C++17 init-statements for if and switch

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init-statements for if and
switch

표현식, 선언문 사용 가능. 무조건 ; 으로 끝나야함

조건문 안에 선언된 변수의 if, switch 문이 끝날때까지 유효하다
변경 코드

추가한 이유
if, switch 문 밖에서 조건으로 쓰기 위한 변수를 선언하면 if, switch 문이 끝나고 난
뒤에도 변수가 사라지지 않아 잘못 쓰일 여지가 있었다

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C++17 init-statements for if and switch

1. init-statements for if and switch

2. 표현식, 선언문 사용 가능. 무조건 ; 으로 끝나야함

3. 조건문 안에 선언된 변수의 if, switch 문이 끝날때까지 유효하다 변경 코드

4. 추가한 이유 if, switch 문 밖에서 조건으로 쓰기 위한 변수를 선언하면 if, switch 문이 끝나고 난 뒤에도 변수가 사라지지 않아 잘못 쓰일 여지가 있었다