Computer Science: An Overview: Global Edition (12th Edition)

Published by Pearson Higher Education
ISBN 10: 1292061162
ISBN 13: 978-1-29206-116-0

Chapter 12 - Theory of Computation - Chapter Review Problems - Page 570: 11

Answer

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Work Step by Step

The Bare Bones language would remain a universal language if the `while` loop were removed because Bare Bones is based on a minimalistic instruction set called Subleq (Subtract and Branch if Less than or Equal to Zero). This means Bare Bones programs can be expressed using only three instructions: clear, increment, and decrement. While loops are not essential for universality in Bare Bones because its computational power comes from the simplicity and universality of Subleq instructions, which allow for Turing completeness. Therefore, removing the `while` loop would not affect Bare Bones' ability to express any computable function. The posttest loop expressed in the form "repeat...until (name equals 0)" is commonly used in programming languages like Pascal and BASIC. This loop structure ensures that the statements within the loop are executed at least once before checking the condition for exiting the loop. In this case, the loop will continue repeating until the value of the variable "name" equals 0. Once the condition is met, the loop terminates.
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