question about arrays

This is a discussion on question about arrays within the C Programming forums, part of the General Programming Boards category; i was wondering how i could reset an array, I have a character array that i need to reuse over ...

  1. #1
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    question about arrays

    i was wondering how i could reset an array, I have a character array that i need to reuse over and over again in a funciton, so I would like to blank it out I've been trying things like

    Code:
    word[] = {}
    
    word = { '\0'}
    But I just get error messages, I just want it to be empty so i can use it again

    thank you

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    i mean....
    Code:
    word [] = {'\0'}

  3. #3
    cwr
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    Use the memset function or a for loop for each element. You can't zero out an array with = except at initalisation.

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    thanks for the tip, i've never used memset before, i looked it up but don't understand how to implement it

    the definition I found looks like this

    void *memset(void *s, int c, size_t n);

    i've tried

    Code:
    memset(word,Max_size);
    and different variations of that, but get errors

    thank you

  5. #5
    cwr
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    from the definition you can see that memset takes 3 parameters, but you are passing it two.

    You seem to be passing the first and third parameters, but not the second. The second is the value. In the case of initalising to 0:
    Code:
    memset(word, 0, Max_size);

  6. #6
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    Quote Originally Posted by panfilero
    i mean....
    Code:
    word [] = {'\0'}
    would set the string to zero length string.Incase you dont want to change all the bytes means if in a function you want to fill the array word by just checking if the word array is empty.Just setting the first will be efficient
    Code:
    word[0]='\0';
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    would set the string to zero length string.
    A zero-length string, but a 1 length array. Assuming a semicolon was added.

    BTW, memset() is in <string.h>.
    dwk

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