Program To Find The Day From Given Date In C++ | C++ Program

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#include <iostream>
#include <stdlib.h>
using namespace std;


/*
__author__ = suraj singh bisht
__email__  = surajsinghbisht054@gmail.com
__Github__ = https://github.com/surajsinghbisht054


####################################################################
#          Find Correct Weekday From Exact Date                    # 
####################################################################
*/


// check day
bool check_date(int day, int month){
 if ((month==2) && (day>0) && (day<30)){
 return true;
 }
 if ((
 (month==1) ||
 (month==3) ||
 (month==5) ||
 (month==7) ||
 (month==8) ||
 (month==10)||
 (month==12)
 ) && ((day>0) && (day<32)))
 {
 return true;
 }
 if ((
 (month==4) ||
 (month==6) ||
 (month==9) ||
 (month==11)
 ) && ((day>0) && (day<31)))
 {
 return true;
 }
 return false;
}


// check month
bool check_month(int month){
 if ((month>0) && (month<13)){
  return true;
 }else{
  return false;
 }
}

// check year
bool check_year(int year){

 if ((year>999) && (year < 10000)){
 return true;
 }else{

 return false;
 }

}
// is it leap year
bool check_leap_year(int year){
 if (((year % 4)==0) && ((year % 100)!=0)){
  return true;
 }else if ((year % 400)==0){
  return true;
 }else {
  return false;
 }


}

// get exact day from date
//
// http://en.wikipedia.org/wiki/Julian_day#Calculation
//
const char *get_day(int day, int month, int year){
  int JMD;
   JMD = (day + ((153 * (month + 12 * ((14 - month) / 12) - 3) + 2) / 5) +
     (365 * (year + 4800 - ((14 - month) / 12))) +
     ((year + 4800 - ((14 - month) / 12)) / 4) - 
    ((year + 4800 - ((14 - month) / 12)) / 100) + 
    ((year + 4800 - ((14 - month) / 12)) / 400)  - 32045) % 7;
 //cout << JMD;
 const char *weekday[] = {"Monday", 
   "Tuesday", 
   "Wednesday",
   "Thursday", 
   "Friday", 
   "Saturday", 
   "Sunday"};
 return weekday[JMD];
}


// main trigger function
main(){
 // instalise variable
 int year, month, date, x, y;


 cout << "\n[+] Welcome To Day Finder Script.";

 // Take Inputs
 cout << "\n[+] Please Enter The Year [YYYY] : ";
 cin >> year;
 cout << "\n[+] Verifying Year Format [YYYY] : ";

 // verify year
 if (check_year(year)){
  cout << "\n\t[-] Year Verified";
 }else{
  cout << "\n\t [-] Wrong Year Format\n";
  exit(0);
 }


 cout << "\n[+] Please Enter The Month  [MM] : ";
 cin >> month;

 // verify month
 if (check_month(month)){
  cout << "\n\t[-] Month Verified";
 }else{
  cout << "\n\t [-] Wrong Month Format";
  exit(0);
 }
 cout << "\n[+] Please Enter The Date   [DD] : ";
 cin >> date;


 // verify date
 if (check_date(date, month)){
  cout << "\n\t[-] Date  Verified\n\n";
 }else{
  cout << "\n\t [-] Wrong Date Format";
  exit(0);
 }
 cout << "[+] Date : " << date << ", Month : " << month << ", Year : " << year << " [ ";
 if (check_leap_year(year)){
  cout << "Leap Year" << " ]";
 }else{
  cout << "Not Leap Year" << " ]";
 }
 cout << "\n\t[-] Weekday : ";
 cout << get_day(date, month, year);
 cout << "\n\n";
}