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From: "Richard Stanton" <stanton AT haas DOT berkeley DOT edu>
To: "Cygwin" <cygwin AT sources DOT redhat DOT com>
Subject: Bug reading floating point numbers in gcc 2.95.3-4
Date: Sat, 19 May 2001 12:56:24 -0700
Message-ID: <LNBBKMIKMNGEJNEJICPHGEKJFBAA.stanton@haas.berkeley.edu>
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The fscanf function in gcc 2.95.3-4 seems to ignore the decimal point in
floating point input fields. For example, create a file containing just the
following two numbers, say test.prn:

   26.28       2.34

Now compile and run the following program (testread.c):

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

char fileName[] = "test.prn";
double input1, input2;

int main(int argc, char *argv[])
{

    FILE *fpin0;

    if (((fpin0 = fopen(fileName, "r")) != NULL) &&
        (fscanf(fpin0, "%lf %lf", &input1, &input2) == 2)) {
        printf("Input line = %15.7f %15.7f\n", input1, input2);
    } else printf("Error\n");
    return 0;
}

and this is what happens:

c:\projects\leases>gcc -v
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-4/specs
gcc version 2.95.3-4 (cygwin special)

c:\projects\leases>gcc -o testread testread.c

c:\projects\leases>testread
Input line =    2628.0000000     234.0000000

The numbers were read as if they had no decimal points in them. This doesn't
help with the execution of my code...

Is there something wrong with my gcc setup, did I make an error in my code,
or is this a bug?

Thanks.

Richard Stanton


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