?? sum2.cpp
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/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>#include <cstdlib>namespace MyLib { double readAndProcessSum (std::istream&);}int main(){ using namespace std; double sum; try { sum = MyLib::readAndProcessSum(cin); } catch (const ios::failure& error) { cerr << "I/O exception: " << error.what() << endl; return EXIT_FAILURE; } catch (const exception& error) { cerr << "standard exception: " << error.what() << endl; return EXIT_FAILURE; } catch (...) { cerr << "unknown exception" << endl; return EXIT_FAILURE; } // print sum cout << "sum: " << sum << endl;}#include <istream>namespace MyLib { double readAndProcessSum (std::istream& strm) { double value, sum; /* while stream is OK * - read value and add it to sum */ sum = 0; while (strm >> value) { sum += value; } if (!strm.eof()) { throw std::ios::failure ("input error in readAndProcessSum()"); } // return sum return sum; }}
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