abs() 함수가 구현된 방법 때문에, 괄호 안에 다른 함수를 쓰는 것을 피하세요. 잘못된 결과가 나올 수 있음.
abs(a++); // 이렇게 하지 마세요 - 잘못된 결과 나옴
abs(a); // 대신 이것을 사용하세요 -
a++; // 함수 밖에서 다른 수학
See also
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