java - JAVA、for ループを使用した四半期ごとの関心

Question

import java.io.*;
import java.util.*;

public class DonaldsonDuaneMidtermActivity3A {
    public static void main (String[] args) {
        Scanner keyboard = new Scanner(System.in);
        float annualRate = 0.0F;
        float quarterlyRate = 0.0F;
        double principal = 0.0;
        double interest = 0.0;
        double finalAmount = 0.0;
        byte quarter = 0;
        int year = 0;
        annualRate = 0.05F;                                                             
        System.out.print("Enter the year: ");
        year = Integer.parseInt(keyboard.nextLine());                                   
        System.out.print("Enter the initial principal: ");
        principal = Double.parseDouble(keyboard.nextLine());                            
        System.out.printf("%s%.2f%n", "Principal = ", principal);                       
        System.out.printf("%s%.2f%c%n", "Interest Rate = ", annualRate * 100, '%');
        System.out.printf("%6s%8s%16s%30s%n", "Year", "Quarter", "Interest Earned", >"Amount at end of quarter");
        quarterlyRate = annualRate / 4;                                                 
        quarter = 1;
        interest = principal * quarterlyRate;                                           
        finalAmount = principal + interest;
        System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, finalAmount);
        principal = finalAmount;
        quarter = 2;                                                                    
        interest = principal * quarterlyRate;                                           
        finalAmount = principal + interest;
        System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, finalAmount);

        principal = finalAmount;
        quarter = 3;                                                                    
        interest = principal * quarterlyRate;                                           
        finalAmount = principal + interest;                                             
        System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, finalAmount);

        principal = finalAmount;                                                        
        quarter = 4;                                                                    
        interest = principal * quarterlyRate;                                           
        finalAmount = principal + interest;                                             
        System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, finalAmount);

        System.exit(0);`enter code here`                                                                
    }
}

最初の投稿、親切にしてください。同様のプログラムを検索しましたが、このようなプログラムは見つかりませんでした。for ループには、4 つの異なる四半期だけでなく、それらを反復処理する必要があると仮定します。また、for ループのないプログラムとまったく同じものを画面に出力する必要があります。私はそれでいくつか遊んだことがありますが、必要に応じてすべてを印刷することはできません。老人が何か新しいことに挑戦するのを手伝ってくれてありがとう。私は JCreator も使用しているので、ソフトウェアの下部にある出力ウィンドウにすべてが表示されます。

quarterlyRate = annualRate / 4;

    for (quarter = 1; quarter <= 4; quarter = quarter + 1) {

    interest = principal * quarterlyRate;

    finalAmount = principal + interest;                                             // comment out if uncomment next two lines
    System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, finalAmount);// comment out if uncomment next two lines
    //principal += interest;                                                          // add principal to interest and assign back to principal 

    //System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, principal);  // change finalAmount to principal but it keeps the same output

    principal = finalAmount;
    }                                                                               // end of for loop

    System.exit(0);