fig02_21.cpp

《c＋＋大学教程》源码

// Fig. 2.21: fig02_21.cpp
// Calculating compound interest.
#include <iostream>

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

#include <iomanip>

using std::setw;
using std::setprecision;

#include <cmath>  // enables program to use function pow

// function main begins program execution
int main()
{
   double amount;              // amount on deposit
   double principal = 1000.0;  // starting principal
   double rate = .05;          // interest rate

   // output table column heads
   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 );

      // output one table row
      cout << setw( 4 ) << year 
           << setw( 21 ) << amount << endl;

   } // end for 

   return 0;   // indicate successful termination

} // end function main


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