Which of the following is invalid C++ comment statement ?

Question

Accepted Answer

The correct option is (3):
The statement /*Comment*\ is an invalid C++ comment because it attempts to use a multi-line, C-style comment but fails to provide the correct closing delimiter. A valid C-style comment must start with the sequence /\* and be terminated by the exact sequence \*/. In the given option, the comment is closed by \*, which is not recognized as a comment terminator. This missing \*/ sequence results in an unterminated comment error, as the compiler will incorrectly try to read all subsequent code as part of this unfinished comment block. Correct syntax is a fundamental rule in C++ that must be followed for the program to compile successfully.

The incorrect option is (1):
The comment /*//Comment/*/ is a perfectly valid C-style multi-line comment. A C-style comment begins with /\* and ends at the first occurrence of \*/. All characters between these two delimiters, including the single-line comment markers (//) and the other block comment delimiters, are treated as plain text and are entirely ignored by the compiler during the preprocessing phase. This demonstrates that C-style comments do not allow for nesting, but they can contain other comment symbols without issue.

The incorrect option is (2):
The statement //*Comment*/ is a valid C++ single-line comment. The comment is initiated by the // sequence, after which the compiler treats every subsequent character on that line as part of the comment, until the physical end of the line. Therefore, the characters /*Comment*/ are simply ignored as part of the comment text. In single-line comments, the block comment delimiters /\* and \*/ have no special function.

The incorrect option is (4):
The statement //Comment is the standard and simplest form of a C++ single-line comment. This comment style is extremely common for short, contextual notes and begins with two forward slashes. The compiler correctly ignores all characters that follow // up to the end of the line. This is a universally recognized and valid comment syntax in C++ programming.