Exploring stringstreams, C++ (clang)

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// Exploring stringstream
//
#include <iostream>
#include <sstream>

using namespace std;

int main()
{
    auto iData = 0;
    auto dData = 0.0;
    string sData("\0");
    
    cout << "Please enter a number\n";
    getline(cin, sData);
    
    stringstream(sData) >> iData;
    stringstream(sData) >> dData;
    
    cout << "Data as string = " << sData << "\n\n";
    cout << "Data as integer = " << iData << "\n";
    //
    // cout << "sData * 2 = " << (sData * 2) << "\n"; Generates an Error
    //
    cout << "iData * 2 = " << (iData * 2) << "\n\n";
    
    cout << "Data as double = " << dData << "\n";
    cout << "dData * 3.30 = " << (dData * 3.30) << "\n\n";
    
    
    //string siData{"11235813"};
    string sdData{"123456789.5321"};
    
    stringstream(sdData) >> iData;
    stringstream(sdData) >> dData;
    
    int val = iData * 2;
    cout << "string:\t" << sdData << "\tinteger:\t" << iData << "\n";
    cout << iData << "*2 = " << val << "\n\n";
   
    double dval = dData * 2.0;
    cout.precision(12) << cout.setf(ios::showpoint);
    cout << "string:\t" << sdData << "\tdouble:\t" << dData << "\n";
    cout << dData << "*2.0 = " << dval << "\n\n";
    
}

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Compilation time: 1.02 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 1.35 sec