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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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