Conditional Statements Exercises Part 7

#include <iostream>

void main()
{
    int month = 0;
    int days = 0;

    std::cout << "Enter number of month: ";
    std::cin >> month;

    switch (month)
    {
        case 9:
        case 4:
        case 6:
        case 11:
            days = 30;
            break;
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            days = 31;
            break;
        case 2:
            days = 28;
            break;
        default:
            std::cout << "Not a valid month number!" << std::endl;
            break;
    }

    if (days != 0)
    {
        std::cout << "The days in month number " << month << " are: " << days << std::endl;
    }

    system("pause");
}