Ввести номер месяца, вывести количество дней в нем (решить двумя способами)

int a = -1;
cin >> a;
if( a == 1)
{
cout << "sdf";
}
else if(a == 2)

int a = -1;
cin >> a;
switch(a)
{
case 1: cout << "adasd"; break;
case 1: cout << "adas3423d"; break;
}

#include <iostream>
int main()
{
    int numberOfMonth;
    cout << "Enter number of month: ";
    cin >> numberOfMonth;
        switch(numberOfMonth) {
    case 1 : 
    case 3 : 
    case 5 : 
    case 7 : 
    case 8 : 
    case 10 : 
    case 12 : 
        cout << 31; 
        break;
    case 4 : 
    case 6 :
    case 9 : 
    case 11 : 
        cout << 30; 
        break;
    case 2: 
        cout << 28;
        break;
    default:
        cout << "The number of month is wrong!";
        break;
 
    }
    return 0;
}

#include <iostream>
#include <string>
 
using namespace std;
 
int main()
{
    string months[12] = {"January, 31", "February, 28", "March, 31", "April, 30", "May, 31", "June, 30", "July, 31", "August, 31", "September, 30", "October, 31", "November, 30", "December, 31"};
    int numberOfMonth;
    cout << "Enter number of month: ";
    cin >> numberOfMonth;
    if((numberOfMonth >= 1) && (numberOfMonth <= 12)) cout << months[numberOfMonth - 1];
    else cout << "the number of month is wrong!";
    return 0;
}