VC6: Convert String to Double in MFC Dialog

Question

4.00/5 (1 vote)

See more:

Hi,

I declared the variable as CString and I'm trying to convert it as double using the following statement.

double Principal      = _wtof(m_Principal);

but it gives the error as _wtof undeclared identifier
How can I solve this error. If my statement is wrong then tell me how to convert a string to double in MFC Dialog based application

Thanks.

Posted 20-Jun-11 1:48am

usha nelavalli

Updated 20-Jun-11 1:53am

Slacker007

v2

Add a Solution

Comments

Slacker007 20-Jun-11 7:55am

Edited for spelling, grammar, and readability.

4 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Resmi Anna · Answer 1 · 2011-06-20T02:02:00

Solution 2

use the function atof()

double Principal      = atof(m_Principal);

Posted 20-Jun-11 2:02am

Resmi Anna

Mohibur Rashid · Answer 2 · 2011-06-20T03:29:00

Solution 3

http://msdn.microsoft.com/en-us/library/hc25t012%28v=vs.80%29.aspx[^] try this

Posted 20-Jun-11 3:29am

Mohibur Rashid

Harmanjeet Singh · Answer 3 · 2011-06-20T10:47:00

Solution 4

we have a function name atoi() in the library.

atoi() -> Ascii to integer

.......var = (double)(atoi(variable)).........

hope rest you knows... :)

Posted 20-Jun-11 10:47am

Harmanjeet Singh

Niklas L · Answer 4 · 2011-06-20T20:56:00

Solution 5

The old C-conversion routines have their limitations.

It's better to use the C++ stream functionality to be able to catch errors.

Have a look at this post[^].

Posted 20-Jun-11 20:56pm

Niklas L