Conversion from double to string (from newbie)

[Marco Traverso]

Hi all,
This may seem quite a basic question...
Is there a direct function to convert a double into a string? I'm used to
VBScript and it has the CStr function that does the job.

es. (vbScript)

Dim dN
Dim sString

dN =- Sqr(2)
sString = CStr(dN)

'sString returns "-1.4142135623731"

I've searched for a C / C++ function, and I found only the _ecvt
function (and other similar...).

Anyway they have slightly different input variables so the conversion is not
"automatic"

Is there a specific function or do I have to build my own?

Thank you in advance,

Marco

 

[lallous]

Hi all,
This may seem quite a basic question...
Is there a direct function to convert a double into a string? I'm used to
VBScript and it has the CStr function that does the job.

es. (vbScript)

Dim dN
Dim sString

dN =- Sqr(2)
sString = CStr(dN)

'sString returns "-1.4142135623731"

I've searched for a C / C++ function, and I found only the _ecvt
function (and other similar...).

Anyway they have slightly different input variables so the conversion is not
"automatic"

Is there a specific function or do I have to build my own?

Thank you in advance,

Marco

Hello,

Checkout the sprintf() function.

 

[Marco Traverso]

Thank you Elias!

Marco

Hello,

Checkout the sprintf() function.

 

[Thierry Miceli]

Is there a direct function to convert a double into a string?
You can use string streams to do so:

#include <sstream>

std:stringstream ostr;

double d = 123.456;
ostr << d;
cout << ostr.str();


Thierry

 

[Jon Bell]

This may seem quite a basic question...

Yes, in fact it's in the FAQ. ;-)

Is there a direct function to convert a double into a string?

There is no standard function to convert a double into a variable of the
standard 'string' data type, but you can easily write one to do so. See

<http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-38.1>

 

[Marco Traverso]

Thank you all for your replies!
I didn't know about the FAQ, so the next time I'll search through them
before posting!

Thanx again,

Marco