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I need assistance with a rectangular array?
I don't understand how to add code that stores the formatted values as strings in the next row of the array and use the toStrings method of the integer class to store the years value? so far i've been able to create the initial program just need help with storeing the formatted values as strings in the next row of the array and use the toStrings method of the integer class to store the years value?
this is the type of table i want to accomplish:
monthly investment. Yearly interset rate. Years. future value.
$100.00 ---------------------- 8.0----------10---- $18,2000
$200.00 ---------------------- 7.0 --------- 7 -- ------ $6.2
heres my code so far.
PHP Code:import java.util.*;
import java.text.*;
public class FutureValueApp
{
public static void main(String[] args)
{
String[][] FutureValueArray = new String [10][4];
int counter = 0;
// display a welcome message
System.out.println("Welcome to the Future Value Calculator");
System.out.println();
// perform 1 or more calculations
Scanner sc = new Scanner(System.in);
String choice = "y";
while (choice.equalsIgnoreCase("y"))
{
// get the input from the user
System.out.println("DATA ENTRY");
double monthlyInvestment = getDoubleWithinRange(sc,
"Enter monthly investment: ", 0, 1000);
double interestRate = getDoubleWithinRange(sc,
"Enter yearly interest rate: ", 0, 30);
int years = getIntWithinRange(sc,
"Enter number of years: ", 0, 100);
// calculate the future value
double monthlyInterestRate = interestRate/12/100;
int months = years * 12;
double futureValue = calculateFutureValue(
monthlyInvestment, monthlyInterestRate, months);
// get the currency and percent formatters
NumberFormat currency = NumberFormat.getCurrencyInstance();
NumberFormat percent = NumberFormat.getPercentInstance();
percent.setMinimumFractionDigits(1);
// format the result as a single string
String results =
"Monthly investment:\t"
+ currency.format(monthlyInvestment) + "\n"
+ "Yearly interest rate:\t"
+ percent.format(interestRate/100) + "\n"
+ "Number of years:\t"
+ years + "\n"
+ "Future value:\t\t"
+ currency.format(futureValue) + "\n";
// print the results
System.out.println();
System.out.println("FORMATTED RESULTS");
System.out.println(results);
FutureValueArray[counter][0] = Double.toString(monthlyInvestment);
FutureValueArray[counter][1] = Double.toString(interestRate);
FutureValueArray[counter][2] = Integer.toString(years);
FutureValueArray[counter][3] = Double.toString(futureValue);
System.out.print("Inv/Mo.\tRate\tYears\tFuture Value\n");
for(int i = 0; i < FutureValueArray.length; i++)
{
for (int j = 0; j < FutureValueArray[i].length; j++)
System.out.println(FutureValueArray[i][j] + " \t");
System.out.println("\n");
}
// see if the user wants to continue
System.out.print("Continue? (y/n): ");
choice = sc.next();
counter++;
System.out.println();
}
}
public static double getDouble(Scanner sc, String prompt)
{
boolean isValid = false;
double d = 0;
while (isValid == false)
{
System.out.print(prompt);
if (sc.hasNextDouble())
{
d = sc.nextDouble();
isValid = true;
}
else
{
System.out.println("Error! Invalid decimal value. Try again.");
}
sc.nextLine(); // discard any other data entered on the line
}
return d;
}
public static double getDoubleWithinRange(Scanner sc, String prompt,
double min, double max)
{
double d = 0;
boolean isValid = false;
while (isValid == false)
{
d = getDouble(sc, prompt);
if (d <= min)
System.out.println(
"Error! Number must be greater than " + min + ".");
else if (d >= max)
System.out.println(
"Error! Number must be less than " + max + ".");
else
isValid = true;
}
return d;
}
public static int getInt(Scanner sc, String prompt)
{
boolean isValidInt = false;
int i = 0;
while (isValidInt == false)
{
System.out.print(prompt);
if (sc.hasNextInt())
{
i = sc.nextInt();
isValidInt = true;
}
else
{
System.out.println("Error! Invalid integer value. Try again.");
}
sc.nextLine(); // discard any other data entered on the line
}
return i;
}
public static int getIntWithinRange(Scanner sc, String prompt,
int min, int max)
{
int i = 0;
boolean isValid = false;
while (isValid == false)
{
i = getInt(sc, prompt);
if (i <= min)
System.out.println(
"Error! Number must be greater than " + min + ".");
else if (i >= max)
System.out.println(
"Error! Number must be less than " + max + ".");
else
isValid = true;
}
return i;
}
public static double calculateFutureValue(double monthlyInvestment,
double monthlyInterestRate, int months)
{
double futureValue = 0;
for (int i = 1; i <= months; i++)
{
futureValue =
(futureValue + monthlyInvestment) *
(1 + monthlyInterestRate);
}
return futureValue;
}
}
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