The difference between Integer and Natural number
When used as nouns, integer means a number that is not a fraction, whereas natural number means a positive integer {1, 2, 3, ...}.
check bellow for the other definitions of Integer and Natural number
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Integer as a noun (arithmetic):
A number that is not a fraction; an element of the infinite and numerable set {..., -3, -2, -1, 0, 1, 2, 3, ...}.
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Natural number as a noun (mathematics):
a positive integer {1, 2, 3, ...}
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Natural number as a noun (mathematics):
a non-negative integer {0, 1, 2, ...}