This is just one of many possible solutions:
whenclickedaskEnter the year and I will tell you if it's a leap year or not:andwaitsetyeartoanswerifnotyearmod4=0thensayjoinyear is not a leap year!elseifnotyearmod100=0thensayjoinyear is a leap year!elseifnotyearmod400=0thensayjoinyear is not a leap year!elsesayjoinyear is a leap year!
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