_score = 0;
    for(int i = 0; i < students.size(); i++){
        if(students[i].total > max_score)
            max_score = students[i].total;
    }
    return max_score;
}

int getMinScore(const vector<Student> &students){   //获取最低分
    int min_score = 100;
    for(int i = 0; i < students.size(); i++){
        if(students[i].total < min_score)
            min_score = students[i].total;
    }
    return min_score;
}

4. Implementing the score sorting function

The sorting function is one of the key points in this program. It can help us understand the students' exam situation more intuitively . We can use the sort() function to sort student information. The specific code is as follows:

bool cmpTotalScore(const Student &stu1, const Student &stu2){    //按总分排序
    return stu1.total > stu2.total;
}

bool cmpChineseScore(const Student &stu1, const Student &stu2){  //按语文成绩排序
    return stu1.chinese > stu2.chinese;
}

bool cmpMathScore(const Student &stu1, const Student &stu2){     //按数学成绩排序
    return stu1.math > stu2.math;
}

bool cmpEnglishScore(const Student &stu1, const Student &stu2){  //按英语成绩排序
    return stu1.english > stu2.english;
}

5. Implementing the combined query function

Combined query is another function in this program A key feature is that it can conduct multi-condition queries on student test scores based on user needs. We can use if statements and switch statements to implement combined queries. The specific code is as follows:

void searchStudent(vector<Student> &students){   //查询学生成绩
    int cmd; //查询方式

    cout << "请选择查询方式：1. 按姓名查询；2. 按总分查询" << endl;
    cin >> cmd;
    switch (cmd) {
        case 1:   //按姓名查询
            {
                string name;
                cout << "请输入学生姓名：" << endl;
                cin >> name;
                for(int i = 0; i < students.size(); i++)
                {
                    if(students[i].name == name)
                        outputStudent(students[i]);
                }
            }
            break;
        case 2:   //按总分查询
            {
                int min_score, max_score;
                cout << "请输入查询范围：" << endl;
                cin >> min_score >> max_score;
                for(int i = 0; i < students.size(); i++)
                {
                    if(students[i].total >= min_score && students[i].total <= max_score)
                        outputStudent(students[i]);
                }
            }
            break;
        default:
            cout << "输入错误，请重新输入！" << endl;
            break;
    }
}

3. Testing and running

After completing the writing of the program, we can test and run the program . The specific steps are as follows:

1. Save the program to a .cpp file;
2. Use the C compiler to compile the program and generate an executable file;
3. Run the executable file, enter student information and commands in the command line to check the program running effect.

4. Summary

Through the above design and implementation of the student test score analysis program, we can see the efficiency and power of C language, especially in data processing and algorithms. The function is even more powerful. For beginners learning C, this program can be used as a very good practice example to help beginners deepen their understanding and mastery of the C language. At the same time, this program also has certain practical value and can help students analyze their test scores and improve learning efficiency and performance.

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