C++连接字符串有关问题

int i = 0;                //0表示的是空字符，你可以用i = 3试试看
string t1 = "txt";
string t2 = "";
t2 = t1+i;

------解决方案--------------------
    可以先将int变为string，然后。。。。
   如：
int main()
{
   int n = 65535;
   char t[256];
   string s;

   sprintf(t, "%d", n);
   s = t;
   cout << s << endl;


------解决方案--------------------
int i = 0;            
string t1 = "txt";
string t2 = "";
char cval[3];
itoa(i,cval,10);
t2 = t1+cval;

------解决方案--------------------
use stringstream  

C/C++ code

stringstream ss;
int nNum = 0;
string strName = "my num is ";
ss << strName << nNum;
cout << ss.str() << endl;