String to int, double? (C/C ++)

// Changstring. cpp: defines the entry point of the console application.
//

# Include "stdafx. H"
# Include <iostream>
# Include <sstream>
# Include <string>
# Include <cstdlib>
Using namespace STD;

Template <class T>
Void convertfromstring (T &, const STD: string &);

Template <class T>
STD: String converttostring (t );

Int _ tmain (INT argc, _ tchar * argv [])
{
STD: String S ("123 ");

// Convert STD: string to int
Int I = 0;
Convertfromstring (I, S );
STD: cout <I <STD: Endl;
Float F = 12.5;
String STR = converttostring (f );
Cout <STR <Endl;
Cin> I;
}

Template <class T>
Void convertfromstring (T & Value, const STD: string & S)
{
STD: stringstream SS (s );
SS> value;
}

Template <class T>
STD: String converttostring (T value)
{
STD: stringstream SS;
SS <value;
Return ss. STR ();
}