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

  1. #1
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    Default 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.
    Last edited by copeg; January 30th, 2011 at 08:51 PM.


  2. #2
    Member DanBrown's Avatar
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    Default Re: My code is having error, may be a lost of precision

    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
    Thanks and Regards
    Dan Brown

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