deyou
58 lines
1.5 KiB
Java
58 lines
1.5 KiB
Java
/**
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* This program shows how to store tabular data in a 2D array.
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* @version 1.40 2004-02-10
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* @author Cay Horstmann
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*/
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public class CompoundInterest
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{
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public static void main(String[] args)
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{
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final double STARTRATE = 10;
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final int NRATES = 6;
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final int NYEARS = 10;
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// set interest rates to 10 . . . 15%
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double[] interestRate = new double[NRATES];
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for (int j = 0; j < interestRate.length; j++)
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interestRate[j] = (STARTRATE + j) / 100.0;
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double[][] balances = new double[NYEARS][NRATES];
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// set initial balances to 10000
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for (int j = 0; j < balances[0].length; j++)
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balances[0][j] = 10000;
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// compute interest for future years
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for (int i = 1; i < balances.length; i++)
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{
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for (int j = 0; j < balances[i].length; j++)
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{
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// get last year's balances from previous row
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double oldBalance = balances[i - 1][j];
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// compute interest
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double interest = oldBalance * interestRate[j];
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// compute this year's balances
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balances[i][j] = oldBalance + interest;
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}
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}
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// print one row of interest rates
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for (int j = 0; j < interestRate.length; j++)
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System.out.printf("%9.0f%%", 100 * interestRate[j]);
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System.out.println();
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// print balance table
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for (double[] row : balances)
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{
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// print table row
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for (double b : row)
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System.out.printf("%10.2f", b);
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System.out.println();
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}
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}
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}
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