type cast or conversion?

This is a discussion on type cast or conversion? within the C Programming forums, part of the General Programming Boards category; I want to read 4 char from a file and then store them at an array so i do: fread ...

  1. #1
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    type cast or conversion?

    I want to read 4 char from a file and then store them at an array so i do:

    fread (&i_r_quan, sizeof (char), 4, f_ptr);

    After checking these characters I need to store them in a structure as an integer.
    Does the following work by type conversion or do I have to type cast i_r_quan to an integer first:

    strcpy (i_r_quantity, i_r_quan [4]);

    Also will a null be added to i_r_quan automatically when I read 4 characters into the array?:

    CHEERS!!

  2. #2
    ATH0 quzah's Avatar
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    Code:
    union conversion{
        char array[4];
        int i;
    };
    Try that on for size.

    Quzah.

  3. #3
    and the hat of int overfl Salem's Avatar
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    > Does the following work by type conversion or do I have to type cast i_r_quan to an integer first:
    No, you need to use a routine like atoi or sscanf

    If i_r_quantity is an int, then
    sscanf( i_r_quan, "%d", &i_r_quantity );

    > Also will a null be added to i_r_quan automatically when I read 4 characters into the array
    No - you need to do this bit yourself as well

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