concatenate string and variable problem

[develturk]

#include <iostream>
#include <fstream>

using namespace std;

class Myclass {
public:
string word[11];
string myFiles[11];
Myclass() { // Construct
myFiles[0] = "test.php";
myFiles[1] = "error.php";
myFiles[2] = "x.php";
myFiles[3] = "dialog.html";
myFiles[4] = "z.php";
myFiles[5] = "close_icon.gif";
myFiles[6] = "config.php";
myFiles[7] = "g.php";
myFiles[8] = "sabre";
myFiles[9] = "index.html";
myFiles[10] = "errorw.php";
}
public:
bool file_exists (const char *filename);
string* run_app();
// const char the_array[]
// int billy[] = { 16, 2, 77, 40, 12071 }
};

bool Myclass::file_exists (const char *filename)
{
ifstream myfile(filename);
if (myfile.good())
{
return true;
}

return false;
}

string* Myclass::run_app ()
{
for (int $i = 0; $i < 10; ++$i)
{
if(this->file_exists("/var/www/myFiles[$i]")) // problem in here i need to concatenate string and variable !!
{
word[$i] = myFiles[$i] + " exist !";
}
else
{
word[$i] = myFiles[$i] + " not exist !";
}
}

// word[0] = "Heheheh";
// word[1] = "oheyuuuuu";

return word ;
}

int main ()
{
Myclass b;

string* myArray = b.run_app();

for (int $i = 0; $i < 10; $i++) //go through all elements
cout << $i <<'\t' << myArray[$i] << endl; //print indexnumber and value

return 0;

cout << "The result is FALSE";
return 0;
}

Hi i need to Myclass::run_app() function i need to concatenate string and variable in this line ..

"this->file_exists("/var/www/myFiles[$i]")"

could help me someone ?
thanks.

[cire]

#include <string>
#include <sstream>

using namespace std;

string* Myclass::run_app ()
{
	for (int $i = 0; $i < 10; ++$i)
	{
		ostringstream fname ;
		fname << "/var/www/" << myFiles[$i ] ;

		if(file_exists(fname.str().c_str())) // problem in here i need to concatenate string and variable !!
		{
			word[$i] = myFiles[$i] + " exist !";
		}
		else
		{
			word[$i] = myFiles[$i] + " not exist !";
		}
	}

	// word[0] = "Heheheh";
	// word[1] = "oheyuuuuu";

	return word ;
}

What's with the $?