write a c++ program to calculate the GPA of each students input in the total average score

在C++中编写一个程序来计算每个学生输入的总平均分数及GPA，首先需要了解GPA通常是基于课程成绩点数（Grade Point Average）来计算的，通常美国系统使用4.0分制。下面是一个简单的示例，它会提示用户输入学生成绩及其对应学分，并计算GPA：

#include <iostream>
using namespace std;

// 定义一个结构体表示一门课程
struct Course {
    string name;
    double score; // 成绩
    int credit_hours; // 学分小时
};

// 计算单门课程的GPA
double calculate_gpa(double score, int credit_hours) {
    return (score * credit_hours) / 4.0;
}

int main() {
    const int MAX_STUDENTS = 5;
    Course students[MAX_STUDENTS];

    for (int i = 0; i < MAX_STUDENTS; ++i) {
        cout << "请输入第" << i+1 << "位学生的课程信息（课程名、成绩和学分小时，按空格分隔）：" << endl;
        cin >> students[i].name >> students[i].score >> students[i].credit_hours;
        
        // 计算并打印GPA
        double gpa = calculate_gpa(students[i].score, students[i].credit_hours);
        cout << "学生 " << students[i].name << " 的课程 " << students[i].name << " 的GPA是: " << gpa << endl;
    }

    // 计算所有课程的总平均分
    double total_score = 0;
    double total_credits = 0;
    for (const auto& student : students) {
        total_score += student.score * student.credit_hours;
        total_credits += student.credit_hours;
    }
    
    if (total_credits != 0) {
        double overall_gpa = total_score / total_credits;
        cout << "所有课程的总平均GPA是: " << overall_gpa << endl;
    } else {
        cout << "没有输入任何课程，无法计算总GPA。\n";
    }

    return 0;
}