C++连接字符串有关问题

C++连接字符串问题！
c++ code
int i = 0;
string t1 = "txt";
string t2 = "";
t2 = t1+i;
这样为何不行。如何把 i和t1连接成一个新的字符串？

[解决办法]

C/C++ code

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;
[解决办法]
    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;


[解决办法]
int i = 0;            
string t1 = "txt";
string t2 = "";
char cval[3];
itoa(i,cval,10);
t2 = t1+cval;
[解决办法]
use stringstream  
C/C++ code
stringstream ss;int nNum = 0;string strName = "my num is ";ss << strName << nNum;cout << ss.str() << endl;