// MAINTENANCE12 // This program creates a screen with two textboxes and a button. // When the user clicks the button, a label displays the result // which is the sum of the numbers in the two textboxes. // Modify the program to allow the user to click any // of three buttons. On displays the sum of the two numbers. // The others display the difference and product respectively. start    Declarations       Screen screen1       Button calcButton       Textbox usersEntry1       Textbox usersEntry2       Label result    screen1.setSize(200, 200)    calcButton.setText("Click to sum the numbers you have entered")    calcButton.registerListener(sumNumbers())    productButton.setText(“Click to multiply the numbers you have entered”) productButton.registerListener(multiplyNumbers())    screen1.add(usersEntry1)    screen1.add(usersEntry2)    screen1.add(calcButton)    screen1.add(differenceButton)    screen1.add(productButton) stop   sumNumbers()    Declarations       Label result       num sum       string answer    sum = usersEntry1.getText() + usersEntry2.getText()    answer = "The sum of the numbers is ", sum    result.setText(answer)    screen1.add(result) return

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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// MAINTENANCE12
// This program creates a screen with two textboxes and a button.

// When the user clicks the button, a label displays the result

// which is the sum of the numbers in the two textboxes.

// Modify the program to allow the user to click any

// of three buttons. On displays the sum of the two numbers.

// The others display the difference and product respectively.

start

   Declarations

      Screen screen1

      Button calcButton

      Textbox usersEntry1

      Textbox usersEntry2

      Label result

   screen1.setSize(200, 200)

   calcButton.setText("Click to sum the numbers you have entered")

   calcButton.registerListener(sumNumbers())

   productButton.setText(“Click to multiply the numbers you have entered”)

productButton.registerListener(multiplyNumbers())

   screen1.add(usersEntry1)

   screen1.add(usersEntry2)

   screen1.add(calcButton)

   screen1.add(differenceButton)

   screen1.add(productButton)

stop

 

sumNumbers()

   Declarations

      Label result

      num sum

      string answer

   sum = usersEntry1.getText() + usersEntry2.getText()

   answer = "The sum of the numbers is ", sum

   result.setText(answer)

   screen1.add(result)

return

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