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orion.a.smith@gmail.com apcsa-primitives > apcsaPrimitivesSignFlip
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Given a String containing an integer value, return a String representing the number with its sign flipped. Assume the input is a valid integer string (may already be negative or positive).


apcsaPrimitivesSignFlip("42") → "-42"
apcsaPrimitivesSignFlip("-100") → "100"
apcsaPrimitivesSignFlip("0") → "0"

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public String apcsaPrimitivesSignFlip(String str) { }

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