C++ GWA计算器开发：存储多课程名称并关联学分成绩展示问题

核心问题分析 #

你当前代码的核心问题是仅使用单个字符数组c_name[50]存储课程名称，每次输入新课程时会覆盖之前的内容，导致最终只能显示最后一门课的名字。此外还有几处不符合标准C++规范的写法和小bug，以下是修复方案：

关键修改点 #

• 存储多门课程名称：将单个字符数组替换为vector<string>，用于动态存储所有课程的名称，避免覆盖问题。
• 替换非标准可变长度数组：C++标准不支持float unit[q]这类可变长度数组，改用vector<float>存储学分和成绩，更安全且符合规范。
• 修复结果展示逻辑：在输出部分添加循环，逐行打印每门课程的名称、学分和成绩。
• 补充必要头文件：添加<iostream>、<string>、<vector>头文件，支持输入输出、字符串和动态数组功能。
• 修复笔误与不良写法：修正calculateGPA()为calculateGWA()；避免递归调用main()，改用循环实现菜单逻辑；移除不必要的goto语句。

修复后的完整代码 #

#include <iostream>
#include <string>
#include <vector>
#include <stdlib.h>

using namespace std;

void calculateGWA();
void showMainMenu();

int main() {
    showMainMenu();
    return 0;
}

void showMainMenu() {
    int input;
    do {
        system("cls");
        cout << "		 -------------------------------------------------------------------------- " << endl;
        cout << "		|                                GWA Calculator                           |" << endl;
        cout << "		 -------------------------------------------------------------------------- " << endl;
        cout << "		|            MENU:                                                          |" << endl;
        cout << "		|                   1. Calculate GWA (General Weighted Average)             |" << endl;
        cout << "		|                   2. Calculate CGWA (Cumulative Weighted Average)         |" << endl;
        cout << "		|                   3. Exit Application                                     |" << endl;
        cout << "		|                                                                         |" << endl;
        cout << "		 -------------------------------------------------------------------------- " << endl;
        
        cout << "		Enter your choice: ";
        cin >> input;

        switch(input) {
            case 1:
                calculateGWA();
                break;
            case 2:
                // calculateCGWA();
                cout << "\nCGWA功能暂未实现，按任意键返回主菜单..." << endl;
                cin.ignore();
                cin.get();
                break;
            case 3:
                exit(EXIT_SUCCESS);
                break;
            default:
                cout << "输入错误，请重试！\n" << endl;
                cin.ignore();
                cin.get();
                break;
        }
    } while(true);
}

void calculateGWA() {
    int q;
    system("cls");
    cout << "-------------- GWA Calculator -----------------" << endl;
    cout << " How many course(s)?: ";
    cin >> q;

    vector<string> c_name(q);
    vector<float> unit(q);
    vector<float> grade(q);

    cout << endl;
    for(int i = 0; i < q; i++) {
        cout << "Enter the Course Name " << i+1 << ": ";
        cin >> c_name[i];
        cout << "Enter the Unit " << c_name[i] << ": ";
        cin >> unit[i];
        cout << "Enter the Grade " << c_name[i] << ": ";
        cin >> grade[i];
        cout << "-----------------------------------\n" << endl;
    }

    float sum = 0;
    for(int j = 0; j < q; j++) {
        sum += unit[j] * grade[j];
    }

    float totCr = 0;
    for(int k = 0; k < q; k++) {
        totCr += unit[k];
    }
    system("cls");

    // 打印课程信息与GWA结果
    cout << "		 =============================================================== " << endl;
    cout << "		|           COURSE             |      UNIT      |     GRADE     |" << endl;
    cout << "		 =============================================================== " << endl;
    for(int i = 0; i < q; i++) {
        cout << "		| " << c_name[i];
        // 格式化对齐，让输出更美观
        for(int len = c_name[i].size(); len < 25; len++) cout << " ";
        cout << "|      " << unit[i] << "      |     " << grade[i] << "     |" << endl;
    }
    cout << "		 =============================================================== " << endl;
    cout << "\nTotal Points: " << sum << "\nTotal Credits: " << totCr << "\nTotal GWA: " << sum/totCr << "." << endl;

    int inmenu;
    do {
        cout << "\n\n1. Calculate Again" << endl;
        cout << "2. Go Back to Main Menu" << endl;
        cout << "3. Exit This App\n" << endl;
        cout << "Your Input: ";
        cin >> inmenu;

        switch(inmenu) {
            case 1:
                calculateGWA();
                return;
            case 2:
                return;
            case 3:
                exit(EXIT_SUCCESS);
            default:
                cout << "\n输入错误，请重新选择！" << endl;
                break;
        }
    } while(true);
}

说明 #

• 用vector<string>存储课程名称，每门课的名字都会被保留，不会被覆盖。
• 结果展示部分添加了格式化对齐，让输出更整齐易读。
• 菜单逻辑改用do-while循环替代goto和递归调用，代码更易维护。
• 修复了原代码中的笔误和未实现功能的提示。

内容的提问来源于stack exchange，提问作者jeck.98