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From: MARWK@levels.sait.edu.au
Newsgroups: comp.lang.c
Subject: Re: scanf doesn't work for variables of type double
Message-ID: <1691@levels.sait.edu.au>
Date: 18 Sep 89 10:29:41 GMT
References: <12988@uhnix1.uh.edu>
Organization: Sth Australian Inst of Technology
Lines: 25

In article <12988@uhnix1.uh.edu>, jsmng@csune.cs.uh.edu writes:
> I used the following program trying to read in 5 numbers interactively.
> As a test, I typed in 1.0 1.0 1.0 1.0 1.0 as input but the output is
> about 0.47 (approximately I forget the exact value but it is far from 1).
> When I changed the type of vec[] to be float. Everything is fine.
> Does anyone have any experience with this? According to K&R, %f for
> double should be allowed in scanf. We are running SunOS 4.0.1 and
> I think our C compiler follows the K&R standards (as opposed to
> ANSI).
> 
> #include <stdio.h>
> #define V 5
> main()
> {
>   double vec[V];
>   int i;
>   for (i=0;i<V;i++)
>     scanf("%f ",&vec[i]);
>   for (i=0;i<V;i++)
>     printf("%f ",vec[i]);
> }

You must use: scanf("%lf", &var) for doubles (long floats).

Ray