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# semihozsoy's solution

## to Leap in the Swift Track

Published at Apr 22 2021 · 1 comment
Instructions
Test suite
Solution

Given a year, report if it is a leap year.

The tricky thing here is that a leap year in the Gregorian calendar occurs:

on every year that is evenly divisible by 4
except every year that is evenly divisible by 100
unless the year is also evenly divisible by 400

For example, 1997 is not a leap year, but 1996 is. 1900 is not a leap year, but 2000 is.

If your language provides a method in the standard library that does this look-up, pretend it doesn't exist and implement it yourself.

## Notes

Though our exercise adopts some very simple rules, there is more to learn!

For a delightful, four minute explanation of the whole leap year phenomenon, go watch this youtube video.

## Setup

Go through the project setup instructions for Xcode using Swift:

http://exercism.io/languages/swift
http://exercism.io/languages/swift/tests

Notably from the source directory:

swift test runs tests
swift package generate-xcodeproj creates an Xcode project

## Source

JavaRanch Cattle Drive, exercise 3 http://www.javaranch.com/leap.jsp

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

### LeapTests.swift

import XCTest
@testable import Leap

class LeapTests: XCTestCase {

func testVanillaLeapYear() {
let year = Year(calendarYear: 1996)
XCTAssertTrue(year.isLeapYear)
}

func testAnyOldYear() {
let year = Year(calendarYear: 1997)
XCTAssertFalse(year.isLeapYear)
}

func testCentury() {
let year = Year(calendarYear: 1900)
XCTAssertFalse(year.isLeapYear)
}

func testExceptionalCentury() {
let year = Year(calendarYear: 2400)
XCTAssertTrue(year.isLeapYear)
}

static var allTests: [(String, (LeapTests) -> () throws -> Void)] {
return [
("testVanillaLeapYear", testVanillaLeapYear),
("testAnyOldYear", testAnyOldYear),
("testCentury", testCentury),
("testExceptionalCentury", testExceptionalCentury),
]
}
}

### LinuxMain.swift

import XCTest
@testable import LeapTests

XCTMain([
testCase(LeapTests.allTests),
])
//Solution goes in Sources

struct Year {
let calendarYear : Int

var isLeapYear:Bool{

if calendarYear % 4 == 0 && calendarYear % 100 == 0 {
if calendarYear % 400 == 0 {
print("\(calendarYear) is leap year")
}
else {
print("\(calendarYear) is not leap year")
}
}
else if calendarYear % 100 == 0 && calendarYear % 400 == 0 {
print("\(calendarYear) is leap year")
}

else {
print("\(calendarYear) is not leap year")
}

return true
}

}