fig05_06.cpp

c++大学教程第5版的配套书源代码

// Fig. 5.6: fig05_06.cpp
// Compound interest calculations with for.
#include <iostream>
using std::cout;
using std::endl;
using std::fixed;

#include <iomanip>
using std::setw; // enables program to set a field width
using std::setprecision;

#include <cmath> // standard C++ math library
using std::pow; // enables program to use function pow

int main()
{
   double amount; // amount on deposit at end of each year
   double principal = 1000.0; // initial amount before interest
   double rate = .05; // interest rate

   // display headers
   cout << "Year" << setw( 21 ) << "Amount on deposit" << endl;

   // set floating-point number format
   cout << fixed << setprecision( 2 );

   // calculate amount on deposit for each of ten years
   for ( int year = 1; year <= 10; year++ ) 
   {
      // calculate new amount for specified year
      amount = principal * pow( 1.0 + rate, year );

      // display the year and the amount
      cout << setw( 4 ) << year << setw( 21 ) << amount << endl;
   } // end for 

   return 0; // indicate successful termination
} // end main


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