What does "number must be an integer" infer?

I was asked to enter any amount. I entered 10 and then 15. Each time a notice popped up saying "number must be an integer."Idon't know what number I can chose between 1 and 20 to be an integer.
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1 Answer

sumthun rong with sumwon's program

integer=0, +-1, +-2, +-3...

10 is integer

15 is integer
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