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solmaris [256]
3 years ago
12

Write a calculator program that keeps track of a subtotal like real calculators do. Start by asking the user for an initial numb

er. Inside a loop, asks the user for a mathematical operation and a second number. Do the operation with the first number on the second number. Keep track of the result as a 'subtotal' to be used as the first number when going back to the top of the loop. When the user quits, print out the final result and quit the program. See output for an example for the behavior of the program. The operations should be at least
Computers and Technology
1 answer:
Taya2010 [7]3 years ago
8 0

Answer:

num1 = float(input("Enter the first number: "))

while True:

   print("Add, Subtract, Multiply, Divide, or Quit ?")

   choice = input("Your choice is: ")

   if choice == "Quit":

       break

   num2 = float(input("Enter the second number: "))

   if choice == "Add":

       num1 += + num2

       print("The subtotal is: " + str(num1))

   elif choice == "Subtract":

       num1 -= num2

       print("The subtotal is: " + str(num1))

   elif choice == "Multiply":

       num1 *= num2

       print("The subtotal is: " + str(num1))

   elif choice == "Divide":

       num1 /= num2

       print("The subtotal is: " + str(num1))

print("The final result is: " + str(num1))

Explanation:

Ask the user for the first number

Create a while loop that iterates until specified condition occurs inside the loop

Ask the user for the operation or quitting

If the user chooses quitting, stop the loop. Otherwise, get the second number, perform the operation and print the subtotal

When the loop is done, the user enters Quit, print the final value result

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Explanation:

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Answer:

Explanation:

The code provided worked for the most part, it had some gramatical errors in when printing out the information as well as repeated values. I fixed and reorganized the printed information so that it is well formatted. The only thing that was missing from the code was the input validation to make sure that no negative values were passed. I added this within the getMonths() method so that it repeats the question until the user inputs a valid value. The program was tested and the output can be seen in the attached image below.

import java.io.*;

import java.util.*;

class Rainfall

{

   Scanner in = new Scanner(System.in);

   private int month = 12;

   private double total = 0;

   private double average;

   private double standard_deviation;

   private double largest;

   private double smallest;

   private double months[];

   public Rainfall()

   {

       months = new double[12];

   }

   public void setMonths()

   {

       for(int n=1; n <= month; n++)

       {

           int answer = 0;

           while (true) {

               System.out.println("Enter the rainfall (in inches) for month #" + n + ":" );

               answer = in.nextInt();

               if (answer > 0) {

                   months[n-1] = answer;

                   break;

               }

           }

       }

   }

   public void getTotal()

   {

       total = 0;

       for(int i = 0; i < 12; i++)

       {

           total = total + months[i];

       }

       System.out.println("The total rainfall for the year is " + total);

   }

   public void getAverage()

   {

       average = total/12;

       System.out.println("The average monthly rainfall is " + average);

   }

   public void getLargest()

   {

       double largest = 0;

       int largeind = 0;

       for(int i = 0; i < 12; i++)

       {

           if (months[i] > largest)

           {

               largest = months[i];

               largeind = i;

           }

       }

       System.out.println("The largest amount of rainfall was " + largest +

               " inches in month " + (largeind + 1));

   }

   public void getSmallest()

   {

       double smallest = Double.MAX_VALUE;

       int smallind = 0;

       for(int n = 0; n < month; n++)

       {

           if (months[n] < smallest)

           {

               smallest = months[n];

               smallind = n;

           }

       }

       System.out.println("The smallest amount of rainfall was " + smallest +

               " inches in month " + (smallind + 1));

   }

   public static void main(String[] args)

   {

       Rainfall r = new Rainfall();

       r.setMonths();

       r.getTotal();

       r.getSmallest();

       r.getLargest();

       r.getAverage();

   }

}

8 0
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