I had trouble with a code i was writing... the snippet i'm having trouble with is the following:
int main(void) { double h, r;
printf("Enter the height and radius: "); scanf("%f %f", &h, &r); printf("%f %f\n", h, r);
return 0;
Quote:
}
It works with "int" variables (int h, r; and %d formats) but it refuses to work with "double"...
I'm not getting an error but i do get junk as output. someone help!
jim
Wed, 24 Oct 2001 03:00:00 GMT
Jarmo Tiittane #2 / 8
Newbie: Trouble with scanf - HELP!!!
Hi Jim!
If you use double then try to use %lf instead of %f, because lf means long float
Quote:
> I had trouble with a code i was writing... the snippet i'm having > trouble with is the following:
> int main(void) > { > double h, r;
> printf("Enter the height and radius: "); > scanf("%f %f", &h, &r); > printf("%f %f\n", h, r);
> return 0; > }
> It works with "int" variables (int h, r; and %d formats) > but it refuses to work with "double"...
> I'm not getting an error but i do get junk as output. > someone help!
> jim
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Wed, 24 Oct 2001 03:00:00 GMT
Martin Ambuh #3 / 8
Newbie: Trouble with scanf - HELP!!!
Quote:
> I had trouble with a code i was writing... the snippet i'm having > trouble with is the following:
> int main(void) > { > double h, r;
> printf("Enter the height and radius: "); > scanf("%f %f", &h, &r);
Apart from the general advice that you should always fflush(stdout) after prompts not terminated with '\n' and never use scanf() directly, even if you go the safer fgets()/sscanf() route, the specifier for double in *scanf() is %lf.
Quote:
> printf("%f %f\n", h, r);
> return 0; > }
> It works with "int" variables (int h, r; and %d formats) > but it refuses to work with "double"...
> I'm not getting an error but i do get junk as output. > someone help!
> jim
--
Wed, 24 Oct 2001 03:00:00 GMT
Lawrence Kir #4 / 8
Newbie: Trouble with scanf - HELP!!!
Quote:
>This is a multi-part message in MIME format. >--------------14783CA80A870E50ECCD6773 >Content-Type: text/plain; charset=us-ascii >Content-Transfer-Encoding: 7bit
>Hi Jim!
>If you use double then try to use %lf instead of %f, because lf means >long float
But only in scanf(), %f is correct for double in printf().
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Wed, 24 Oct 2001 03:00:00 GMT
ji #5 / 8
Newbie: Trouble with scanf - HELP!!!
Thanks a bunch for all the replies...
one more question.... I have the second edition of K&R. Is there a mention to use %lf for scanf() in there??
just curious. would like to make a note of the page if it exists for later reference.
thanks.
jim
Thu, 25 Oct 2001 03:00:00 GMT
Lawrence Kir #6 / 8
Newbie: Trouble with scanf - HELP!!!
Quote:
>Thanks a bunch for all the replies...
>one more question.... I have the second edition of K&R. >Is there a mention to use %lf for scanf() in there??
>just curious. would like to make a note of the page if it exists for >later reference.
Pages 158 and 245. These can be found simply by looking up scanf in the index.
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Thu, 25 Oct 2001 03:00:00 GMT
bowma #7 / 8
Newbie: Trouble with scanf - HELP!!!
Quote:
> one more question.... I have the second edition of K&R. > Is there a mention to use %lf for scanf() in there??
In Chapter 7, %lf is shown with scanf. It is just an example, however, and afaik there is no explicit explanation of why it must be used. The material on specifiers does not cover the issue.
Newbie: Trouble with scanf - HELP!!!