dev-cpp-users

[Dev-C++] Integer to std::string?

[Jason H. <jas...@bt...>]

Hi,

I'm a bit rusty in my C++ and I just cannot seem to find a way of
initialising a std::string with an integer value. While I can write a
function to do it quite easily I had thought that there was a either a
standard function or member of string that would do it, but I can't find
one. I might be missing something with being tired of course. I know in
future I will want to be doing similar with float's too, and I hope there is
an easy way of doing that. I don't want to have to reinvent the wheel if I
can avoid it.

I remember with AnsiString in BCB or (or Delphi) would take it as a
constructor argument, but std::string doesn't seem to have that ability.

Thanx for any help, Jason.

RE: [Dev-C++] Integer to std::string?

[Ioannis V. <no...@ya...>]

I do not know string's member functions yet, but i know C well and you
can use sprintf() to convert a number to a C string, so:

#include <cstdio>
#include <iostream>
#include <string>

int main()
{
 using namespace std;

 char array[100];
 
 sprintf(array, "This is a string with numbers, %d is integer, %f is
float", 2, 5.5);

 string s=array;
 
 cout<<s<<endl;
}


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys



> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Jason Hardman
> Sent: Friday, September 21, 2001 5:31 AM
> To: Dev-C++
> Subject: [Dev-C++] Integer to std::string?
> 
> 
> Hi,
> 
> I'm a bit rusty in my C++ and I just cannot seem to find a 
> way of initialising a std::string with an integer value. 
> While I can write a function to do it quite easily I had 
> thought that there was a either a standard function or member 
> of string that would do it, but I can't find one. I might be 
> missing something with being tired of course. I know in 
> future I will want to be doing similar with float's too, and 
> I hope there is an easy way of doing that. I don't want to 
> have to reinvent the wheel if I can avoid it.
> 
> I remember with AnsiString in BCB or (or Delphi) would take 
> it as a constructor argument, but std::string doesn't seem to 
> have that ability.
> 
> Thanx for any help, Jason.
> 
> 
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> 

Re: [Dev-C++] Integer to std::string?

[Jason H. <jas...@bt...>]

Thanks for that, I had forgotten about sprintf(). I have to say it's not an
ideal solution. It seems odd that the idea of converting from numbers wasn't
put into string. I think I may still write some kind of function to convert
"tostring", using sprintf is a more messy solution for my purpose.

I'll be keeping my eye out for alternatives still though.

Thanx, Jason.


----- Original Message -----
From: "Ioannis Vranos" <no...@ya...>
To: <dev...@li...>
Sent: Friday, September 21, 2001 9:23 AM
Subject: RE: [Dev-C++] Integer to std::string?


> I do not know string's member functions yet, but i know C well and you
> can use sprintf() to convert a number to a C string, so:
>
> #include <cstdio>
> #include <iostream>
> #include <string>
>
> int main()
> {
>  using namespace std;
>
>  char array[100];
>
>  sprintf(array, "This is a string with numbers, %d is integer, %f is
> float", 2, 5.5);
>
>  string s=array;
>
>  cout<<s<<endl;
> }
>
>
> Ioannis
>
> * Ioannis Vranos
> * Programming pages: http://www.noicys.f2s.com
> * Alternative URL: http://run.to/noicys

RE: [Dev-C++] Integer to std::string?

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li...=20
> [mailto:dev...@li...] On Behalf=20
> Of Jason Hardman
> Sent: Friday, September 21, 2001 7:59 PM
> To: dev...@li...
> Subject: Re: [Dev-C++] Integer to std::string?
>=20
>=20
> Thanks for that, I had forgotten about sprintf(). I have to=20
> say it's not an ideal solution. It seems odd that the idea of=20
> converting from numbers wasn't put into string. I think I may=20

I did not say that the idea of converting from numbers to string isn't
implemented in string, i said that i do not know it yet. :)

> still write some kind of function to convert "tostring",=20
> using sprintf is a more messy solution for my purpose.
>=20
> I'll be keeping my eye out for alternatives still though.
>=20
> Thanx, Jason.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

Re: [Dev-C++] Integer to std::string?

[Jason H. <jas...@bt...>]

I've been looking at it myself to, and AFAICT there isn't standard string
support for converting from int. None of the string members listed in "C++
The Complete Reference" do it.

I have found an alternative way of doing what sprintf does, which is more
C++ like, by using an Array Based Output Stream. e.g.

#include <stdio.h>
#include <stdlib.h>
#include <strstream>
#include <iostream>
#include <string>

int main(int argc, char *argv[])
{
    using namespace std;

    char str[80];
    ostrstream outs(str, sizeof(str));
    string mystring;

    outs << "An int " << 1024 << " or a float " << 1.234 << "." << ends;

    mystring = str;

    cout << mystring << endl;

    system("PAUSE");

    return 0;
}

I tested it just in case, and it seems to work OK, but is also a long winded
way of doing things.

Jason.

----- Original Message -----
From: "Ioannis Vranos" <no...@ya...>
To: <dev...@li...>
Sent: Friday, September 21, 2001 8:24 PM
Subject: RE: [Dev-C++] Integer to std::string?


> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...] On Behalf
> Of Jason Hardman
> Sent: Friday, September 21, 2001 7:59 PM
> To: dev...@li...
> Subject: Re: [Dev-C++] Integer to std::string?
>
>
> Thanks for that, I had forgotten about sprintf(). I have to
> say it's not an ideal solution. It seems odd that the idea of
> converting from numbers wasn't put into string. I think I may

I did not say that the idea of converting from numbers to string isn't
implemented in string, i said that i do not know it yet. :)

> still write some kind of function to convert "tostring",
> using sprintf is a more messy solution for my purpose.
>
> I'll be keeping my eye out for alternatives still though.
>
> Thanx, Jason.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys


_______________________________________________
Dev-cpp-users mailing list
Dev...@li...
https://lists.sourceforge.net/lists/listinfo/dev-cpp-users