Pass by Reference with a pointer to char

This is a discussion on Pass by Reference with a pointer to char within the C Programming forums, part of the General Programming Boards category; Thanks everyone! I really appreciate the advice and assistance!...

  1. #16
    Registered User
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    Oct 2008
    Thanks everyone! I really appreciate the advice and assistance!

  2. #17
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    To be precise, a string literal is not a pointer, but an array. For example "hello" would be an array of 6 chars, including the null character that is automatically appended. Now, this is often only a pedantic difference since arrays are converted to pointers to their first element whenever necessary. One difference arises with the use of sizeof, e.g., sizeof("hello") is 6, but sizeof(char*) may well be 4 (or whatever is the size of a pointer to char).

    Another thing to note is that you can initialise a char array with a string literal, e.g.,
    char str[] = "hello world";
    here, str can safely be an array of non-const char since it is not a string literal, unlike:
    const char *ptr = "hello world";
    where ptr points to the first char of the string literal "hello world". So, it is perfectly fine to assign to str[0], but assigning to ptr[0] results in undefined behaviour.
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