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Chapter 1: Problem 29

Are programs expressed as English statements. What would each display on the screen if they were actual programs? The variable sum starts with the value 0. Add 10 to sum. Add 15 to sum. Add 20 to sum. Display the value of sum on the screen.

Short Answer

Expert verified
Answer: The final output of the given algorithm is 45.

Step by step solution

01

Initialize the variable "sum" at 0

Initialize the variable "sum" by assigning the value 0, like this: sum = 0.
02

Add 10 to sum

To add 10 to "sum", perform the operation "sum = sum + 10". This means, take the current value of "sum" (which is 0), add 10 to it, and store the result back in the variable "sum". So, sum = 0 + 10 = 10.
03

Add 15 to sum

To add 15 to "sum", perform the operation "sum = sum + 15". In this case, the current value of "sum" is 10, so sum = 10 + 15 = 25.
04

Add 20 to sum

To add 20 to "sum", perform the operation "sum = sum + 20". In this case, the current value of "sum" is 25, so sum = 25 + 20 = 45.
05

Display the value of sum on the screen

Finally, we have computed the value of "sum" as 45. To display this value on the screen, we would use a print statement, like this: print(sum). The output of the program would display "45" on the screen, because that is the value of sum after executing all the addition steps.

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Most popular questions from this chapter

A program is a set of ______.

Sales Tax Write high-level and detailed psuedocode for a program that calculates the total of a retail sale. The program should ask the user for • The retail price of the item being purchased • The sales tax rate Once these items have been entered, the program should calculate and display • The sales tax for the purchase • The total of the sale

Words or names defined by the programmer are called _________.

Before a programmer can design a program he or she must have some basic knowledge about the domain, or area, the program will deal with and must understand exactly what it is that the client wants the program to do. Otherwise the final program may not work correctly or may not meet the client’s needs. Suppose one of your friends, who paints the insides of houses, has asked you to develop a program that determines and displays how much paint is needed to paint a room if the length and width of the room is input. What information are you lacking that you need to write this program? Write at least three questions that you would need to ask your friend before starting the project.

The rules that must be followed when constructing a program are called __________.
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