Question

Basically if the year is divisible by 4( think year%4==0) it’s a leap year UNLESS its divisible by 100 in which case its not a leap year UNLESS its also divisible by 400 , in which case it is.

Write a program that evaluates the years from 1890 to 2017 and write out the year if it is a leap year. Otherwise do not write out anything.

Hints

1. Loops can begin at any integer(think begin at 1890; test will be year <=2017)
2. Use && and || to get desired result in the if statements
3. There is nothing to write out in the case its not a leap year. If none of the conditions for a leap year are true, the loop “block” would end and you would increment , test to see if less than 2017 and then evaluate the next year.

Here is what the output should look like

1892 is a leap year

1896 is a leap year

1904 is a leap year

1908 is a leap year

1912 is a leap year

1916 is a leap year

1920 is a leap year

1924 is a leap year

1928 is a leap year

1932 is a leap year

1936 is a leap year

1940 is a leap year

1944 is a leap year

1948 is a leap year

1952 is a leap year

1956 is a leap year

1960 is a leap year

1964 is a leap year

1968 is a leap year

1972 is a leap year

1976 is a leap year

1980 is a leap year

1984 is a leap year

1988 is a leap year

1992 is a leap year

1996 is a leap year

2000 is a leap year

2004 is a leap year

2008 is a leap year

2012 is a leap year

2016 is a leap year

Answer 1

Given in the question, if the year is divisible by 4( think year%4==0) it’s a leap year UNLESS its divisible by 100 in which case its not a leap year UNLESS its also divisible by 400 , in which case it is. Following is the code:

In Python

def check(year):
    if (year % 400) == 0:
        return True
        
    if (year % 100) == 0:
        return False
        
    if (year % 4) == 0:
        return True
        
    return False
 
for y in range(1890, 2018):
    if(check(y)):
        print(y, "is a leap Year")

In Java

public class MyClass {
    public static boolean check(int year)
    {
        if (year % 400 == 0)
            return true;
     
        if (year % 100 == 0)
            return false;
     
        if (year % 4 == 0)
            return true;
        
        return false;
    }
    
    
    public static void main(String args[]) {
      
      for(int i=1890; i<=2017; i++) {
          if(check(i)) {
               System.out.println(i + " is a leap year");
          }
      }
    }
}

In C++

#include <iostream>
using namespace std;

bool check(int year) 
{
    if (year % 400 == 0) 
        return true; 

    if (year % 100 == 0) 
        return false; 

    if (year % 4 == 0) 
        return true; 
    
    return false; 
} 
int main() {
    for(int i=1890; i<=2017; i++) {
        if(check(i)) {
            cout<<i<<" is a leap year\n";
        }
    }
}