why doesnt this give me the float value that I need. How can I fix itCode:int main() { double x; char s[200]="22.453"; x=atof(s); printf("%lf",x); }
the atof function called I thought would take "22.453"
and get 22.453 and then let me put that into an integer.
You need to #include <stdlib.h>. And #include <stdio.h> while you're at it. (Why you need to be told this, I don't know...)
And also, atof is deprecated in favor of strtod. Replace with strtod(nptr, (char **)NULL);
System: Debian Sid and FreeBSD 7.0. Both with GCC 4.3.
Useful resources:
comp.lang.c FAQ | C++ FQA Lite
> And also, atof is deprecated in favor of strtod. Replace with strtod(nptr, (char **)NULL);
Actually, atof isn't deprecated with anything. It is still supported by the C standards.
Also, %lf is not the correct format for printing a float/double.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
For what it's worth, it is in BSD and OS X.Originally Posted by citizen
And at any rate, strtod is the better function.
(Also, gets is still supported by the C standards, so that's really a suboptimal argument to make.)
System: Debian Sid and FreeBSD 7.0. Both with GCC 4.3.
Useful resources:
comp.lang.c FAQ | C++ FQA Lite
returnsCode:#include <stdio.h> int main() { double x; char s[200]="22.453"; x=strtod(s, (char **)NULL); printf("%lf",x); }
-802490616.000000
can you show me a working solution to this...coz I tried strtod and atof..
..
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
Really? I've lost a little respect for both, then. They have no business "deprecating" completely standard language features.
Probably.And at any rate, strtod is the better function.
> Also, %lf is not the correct format for printing a float/double.
Then later, you repeat your original code
> printf("%lf",x);
Last chance saloon - drink up or leave town.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
so what should I use %f?
pretty interesting site Dave_Sinkula
Yes, %f is used with printf() for floats and doubles, while scanf() uses %f for floats and %lf for doubles.
dwk
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