[Mingw-users] Re: Append an int to an string

[Martin F. <mar...@gm...>]

Hi,

> I'm trying to program a mehtod which returns an string. More or less it i=
s
> something like that:
> ...
> It doesn't work. I thought the "+" operator was going to convert the int
> values to strings in order perform de concatenation, but it seems this
> is not the way it works. How can I construct this string then?

No, it doesn't convert the int values into strings. It merely appends them =
as characters to the string.

Here is my example to implement what you tried:

#include <string>
#include <iostream>
#include <sstream>

using namespace std;

string convert_int_array(int int_array[], int iCount)
{
/*original code
	string sOutput;

	for(int i=3D0; i<iCount; i++) {
		sOutput +=3D int_array[i];
	}
*/

	 // print array content into a output string stream
	ostringstream out;

	for(int i=3D0; i<iCount; i++) {
		out << int_array[i] << " ";
	}

	return out.str();
}

int main()
{
	int array[] =3D {1, 3, 5, 7, 11, 13, 17};

	string str =3D convert_int_array(array, sizeof(array)/sizeof(int));

	cout << str << endl;

	return 0;
}


To format numeric values into a string representation using C++, you should=
 use the stream classes. My example function first prints your integer valu=
es separated by space characters into a ostringstream object. After that it=
 converts the stream buffer to a string object and returns that to be proce=
ssed further.

Regards,

   Martin