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At compile time, string literals are used to create an array of static storage duration of sufficient length to contain the character sequence and a terminating null character. String literals are usually referred to by a pointer to (or array of) characters. Ideally, they should be assigned only to pointers to (or arrays of) const char or const wchar_t. It is unspecified whether these arrays of string literals are distinct from each other. The behavior is undefined if a program attempts to modify any portion of a string literal. Modifying a string literal frequently results in an access violation because string literals are typically stored in read-only memory. (See undefined behavior 3332.)
Avoid assigning a string literal to a pointer to non-const or casting a string literal to a pointer to non-const. For the purposes of this rule, a pointer to (or array of) const characters must be treated as a string literal. Similarly, the returned value of the following library functions must be treated as a string literal if the first argument is a string literal:
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