hypotenusecalculator.cpp

C++大学简明教程,解压就行没有密码。希望对大家有用

// Tutorial 10: HypotenuseCalculator.cpp
// This program finds and displays hypotenuse of a triangle
// whose sides are entered by the user.
#include <iostream> // required to perform C++ stream I/O 
#include <iomanip>  // required for parameterized stream manipulators
#include <cmath>    // require to access function sqrt

using namespace std; // for accessing C++ Standard Library members

// return the square of side
double square( double side )
{
   return side * side; // return square of argument

} // end function square
   
// function main begins program execution
int main()
{
   // define variables
   double sideA; // stores length of side A
   double sideB; // stores length of side B
   
   // prompt user for and input side lengths
   cout << "\nEnter length of side A: ";
   cin >> sideA; // get side A

   cout << "Enter length of side B: ";
   cin >> sideB; // get side B

   // display an error message if the user enters invalid input
   if ( sideA <= 0 || sideB <= 0 )
   {
      cout << "You must enter positive nonzero numbers.\n" << endl;
   } // end if
   else
   {
      // calculate the squares of sides A and B
      double squaredSideA = square( sideA );
      double squaredSideB = square( sideB );
      
      // use the Pythagorean theorem to calculate
      // the square of the hypotenuse
      double squaredHypotenuse = squaredSideA + squaredSideB;

      // use cmath function sqrt to calculate the square
      // root of the hypotenuse squared (this is the hypotenuse)
      double hypotenuse = sqrt( squaredHypotenuse );
      
      // specify output format
      cout << fixed << setprecision( 2 );

      // display hypotenuse 
      cout << "\nLength of hypotenuse is " << hypotenuse << "\n"
           << endl;

   } // end else

   return 0; // indicate that program ended successfully

} // end function main
   

/**************************************************************************
 * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 **************************************************************************/