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A year is a leap year if it is divisible by 4.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A year is a leap year if it is divisible by . But a century year (divisible by ) is a leap year only if it is also divisible by . Write the condition. Which of , and are leap years?
Need a reminder? The key ideaShow
and comes before or. Use brackets to say what you mean.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
The condition. Divisible by 4, and (not a century, or divisible by 400):
year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)
- : divisible by 4, and not a century. Leap year.
- : divisible by 4 and a century, but leaves a remainder. Not a leap year.
- : divisible by 4, a century, and divisible by 400. Leap year.
Note. The brackets matter. Without them, and is worked out before or, and the answer would be wrong.
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