GCC supports three versions of the C standard, although support for the most recent version is not yet complete. The original ANSI C standard (X3.159-1989) was ratified in 1989 and published in 1990. This standard was ratified as an ISO standard (ISO/IEC 9899:1990) later in 1990. There were no technical differences between these publications, although the sections of the ANSI standard were renumbered and became clauses in the ISO standard. This standard, in both its forms, is commonly known as C89 , or occasionally as C90 , from the dates of ratification. The ANSI standard, but not the ISO standard, also came with a Rationale document. To select this standard in GCC, use one of the options -ansi , -std=c90 or -std=iso9899:1990 ; to obtain all the diagnostics required by the standard, you should also specify -pedantic (or -pedantic-errors if you want them to be errors rather than warnings). See Options Controlling C Dialect . Errors in the 1990 ISO C standard were cor
주석(comment)은 프로그램의 기능이나 동작을 메모해두는 문장이다. 컴파일러는 주석의 내용을 무시한다. 여러 줄 주석 시작 기호(/*)와 끝 기호(*/)는 반드시 쌍으로 사용되어야하며, 중복해서 사용되어서는 안된다. 1 /* 2 주석 3 */ 한 줄 주석 원칙적으로, 한 줄 주석문은 C++언어에서 지원되는 형식이다. 1 // 주석
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