Thread: Printing pointers with printf()

  1. #1
    Registered User
    Join Date
    May 2008

    Question Printing pointers with printf()

    Hi there,

    I have done a program that at a certain point prints a pointer (char*), and it is compiling but it outputs this warning:
    vectorCaracteres.c:42: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘char *’
    Here is line 42:
    printf("PONTEIRO -> %d CARÁCTER -> %c\n", vector2[i], *vector2[i]);
    vector2 is declared as an char* vector:
    #define TAMANHO 7
    char* vector2 [TAMANHO];
    I changed line 42 to the following:
    printf("PONTEIRO -> %d CARÁCTER -> %c\n", (int)vector2[i], *vector2[i]);
    and in fact it is working (does not display the warning anymore). Since I don't know if the pointer values displayed are ok, could someone please tell me if I did the right choice or am I going the wrong way?

    If someone could answer me I would be very appreciated :]

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    To print a pointer, use
    printf("PONTEIRO -> %p CARÁCTER -> %c\n", (void*)vector2[i], *vector2[i]);
    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
    Registered User
    Join Date
    May 2008
    ok, many arigatos!

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