一个输出最低、高、总、平均成绩的代码，但是输出都是0

问题遇到的现象和发生背景

想要做一个输出最低、高、总、平均成绩的代码，但是最后输出都是0，感觉应该是函数的int s1那一部分的问题，但是不知道如何更改

用代码块功能插入代码，请勿粘贴截图

#include 
#include 

using namespace std;


int getScore(string);
void findLowestScore(int, int, int, int);
void findHighestScore(int, int, int, int);
void findAverageScore(int, int, int, int);

int main()
{
    int examM, examP, examC, examE;

    for (int i = 0; i < 4; i++)
    {
        switch (i)
        {
        case 0:
            examM = getScore("Maths");
            break;
        case 1:
            examP = getScore("Physics");
            break;
        case 2:
            examC = getScore("Chemistry");
            break;
        case 3:
            examE = getScore("English");
            break;
        }
    }
    findLowestScore(examM, examP, examC, examE);
    findHighestScore(examM, examP, examC, examE);
    findAverageScore(examM, examP, examC, examE);
    return 0;
}

int getScore(string subject)
{
    int scores = 0;
    cout << "Please type in your score for " << subject << ": ";
    cin >> scores;

    while (scores < 0)
    {
        cout << "Invalid input, please re-enter your score!" << endl;
        cin >> scores;
    }
    return 0;
}

void findLowestScore(int s1, int s2, int s3, int s4)
{
    int lowest = 0;
    string subject = "";

    if (s1 < s2 && s1 < s3 && s1 < s4)
    {
        lowest = s1;
        subject = "Maths";
    }
    else if (s2 < s1 && s2 < s3 && s1 < s4)
    {
        lowest = s2;
        subject = "Physics";
    }
    else if (s3 < s1 && s3 < s2 && s3 < s4)
    {
        lowest = s3;
        subject = "Chemistry";
    }
    else
    {
        lowest = s4;
        subject = "English";
    }

    cout << "The lowest score is obtained for " << subject << " with a score of " << lowest << endl;

}

void findHighestScore(int s1, int s2, int s3, int s4)
{
    int highest = 0;
    string subject = "";

    if (s1 > s2 && s1 > s3 && s1 > s4)
    {
        highest = s1;
        subject = "Maths";
    }
    else if (s2 > s1 && s2 > s3 && s1 > s4)
    {
        highest = s2;
        subject = "Physics";
    }
    else if (s3 > s1 && s3 > s2 && s3 > s4)
    {
        highest = s3;
        subject = "Chemistry";
    }
    else
    {
        highest = s4;
        subject = "English";
    }

    cout << "The highest score is obtained for " << subject << " with a score of " << highest << endl;

}

void findAverageScore(int s1, int s2, int s3, int s4)
{
    int total = 0;
    int avg = 0;

    total += s1 + s2 + s3 + s4;
    avg = total / 4;

    cout << "The total is: " << total << endl;
    cout << "The average is: " << avg << endl;
}

51行， return 0;改为return scores
你自己返回了0啊，输入的成绩你不返回