array to string

[unstoppy]

Hey guys
I'm trying to convert to array of integers to string. You can see the function that I have created below. It works for an array with all one digit elements. eg-{1, 2, 3, 4}
but when there are two- or more digits number in that array the string will be with one digit element. for eg - {12, 3, 6}
the string will be [1,2,3,6]
Does anyone have solution to it? Is there any better way to convert int to string than using sstream?
Thx in advance :)

#include <iostream>
#include <sstream>
string toString(int a[], unsigned int len)
{
	string stray = "[";
	string helper = "";
	stringstream out;
	for (int j=0; j < len; j++){
		out << a[j];
		helper = out.str();
	}

	for (int i=0; i < ((helper.length())-1); i++){
		stray += helper[i];
		stray += ", ";
	}
	stray += helper[helper.length()-1];
	stray += "]";

	return stray;


}

int main()
{
int b[] = {1, 2, 3, 4, 5, 6, 9, 21};
cout <<toString(b, 8);
}

[JLBorges]

You don't really need that helper, do you?

std::string toString( const int a[], std::size_t len )
{
    if( len == 0 ) return "[]" ;

    std::string result = "[" ;
    for( std::size_t i = 0 ; i < len ; ++i )
    {
        std::ostringstream stm ;
        stm << a[i] ;
        result += stm.str() + ", " ;
    }

    // remove the last ", " and add a ']'
    return result.substr( 0, result.size()-2 ) + ']' ;
}

[unstoppy]

Thx mate!
the "helper" is indeed not required. "helper" can only help when that is a one digit array :)

[JLBorges]

My bad; should have lifted the stream out of the loop.

std::string toString( const int a[], std::size_t len )
{
    if( len == 0 ) return "[]" ;

    std::ostringstream stm ;
    stm << '[' ;
    for( std::size_t i = 0 ; i < len ; ++i ) stm << a[i] << ", " ;

    std::string result = stm.str() ;
    // remove the last ", " and add a ']'
    return result.substr( 0, result.size()-2 ) + ']' ;
}