P58459: Dates vàlides

#include <iostream>
using namespace std;


//Pre: Llegeix una data
//Post: Sabem si es correcta o no
bool es_data_valida(int d, int m, int a) {
    if (m == 1 or m == 3 or m == 5 or m == 7 or m == 8 or m == 10 or m == 12) {
        if (d <= 31 and d > 0) return true;
        else return false;
    }
    else if (m == 2) {
        if (a%4 == 0) {
            if ((a%100 != 0) or (a%100 == 0 && (a/100)%4 == 0))
                if (d <= 29 and d > 0) return true;
                else return false;
            else {
                if (d <= 28 and d > 0) return true;
                else return false;
            }
        }
        else {
            if (d <= 28 and d > 0) return true;
            else return false;
        }
    }
    else {
        if (m > 0 and m < 12) {
            if (d <= 30 and d > 0) return true;
            else return false;
        }
        else return false;
    }
}