#include <iostream>
    #include <sstream>
    using namespace std;
    int main()
    {
        stringstream strstream(ios :: in | ios :: out);
        std :: string data("The double value is : 12.25 .");
        strstream.str(data);
        strstream.seekg(-5, ios :: end);
        double value;
        strstream >> value;
        value = value*value;
        strstream.seekp(-5,ios::end);
        strstream << value;
        std :: string new_value = strstream.str();
        cout << new_value;
        return 0;
    }