c++ - 我计算最终成绩的程序不计算它，我也不知道为什么

Question

我一直在尝试编写一个 C++ 程序来计算您的年终成绩(Google for Education C++ 类(class)提供的练习)。该程序有效，除了它不计算你的最终成绩，而是只输出“0”。我已经搜索了代码，但似乎找不到问题。

#include <iostream>
using namespace std;

int check(int a) {
    if (!(cin >> a)) {
        cout << "Come on, that isn't a score" << endl;
        return 0;
    }
}

int assignments() {
    int assignment1 = 0;
    int assignment2 = 0;
    int assignment3 = 0;
    int assignment4 = 0;

    cout << "Enter the score for the first assignment. ";
    check(assignment1);
    cout << "Enter the score for the second assignment. ";
    check(assignment2);
    cout << "Enter the score for the third assignment. ";
    check(assignment3);
    cout << "Enter the score for the fourth assignment. ";
    check(assignment4);
    return ((assignment1 + assignment2 + assignment3 + assignment4) / 4 * 0.4);

}

int mid() {
    int midterm = 0;
    cout << "Enter the score for the midterm. ";
    check(midterm);
    return (midterm * 0.15);
}

int finalex() {
    int finals = 0;
    cout << "Enter the score for the final. ";
    check(finals);
    return (finals * 0.35);
}

int participation() {
    int parti = 0;
    cout << "Enter the class participation grade. ";
    check(parti);
    return (parti * 0.1);
}

int main() {
    int assign = assignments();
    int midt = mid();
    int fingra = finalex();
    int partigra = participation();
    cout << "The final grade is: " << assign + midt + fingra + partigra << endl;
}

(我对每个等级类型都有不同程序的原因是因为类(class)规定你应该尽可能多地实现功能)

Answer 1

您应该将值作为引用传递给 check() 或进行检查以返回输入值。

改变

int check(int a)

到

int check(int& a)

Second method

修改检查为

int check(int a) {
    if (!(cin >> a)) {
        cout << "Come on, that isn't a score" << endl;
        return a;
    }
}

并使用返回值将输入分配给变量。喜欢

int midterm = 0;
    cout << "Enter the score for the midterm. ";
    midterm=check(midterm);