Thread: My code is having error, may be a lost of precision

import java.util.*;
	import java.text.*;
 
	public class Interest 
 
	{
    static Scanner input = new Scanner(System.in).useDelimiter("\r\n");
	static DecimalFormat fmt = new DecimalFormat("0.00");
 
 
 
 
    public static void main(String[] args) throws Exception
    {
    	int choice=0;
    	int i=0;
    	double [] iPrinciple = new double[4];
	    double [] iEarned = new double [4];
	    double [] iRate = new double [4];
	    int [] iDays = new int [4];
 
 
    	while (choice !='4')
    	{
    		System.out.println("      Interest Calculator     ");
    		System.out.println("================================");
    		System.out.println("1)Calculate the interest payable");
    		System.out.println("2)Calculate the principle required to earn $x of interest");
    		System.out.println("3)Calculate the time required to earn $x of interest");
    		System.out.println("4)Exit the program");
    		System.out.println("");
    		System.out.print("Please select your choice (1-4): ");
    		choice = input.nextInt();
    		switch(choice)		
    	{
    		case 1 : 	for (i=0; i<10; i++)
    				  	{
    				  		System.out.print("Enter principle amount $: ");
    				  		iPrinciple[i] = input.nextDouble();
    				  		System.out.print("Enter interest rate in %: ");
    				  		iRate[i] = input.nextDouble();
    				  		System.out.print("Enter period rate(time) in days: ");
    				  		iDays[i] = input.nextInt();
    				  		iEarned[i] = (iPrinciple[i]*(iRate[i]/100)*(iDays[i]/360));
    				  		System.out.println(" Interest earned for principle of " + iPrinciple[i] + " at interest rate of " + iRate[i] + " is " + fmt.format(iEarned[i]));
							break;
    					}
 
    		case 2: for (i=0; i<10; i++)
    				  {
    				  	System.out.print("Enter the interest amount to be earned in $ : ");
    				  	iEarned[i] = input.nextDouble();
    				  	System.out.print("Enter the  interest rate in % : ");
    				  	iRate[i] = input.nextDouble();
    				  	System.out.print("Enter the period<time> in days : ");
    				  	iDays[i] = input.nextInt();
    				  	iPrinciple[i] = (iEarned[i]/((iRate[i]/100)*(iDays[i]/360)));
    				  	System.out.println(" To earn an interest of " + iEarned[i] + " over a period of " + iDays[i] + " you need a principle of " + fmt.format(iPrinciple[i]));
    				  }
    				  break;
    	  	case 3: for (i=0; i<10; i++)
    				  {
    				  	System.out.println("Enter the interest amount to be earned in $ : ");
    				  	iEarned[i] = input.nextDouble();
    				  	System.out.println("Enter the interest rate in % : ");
    				  	iRate[i] = input.nextDouble();
    				  	System.out.println("Enter the principle amount in $: ");
    				  	iDays[i] = input.nextInt();
    				  	iPrinciple[i] = iEarned[i]/(iRate[i]*iDays[i]);
    				  	System.out.println(" To earn an interest of " + iEarned[i] + " over a period of " + iDays[i] + " you need a principle of " + fmt.format(iPrinciple[i]));
 
    				 }
    				 break;
 
    		case 4: for (int j=0; j<i ; j++)
    				{
    					System.out.println("Principle        Rate      Days        Interest                  Total");
    					System.out.println("  ($)             (%)                    ($)                     ($)");
    					System.out.println("---------        ----      ----        --------                  -----");
    					System.out.println(iPrinciple[i] +  iRate[i] + iDays[i] +  iEarned[i]  +    (iPrinciple[i] + iEarned[i]));
 
    				}
    				break;
    		default: System.out.println("This is an invalid choice, please select 1-4 only ");
    	}
 
    	System.out.println("");	
 
}    
}
}

Please i need help in this . This doesnt come out as expected from the code i input in. And it doesnt calculate.

case 1 : for (i=0; i<10; i++)
{
System.out.print("Enter principle amount $: ");
iPrinciple[i] = input.nextDouble();
System.out.print("Enter interest rate in %: ");
iRate[i] = input.nextDouble();
System.out.print("Enter period rate(time) in days: ");
iDays[i] = input.nextInt();
iEarned[i] = (iPrinciple[i]*(iRate[i]/100)*(iDays[i]/360));
System.out.println(" Interest earned for principle of " + iPrinciple[i] + " at interest rate of " + iRate[i] + " is " + fmt.format(iEarned[i]));
break;
}

why are you using loop in every case