11th Standard Syllabus & Materials

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TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A

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TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A

11th Standard English Medium Computer Science Subject Iteration and recursion Book Back 2 Mark Questions with Solution

Published on: 09/06/2021

QB365 provides detailed and simple solution for every book back questions in class 11 Computer Science subject.It will helps to get more idea about question pattern in every book back questions with solution.

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Std: 11th Standard - Computer Science

chapter: - Book back Questions

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Questions:

Generic 2

5 x 2 = 10

What is recursive problem solving?

What is the relationship between loop invariant, loop condition and the input-output recursively?

Does testing the loop condition affect the loop invariant? Why?

Define a loop invariant.

What is an invariant?

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Answers Key:

Generic 2

5 x 2 = 10

1. Recursion is a method of solving problems that involves breaking a problem down into smaller and smaller sub problems until user gets in to a small problem that it can be solved trivially.
2. Usually recursion involves a function calling itself. While it may not seem like much on the surface, recursion allows us to write elegant solutions to problems that may otherwise be very difficult to program.

A loop invariant is a condition [among program variables] that is necessarily true immediately before and immediately after, each iteration of a loop. A loop invariant is some condition that holds for every iteration of the loop.

No, the loop condition do not affect the loop invariant. Because the loop invariant is true at four points.
(i) at the start of loop
(ii) at the start of each iteration
(iii) at the end of each iteration
(iv) at the end of the loop

In iteration, the loop body is repeatedly executed as long as the loop condition is true. Each time the loop body is executed, the variables are updated.
However, there is also a property of the variables which remains unchanged by the execution of the loop body. This unchanging property is called the loop invariant.

An expression involving variables, which remains unchanged by an assignment to one of these variables is called as an invariant of the assignment.