Odd vs Even

#include <bits/stdc++.h>
using namespace std;
bool isCheck(int a)
{
    int mask = a & (1);
    if (mask)
    {
        return false;
    }
    else
    {
        return true;
    }
}
int main()
{
    int a;
    cin >> a;

    if (isCheck(a))
    {
        cout << "Number is even" << endl;
    }
    else
    {
        cout << "Number is odd" << endl;
    }
    return 0;
}