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char-1ee/is-integer.md

Created July 3, 2022 14:37
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is-integer.md

To check whether givn x is an integer,

  • In Java, take the decimal part using % 1 and then check if is 0:

    return (x + EPSILON) % 1 <= 2 * EPSILON; // caution on double type

  • In cpp, check by using x - int(x) == 0.

  • In Javascript, check by Number.isInteger().

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