//------------------------------------------------
// Name: Edwin Dominguez Teco
// E-mail: edwindom@usc.edu
//------------------------------------------------

//------------------------------------------------
//--- If you wish, you may delete the comments ---
//---       below after you read them          ---
//------------------------------------------------

// Write your C++ program below to compute
// the days in a given month/year. Be sure
// to add appropriate #includes and other 
// necessary statements.  Also be sure to add
// comments and indent your code neatly. 
// To compile your program, click 'Build'
// To run your program, click 'Run' and you should
//  see the output and type in input in the window
//  below the editor.
// To submit your program, click 'Submit' and look
//  at the output in the bottom window to see if it
//  passes a few of our automated tests.

// ------------ Add #includes and other statments here ----------
#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;

// Prototype for isLeapYear function
bool isLeapYear(int year);


// This function takes the year as an input and should
// return 'true' if the year IS a leap year and 'false'
// otherwise.  By writing this separately and then 
// calling it in main(), the code for main() should be
// easier and more understandable
bool isLeapYear(int year)
{
    // ---------- Add your code here ------------------
    
// Leap Year condition based on the module of 4 for every four year leap year
// Nested Century condition based on whether year is divisible by 100 and not divisible by 400
    if(year%4==0){ 
        if(year%100==0 && year%400!=0){
            return false; 
        }else{
            return true;
        }
    }else{
        return false;
    }
}

int main()
{
// Ask user to input month and year and declare those variables
    cout << "Enter the desired month (1-12) and year (0000)" << endl;
    int userMonth, userYear;
    cin >> userMonth >> userYear;
    
    
// Conditional for months that have 31 and 30 days
// Conditional for february's days taking into account whether its a leap year or not
// Conditional for anything thats outside the 1 to 12 monthly range
    if(userMonth == 1 || userMonth == 3 || userMonth == 5 || userMonth == 7 || userMonth == 8 || userMonth == 10 || userMonth == 12){
        cout << "There are 31 days in this month!" << endl;
    }else if(userMonth == 4 || userMonth == 6 || userMonth == 9 || userMonth == 11){
        cout << "There are 30 days in this month!" << endl;
    }else if(userMonth == 2 && isLeapYear(userYear)== true ){
        cout << "There are 29 days in this month!" << endl;
    }else if(userMonth == 2 && isLeapYear(userYear)== false ){
        cout << "There are 28 days in this month!" << endl;
    }else if(userMonth > 12 || userMonth < 1){
        cout << -1<< endl;
    }
    return 0;
}