Question

Instructions

Name the Java Classes as specified below for each problem. Each problem requires only a single Class. The running of each of the programs should look very similar to the examples given below. (Formatting, etc. The numbers could differ each time the programs are run.)

Make sure you use a nice “class/file comment header block” at the beginning, as illustrated below. This should go at the very top of your .java file, before any of the code.

////////////////////////////////////////////////////////////

// Program: <put program name here>

// Author: <put your name here>

// Date: <put the date you wrote the program here>

// Description: <put a brief description of the program here>

// For: <put the course acronym+number here>

//////////////////////////////////////////////////////////// For example:

////////////////////////////////////////////////////////////

// Program: Interest

// Author: Sam Smith

// Date: 2019 Oct 27

// Description: Calculates and display simple interest

//  when the principal and interest rate are entered.

// For: CIS210

////////////////////////////////////////////////////////////

Java HW Descriptions

1. (25 pts) Interest. Calculate interest from principal and interest rate. Interest is calculated as the principal multiplied by the interest rate. (We will assume for this assignment that we are doing simple, not compound, interest.) When prompted, the user will enter the principal amount and the interest rate, and the program will read these in and then calculate the interest from these values and display a nicely‐formatted set of results.
2. (25 pts) UtilityBill. Ask for 12 (monthly) utility bill amounts, keeping a running sum (total) as you go. Amounts may include values in the range of 0.0 through 999.99. (But you don’t have to enforce this range.) After all data is entered, calculate and display count, sum, and average.

Anyone know how to code this?

Answer 1

Interest.java

import java.util.Scanner;

public class Interest {
  
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter the principal amount: $");
double principal = Double.parseDouble(sc.nextLine().trim());
System.out.print("Enter the interest rate: ");
double interestRate = Double.parseDouble(sc.nextLine().trim());
  
double interest = (principal * interestRate);
  
System.out.printf("\nPrincipal: $%,5.2f\n", principal);
System.out.printf("Interest Rate: %,5.2f\n", interestRate);
System.out.printf("Interest: $%,5.2f\n", interest);
}
}

OUTPUT :

***********************************************************************************************************************************

Utility.java

import java.util.Scanner;

public class UtilityBill {
  
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int count = 0;
double sum = 0.0, avg;
  
while(count <= 12)
{
if(count == 12)
{
avg = (sum / (double)count);
System.out.println("\nCount = " + count + "\n"
+ "Sum = " + sum + "\n"
+ "Average = " + avg);
System.exit(0);
}
else
{
count++;
System.out.print("Enter the bill amount for month " + count + ": $");
double bill = Double.parseDouble(sc.nextLine().trim());
sum += bill;
}
}
}
}

OUTPUT :