정수=0,1,2,3,4,5,6,7,8,9,10.... 쭉~~~,-1,-2,-3,-4,-5,-6,-7,-8,-9,-10........쭉~~~ 자연수=1,2,3,4,5,6,7,8,9,10..... 쭉~~~ 따라서0은 정수에포함됩니다.
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