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### 5.27 C++ Style Comments

In GNU C, you may use C++ style comments, which start with ‘`//`’ and continue until the end of the line. Many other C implementations allow such comments, and they are included in the 1999 C standard. However, C++ style comments are not recognized if you specify an `-std` option specifying a version of ISO C before C99, or `-ansi` (equivalent to `-std=c89`).