Thread: Java Method Help

I'm trying to create a method for the display interest and I'm struggling with how to come up with how to get it to work. Any help would be great!

 import java.util.Scanner;
public class InterestCalculator4 {
	public static void main(String[] args )
	{
		Scanner input = new Scanner(System.in);
 
		String strAnsYesNo;
		char ansYesNo = 0;
 
		do{
 
			//Prompt user to enter loan amount
			System.out.print("Enter Loan Amount: ");
		    double principle = input.nextInt();
 
		    //Prompt user to enter interest rate
			System.out.print("Enter Yearly Interest Rate (1 to 100 percent): ");
		    double interest = input.nextDouble(); 
 
		  //Prompt user to enter term 
		    System.out.print("Enter the Term (in months): ");
		    double term = input.nextInt(); 
 
		   if (principle > 0) 
			   {
			    	if (interest >= 0 && interest <= 100) 
			    	{
			    		if(term > 0)
			    		{
			    			int type = 0;	 
 
			    			    //Prompt user to enter calculation type
			    			   do{System.out.print("Enter Interest Calculation Type (1 – Simple, 2 – Monthly Compounded, 3 – Daily Compounded):");
			    			    type = input.nextInt();
 
 
			    			   switch(type) 
			    			    {
			    			    case 1:
			    			    break;
 
			    			    case 2:
			    			    break;
 
			    			    case 3:
			    			    break;
 
			    			    default: System.out.println("Calculation Type Error: You must select 1, 2 or 3. You entered " +type);
			    			    break;
 
			    		        }
			    			   }while(type<1||type>3);
			    			}
			    	    else
			    	    {
			    	    	System.out.println("Data Error: Term must be greater than zero. You entered " +term);
 
			    	    }
			        }
			    	else 
			    	{
			    		System.out.println("Data Error: Interest rate must be greater than or equal to zero and less than or equal to 100. You entered " +interest);
			    	}
			   }
			   else
			   {	
			    		System.out.println("Data Error: Loan amount must be greater than zero. You entered " +principle);
			   }
 
		// Clear out buffer
		   input.nextLine();
 
		do{
			System.out.println("Calculate another loan interest (Yes/No)?");
			strAnsYesNo = input.nextLine();
 
			// Make sure user entered in data
			if (strAnsYesNo.length() > 0)
			ansYesNo = strAnsYesNo.charAt(0);
 
			if(ansYesNo!='y'&& ansYesNo!='Y'&& ansYesNo!='n'&& ansYesNo!='n')
			{
				System.out.println("Please enter 'Yes' or 'No'?");
			}
 
		}while(ansYesNo!='y'&& ansYesNo!='Y'&& ansYesNo!='n'&& ansYesNo!='n');
 
 
		}while (ansYesNo =='y' || ansYesNo =='Y');
		System.out.println("Thank you for using Interest Calculator!");
	}
 
 
	/** Round **/
	  public static double round(double numb1, double numb2) {
	    double round = ((double) Math.round(numb1*(Math.pow(10, numb2)))/(Math.pow(10, numb2)));;
		return round;
	  }
 
	/** Calculate Simple **/
	  public static double calculateSimpleInterest(double numb1, double numb2, double numb3) {
	    double calculateSimpleInterest = ((numb1)*(numb2/100.0)*(numb3/12.0));
		return calculateSimpleInterest;
	  }
 
	  /** Calculate Compounded Daily **/
	  public static double calculateCompoundInterest(double numb1, double numb2, double numb3, double numb4 ) {
	     double calculateCompoundInterest = (numb1*Math.pow((1.0+((numb2/100.0)/numb4)),(numb4*(numb3/12.0))))-numb1;
		return calculateCompoundInterest;
	  }
 
	  /** display interest **/
	  public static char displayInterest(double numb1, double numb2, double numb3, char word1, double numb4, double numb5 ) {
		  numb5 = numb1 + numb4; 
 
		  System.out.println("Principal Amount    Interest Rate    Term    Calculation Type    Calculated Interest    Total Repayment");
		  System.out.println("----------------    -------------    ----    ----------------    -------------------    ---------------");
		  System.out.println("+numb1",              "+numb2",       "numb3", "+word1",           "+numb4",                "+numb5");
	  }
	}

Sorry!
Purpose: To display the result of the calculated interest to the user. Parameters: You will need to determine the number of parameters and their appropriate data type of each parameter to display the output to the user.

It is suppose to print out
Principal Amount Interest Rate Term Calculation Type Calculated Interest Total Repayment Amount
---------------- ------------- ---- ---------------- ------------------- ----------------------
$1375.0 1.175 7 Compound Monthly $9.45221 $1384.45

I was thinking with the parameters
numb1= principle
numb2= interest
numb3=term
word1= the type of interest calculated
numb4= the interest
numb5= the total repayment(interest+principle)

--- Update ---

When the user enters in the principle, interest, and term. Then the user enters in which interest type they'd like to calc so 1-simple 2-monthly compounded 3-daily compounded and when they enter 1,2, or 3 it prints out numbers will vary though to which the user enters

Principal Amount Interest Rate Term Calculation Type Calculated Interest Total Repayment Amount
---------------- ------------- ---- ---------------- ------------------- ----------------------
$1375.0 1.175 7 Compound Monthly $9.45221 $1384.45

It won't compile it gives me an error at

System.out.println("+numb1",              "+numb2",       "numb3", "+word1",           "+numb4",                "+numb5");

saying the method println(string) in the type printstream is not applicable for the arguments ( string, string, string, string, string)

I changed it to

 /** display interest **/
	  public static void displayInterest(double numb1, double numb2, double numb3, char word1, double numb4, double numb5 ) {
		  numb5 = numb1 + numb4; 
 
		System.out.println("Principal Amount    Interest Rate    Term    Calculation Type    Calculated Interest    Total Repayment");
		  System.out.println("----------------    -------------    ----    ----------------    -------------------    ---------------");
		 System.out.println("+numb1              +numb2       +numb3 +word1           +numb4                +numb5");
	  }

Then when I put it to where I want to print out when they select 1,2, or 3 it has an error

 switch(type) 
			    			    {
			    			    case 1: displayInterest(principle,interest,term,"Simple",principle);
			    			    break;
 
			    			    case 2: displayInterest(principle,interest,term,"Monthly Compounded",principle);
			    			    break;
 
			    			    case 3:displayInterest(principle,interest,term,"Daily Compounded",principle);
			    			    break;
 
			    			    default: System.out.println("Calculation Type Error: You must select 1, 2 or 3. You entered " +type);
			    			    break;
 
			    		        }

It has an error saying it's arguments are not applicable

Sorry, it won't compile but the error is the method displayInterest(double,double, double, char,double) in the type InterestCalculator4 is not applicable for the arguments (double, double,double, string, double)

 Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	a cannot be resolved to a variable
	Monthly cannot be resolved to a variable
	Syntax error on token "Compounded", delete this token
	The method displayInterest(double, double, double, char, double, double) in the type InterestCalculator4 is not applicable for the arguments (double, double, double, String, double)

at InterestCalculator4.main(InterestCalculator4.java: 45)

Would I define it was a char or string? That's what I'm confused about

When I type in String it doesn't recognize it as a string variable.

I got it to work! Thanks for your help and baring with me!