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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6. 	public static void main (String[] args) throws java.lang.Exception
  7. 	{
  8. 	 int year=1901;
  9.     boolean isLeapYear=false;
  10.     int totalSundays=0;
  11.     int currentDay=2;//Starts on a Monday
  12.     while(year<=2000){
  13.         isLeapYear=false;
  14.         if((year%4)==0){
  15.             if((year%100)==0 && (year%400)==0){
  16.                 isLeapYear=true;
  17.             } else if((year%100)==0 && (year%400)!=0){
  18.                 isLeapYear=false;
  19.             } else {
  20.                 isLeapYear=true;
  21.             }
  22.         }
  23.         for(int month=1;month<=12;month++){
  24.             if(currentDay==7){
  25.                 totalSundays++;
  26.             }
  27.             if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12){
  28.             //January,March,May,July,August,October,December
  29.                 currentDay+=3;
  30.             } else if(month==4 || month==6 || month==9 || month==11){ 
  31.             //April,June,September,November
  32.                 currentDay+=2;              
  33.             } else if(month==2 && isLeapYear){
  34.             //February has 29 days in a Leap Year
  35.                 currentDay+=1;
  36.             } 
  37.  
  38.             if(currentDay>7){
  39.                 currentDay=currentDay-7;
  40.             }
  41.         }
  42.         year++;
  43.     }
  44.     System.out.println("The total number of Sundays that fell in the first of the month is: "+totalSundays);	
  45. 	}
  46. }
Success #stdin #stdout 0.03s 245632KB
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stdin
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Standard input is empty
stdout
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The total number of Sundays that fell in the first of the month is: 171
https://ideone.com/mh4MJ
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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