Untitled

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

int main() {
    setlocale(LC_ALL, "Russian");

    int bestAvg = 0;
    int worstAvg = 5;
    std::string worst = "";
    std::string best = "";

    int total = 0;
    float avg = 0;
    int count = 0;

    int totalE = 0;
    float avgE = 0;
    int countE = 0;

    int totalR = 0;
    float avgR = 0;
    int countR = 0;

    int totalM = 0;
    float avgM = 0;
    int countM = 0;

    int input = 0;
    char subject = ' ';
    std::cout << "Добавить оценку: 1 \n" << "Посмотреть средний бал: 1 \n" << "Посмотреть предметы с худшей и лучшей успеваемостью: 3 \n" << "Выйти: 4 \n";

    while (true) {
        std::cin >> input;
        switch (input) {
        case 1:
            std::cin >> input >> subject;

            switch (subject) {
                std::cout << "Математика: M \n" "Русский: R \n" "Английский: E \n";
            case 'E':
                totalE += input;
                countE++;
                avgE = (float)totalE / countE;

                switch (avgE > bestAvg) {
                    case true:
                        bestAvg = avgE;
                        best = "Английский";
                        break;
                }

                switch (avgE < worstAvg) {
                case true:
                    worstAvg = avgE;
                    worst = "Английский";
                    break;
                }

                break;

            case 'R':
                totalR += input;
                countR++;
                avgR = (float)totalR / countR;

                switch (avgE > bestAvg) {
                    case true:
                        bestAvg = avgE;
                        best = "Русский";
                        break;
                }

                switch (avgE < worstAvg) {
                    case true:
                        worstAvg = avgE;
                        worst = "Русский";
                        break;
                }

                break;

            case 'M':
                totalM += input;
                countM++;
                avgM = (float)totalM / countM;

                switch (avgE > bestAvg) {
                    case true:
                        bestAvg = avgE;
                        best = "Математика";
                        break;
                }

                switch (avgE < worstAvg) {
                    case true:
                        worstAvg = avgE;
                        worst = "Математика";
                        break;
                }

                break;
            }

            total += input;
            count++;
            avg = (float)total / count;
            break;

        case 2:
            std::cout << "По всем предметам: " << avg << "\nПо математике: " << avgM << "\nПо русскому языку: " << avgR << "\nПо английскому языку: " << avgE << std::endl;
            break;

        case 3:
            std::cout << "C худшей успеваемостью: " << worst << "\nC лучшей успеваемостью: " << best;
            break;

        case 4:
            return 0;
        }
    }
}