Euler 19

gistfile1.txt

#!/usr/local/bin/node

// set up arrays for day names and number of days in month
days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
daysinmonth = [31,28,31,30,31,30,31,31,30,31,30,31]
daysinmonth_leapyear = [31,29,31,30,31,30,31,31,30,31,30,31] 

// enter starting day and date (monday = 1 in our array), also initials vars
// 1.1.1901 is a tuesday (2 in days array)- i figured that out using this program
// but using the info they gave us about 1/1/1900 being a monday.
day = 2; 
date= 1;
month = 1; 
year = 1901;
count = 0;
isleap = false;


// while loop counts up until these are all true
while ((date != 31 || month !=12 || year !=2000))
	{
	day +=1;
 	date +=1;
 	
 	if (date > daysinmonth[month-1] && isleap == false) 
 		{
 		month +=1;
 		date=1;
 		}
 	
 	if (date > daysinmonth_leapyear[month-1] && isleap == true)
 		{
 		month +=1;
 		date=1;
 		}
 	
 	if (month > 12)
 		{
 		year +=1;
 		month = 1;
 		}
 	
 	if (year%4==0)
 		{
 		isleap = true;
 		}
 	else
 		{
 		isleap = false;
 		}
 	
 	if (day%7 == 0 && date == 1)
 		{
 		count += 1;
 		}

// 	console.log	("today is " + month + "/" + date + "/" + year + " and it is a " + days[day%7]);
 	}	
 		
 console.log("There are " + count + " dates where the first of the month is on a Sunday in this range");