int main()
{
stringstream sstr;
//--------int转string-----------
int a=100;
string str;
sstr<<a;
sstr>>str;
cout<<str<<endl;
//如果你想通过使用同一stringstream对象实现多种类型的转换，请注意在每一次转换之后都必须调用clear()成员函数。
sstr.clear();
//--------string转char[]--------
string name = "colinguan";
char cname[200];
sstr<<name;
sstr>>cname;
cout<<cname<<endl;
sstr.clear();
//--------string转double/int--------
double dVal;
int iVal;
stringstream ss;
// string -> double
str = "123.456789";
ss << str;
ss >> dVal;
cout << "dVal: " << dVal << endl;
ss.clear();
// string -> int
str = "654321";
ss << str;
ss >> iVal;
cout << "iVal: " << iVal << endl;
ss.clear();
}