switch statement

#include <iostream>

int main() {
    char grade;

    std::cout << "Enter your grade: ";
    std::cin >> grade;

    switch (grade) {
        case 'A':
        case 'a':
            std::cout << "Excellent!";
            break;

        case 'B':
        case 'b':
            std::cout << "Good!";
            break;

        case 'C':
        case 'c':
            std::cout << "Average.";
            break;

        case 'D':
        case 'd':
            std::cout << "Needs improvement.";
            break;

        case 'F':
        case 'f':
            std::cout << "Fail.";
            break;

        default:
            std::cout << "Invalid grade.";
    }

    return 0;
}