fig11_17.cpp

这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to program》第3版）

// Fig. 11.17: fig11_17.cpp 
// Controlling precision of floating-point values
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

#include <iomanip>

using std::ios;
using std::setiosflags;
using std::setprecision;

#include <cmath>

int main()
{
   double root2 = sqrt( 2.0 );
   int places;

   cout << setiosflags( ios::fixed)
        << "Square root of 2 with precisions 0-9.\n"
        << "Precision set by the "
        << "precision member function:" << endl;

   for ( places = 0; places <= 9; places++ ) {
      cout.precision( places );
      cout << root2 << '\n';
   }

   cout << "\nPrecision set by the "
        << "setprecision manipulator:\n";

   for ( places = 0; places <= 9; places++ )
      cout << setprecision( places ) << root2 << '\n';

   return 0;
}




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