Subj : Re: directly inputting numbers
To   : borland.public.cpp.borlandcpp
From : waking@idirect.com (Wayne A. King)
Date : Fri Jul 18 2003 07:51 pm

On 17 Jul 2003 09:42:06 -0700, "Michael Fruchter" <mfruchtr@yahoo.com> wrote:

>Am I correct to conclude that
>there is no way to directly read in the text as a number? 
>(i.e., by telling it to read a certain amount of places) 

You can use fscanf() and the width specifier to read a specific
number of characters for each number.

>is it possible to read the file directly 
>into the data array (without first reading the file into the buffer string)?

Yes. See if this example comes close to what you want.
(N.B. - Error checking kept to a minimum. Beef it up!)

Create a text file named "nums.txt" with lines such as:
12345678111122223333444455556666777788889999
00010002000300040005000600070008

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i, ret;
    long numary[20] = {0};
    FILE *fp = fopen("nums.txt", "rt");
    if(!fp)
        {
        fprintf(stderr, "Can't open input file!\n");
        return EXIT_FAILURE;
        }
    for(i=0; i<sizeof numary / sizeof(long); ++i)
        {
        ret = fscanf(fp, "%4ld", &numary[i]);
        if(!ret || ret == EOF) break;
        }
    if(!(ret == EOF))
        {
        fprintf(stderr, "WARNING! Reading ended before EOF!\n");
        }
    for(i=0; i<sizeof numary / sizeof(long); ++i)
        {
        printf("%ld\n", numary[i]);
        }
    fclose(fp);
    return EXIT_SUCCESS;
}


--
Wayne A. King 
(ba994@torfree.net, wayne.king@ablelink.org, 
 waking@idirect.com, Wayne_A_King@compuserve.com)

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