在c++ 怎樣將一個integer放入string

string printSS = ""; // should initialize first
char buffer[1024]; // create a char* buffer
for (int e = 0; e < copyGuesse; e++)
{
itoa(e, buffer, 10); // convert int to char*
string e_str = buffer; // convert char* to string
printSS += e_str;
}