Thread: comparing char array

  1. #1
    Registered User
    Join Date
    Mar 2020

    comparing char array

    if I have

    char a[4];
    char b[4];

    is the following legal in c:

    if (b == a)

    These are NOT character strings just character arrays

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Legal - yes
    Useful - no
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    Programming Wraith GReaper's Avatar
    Join Date
    Apr 2009
    Indeed, using the equality operator on two arrays is perfectly valid C, although it would only produce the desired result if those two arrays were actually the exact same array in memory. That happens because C compares addresses (because the name of an array is interpreted as the address of its first element), not contents. If you want to compare the contents, you can use memcmp().
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