Hello,
Am trying to convert a string to float. Am using atof() for that purpose.
But the return value for atof is same for the string "0.0" and for some
invalid input "Invalid". Can any body suggest me the way to differentiate an
invalid float number string and a 0.0.
TIA,
Sreekanth.
6  4495 
Thanks, But it also returns 0 in both cases.. I want to differentiate an
invalid string and a Zero string in a string to float conversion mechanism.
"Irrwahn Grausewitz" <ir*******@free net.de> wrote in message
news:72******** *************** *********@4ax.c om... "Sreekanth" <sr*******@yaho o.com> wrote:Hello,
Am trying to convert a string to float. Am using atof() for that purpose.
But the return value for atof is same for the string "0.0" and for some
invalid input "Invalid". Can any body suggest me the way to differentiate
aninvalid float number string and a 0.0.
Instead of atof use strtod.
Regards
--
Irrwahn Grausewitz (ir*******@free net.de)
welcome to clc: http://www.ungerhu.com/jxh/clc.welcome.txt
clc faq-list : http://www.faqs.org/faqs/C-faq/faq/
clc OT guide : http://benpfaff.org/writings/clc/off-topic.html
Sreekanth <sr*******@yaho o.com> wrote: "Irrwahn Grausewitz" <ir*******@free net.de> wrote in message
news:72******** *************** *********@4ax.c om... "Sreekanth" <sr*******@yaho o.com> wrote: >Hello,
>Am trying to convert a string to float. Am using atof() for that purpose.
>But the return value for atof is same for the string "0.0" and for some
>invalid input "Invalid". Can any body suggest me the way to differentiate an >invalid float number string and a 0.0.
Instead of atof use strtod.
Thanks, But it also returns 0 in both cases.. I want to differentiate an
invalid string and a Zero string in a string to float conversion mechanism.
Well, that's why you should use strtod():
double strtod(const char *nptr, char **endptr);
If you got an illegal argument *endptr and nptr are identical after
the call of the function. On legal input what endptr points to is
a pointer to the part of the input string where the conversion
stopped and it differs from nptr.
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de
Thanks Gentleman.. Working..
<Je***********@ physik.fu-berlin.de> wrote in message
news:c5******** ****@uni-berlin.de... Sreekanth <sr*******@yaho o.com> wrote: "Irrwahn Grausewitz" <ir*******@free net.de> wrote in message
news:72******** *************** *********@4ax.c om... "Sreekanth" <sr*******@yaho o.com> wrote:
>Hello,
>Am trying to convert a string to float. Am using atof() for that
purpose. >But the return value for atof is same for the string "0.0" and for
some >invalid input "Invalid". Can any body suggest me the way to
differentiate an >invalid float number string and a 0.0.
Instead of atof use strtod. Thanks, But it also returns 0 in both cases.. I want to differentiate an
invalid string and a Zero string in a string to float conversion
mechanism.
Well, that's why you should use strtod():
double strtod(const char *nptr, char **endptr);
If you got an illegal argument *endptr and nptr are identical after
the call of the function. On legal input what endptr points to is
a pointer to the part of the input string where the conversion
stopped and it differs from nptr.
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de
Sreekanth wrote:
Am trying to convert a string to float. Am using atof() for that
purpose. But the return value for atof is same for the string "0.0"
and for some invalid input "Invalid". Can any body suggest me the
way to differentiate an invalid float number string and a 0.0.
strtod();
--
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
In <c5**********@n ews.mch.sbs.de> "Sreekanth" <sr*******@yaho o.com> writes: Thanks, But it also returns 0 in both cases..
It also provides enough clues to make the disambiguation trivial.
I want to differentiate an
invalid string and a Zero string in a string to float conversion mechanism.
Either use the clues provided by strtod, or use atof and do some minimal
parsing of the string yourself, when the result of the conversion is 0.
Dan
"Irrwahn Grausewitz" <ir*******@free net.de> wrote in message
news:72******* *************** **********@4ax. com... "Sreekanth" <sr*******@yaho o.com> wrote: >Hello,
>Am trying to convert a string to float. Am using atof() for that purpose.
>But the return value for atof is same for the string "0.0" and for some
>invalid input "Invalid". Can any body suggest me the way to differentiatean >invalid float number string and a 0.0.
Instead of atof use strtod.
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Drew |
last post by:
Hi:
I'm having trouble getting atof() to accurately convert "3.1"
Any ideas?
Thank you,
|
by: Sreekanth |
last post by:
Hello,
Am trying to convert a string to float. Am using atof() for that purpose.
But the return value for atof is same for the string "0.0" and for some
invalid input "Invalid". Can any body suggest me the way to differentiate an
invalid float number string and a 0.0.
TIA,
Sreekanth.
|
by: XZ |
last post by:
Hi everyone, this is really confusing to me:
#include <stdio.h>
main(int argc, char **argv) {
printf("argv = %f\n",(double)atof(argv));
printf("argv = %d\n\n",atoi(argv));
}
$ a.out a
argv = 97.000000
|
by: Trond Valen |
last post by:
Hi!
Stupid atof, it returns 0.0 when it tries to parse something like
"fish". So I don't know whether the number was really 0 or a string that
couldn't be parsed. Is there a better way to do this?
Trond Valen
|
by: oksuresh |
last post by:
Hi talents,
I have noticed that atof() function approximates the string I pass to
it.
when I use atof() , as atof(" 184.64")
and it returns 184.63999999999
But I would like to have the exact value that is passed.
| | |
by: tjay |
last post by:
Hi. I wrote some code using sprintf and atof to store a double as a
string of fixed length and to convert it back to a double variable. The
string is stored in a char buffer global variable. I'm afraid it might
contain bugs though.
If I serialize a double, I get a string of the format
"-1.0000000000000000e+212". This string gets stored in the buffer.
Then, to convert it back into a double, I pass it to the atof function.
The problem...
|
by: sharmaharish |
last post by:
I need a conversion function that converts values from string to a
particular type. For this I have a template function that looks like
this ...
template<class T>
T value(const string& s)
{
istringstream(s);
T val;
is >val;
|
by: lcw1964 |
last post by:
Greetings again,
I will burden the group with yet another tenderfoot question, but since
conscientious googling hasn't yield a lucid answer I thought I would
risk the shortcut of asking here since I am so very keen to learn to
code in standard C.
Could someone tell me the long double equivalent of atof()? I was
getting some peculiar behaviour in a little bit of math code I am
working with. I thought the problem was in the math...
|
by: allexander |
last post by:
Hello !
I need to convert a string like
string number = "1235646.5678"
to any floating point number x
(double x or float x)
I have used earlier the function atof()
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| | |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| | |
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
