ex03_03.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）

// ex03_03.cpp
// Testing the math library func
#include <iostream>

using std::cout;
using std::endl;
using std::ios;

#include <iomanip>

using std::setiosflags;
using std::fixed;
using std::setprecision;

#include <cmath>

int main()
{
   cout << setiosflags( ios::fixed | ios::showpoint )
        << setprecision( 1 ) 
        << "sqrt(" << 900.0 << ") = " << sqrt( 900.0 )
        << "\nsqrt(" << 9.0 << ") = " << sqrt( 9.0 )
        << "\nexp(" << 1.0 << ") = " << setprecision( 6 ) 
        << exp( 1.0 ) << "\nexp(" << setprecision( 1 ) << 2.0 
        << ") = " << setprecision( 6 ) << exp( 2.0 ) 
        << "\nlog(" << 2.718282 << ") = " << setprecision( 1 ) 
        << log( 2.718282 ) << "\nlog(" << setprecision( 6 ) 
        << 7.389056 << ") = " << setprecision( 1 ) 
        << log( 7.389056 ) << endl;
   cout << "log10(" << 1.0 << ") = " << log10( 1.0 )
        << "\nlog10(" << 10.0 << ") = " << log10( 10.0 ) 
        << "\nlog10(" << 100.0 << ") = " << log10( 100.0 ) 
        << "\nfabs(" << 13.5 << ") = " << fabs( 13.5 )
        << "\nfabs(" << 0.0 << ") = " << fabs( 0.0 )
        << "\nfabs(" << -13.5 << ") = " << fabs( -13.5 ) << endl;
   cout << "ceil(" << 9.2 << ") = " << ceil( 9.2 )
        << "\nceil(" << -9.8 << ") = " << ceil( -9.8 )
        << "\nfloor(" << 9.2 << ") = " << floor( 9.2 )
        << "\nfloor(" << -9.8 << ") = " << floor( -9.8 ) << endl;
   cout << "pow(" << 2.0 << ", " << 7.0 << ") = " 
        << pow( 2.0, 7.0 ) << "\npow(" << 9.0 << ", " 
        << 0.5 << ") = " << pow( 9.0, 0.5 ) 
        << setprecision(3) << "\nfmod("
        << 13.675 << ", " << 2.333 << ") = " 
	<< fmod( 13.675, 2.333 ) << setprecision( 1 ) 
        << "\nsin(" << 0.0 << ") = " << sin( 0.0 ) 
        << "\ncos(" << 0.0 << ") = " << cos( 0.0 )
        << "\ntan(" << 0.0 << ") = " << tan( 0.0 ) << endl;
   return 0;
}



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 * (C) Copyright 2000 by Deitel & Associates, Inc. and Prentice Hall.     *
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