JAVA，季度兴趣与循环

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`                 
    } 
} 

第一篇文章，请亲切，我已经搜索过类似的程序，但没有看到任何这样的一个。我会假设我需要在for循环中加入更多的东西，而不仅仅是我的4个不同的宿舍来遍历它们。我也需要输出一些东西到屏幕上，这与没有for循环的程序完全一样。我已经玩了一些，不能根据需要把所有东西都打印出来。感谢帮助一位老人尝试新事物。我也使用JCreator，因此我可以在软件较低区域的输出窗口中获得所有内容。

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); 

Answer 1

如果我按照你的问题，那么你应该使用一个for循环应用感兴趣的principal，然后打印您的消息。这应该是这个样子

for (int quarter = 1; quarter <= 4; quarter++) { 
    interest = principal * quarterlyRate;           
    principal += interest; 
    System.out.printf("%6s%8d%16.2f%30.2f%n", year, quarter, interest, principal); 
}