Week 3 - Selection & Iteration

Question 1

Selection

Answer 1

Blocks of code having decisions or branches, where a variety of paths can be taken.

(Like in a flowchart with diamonds)

Question 2

Iteration

Answer 2

A kind of block where instructions are repeated a number of times making use of loops.

Question 3

How to represent in C if values are the same?

Answer 3

a == b

Question 4

How to represent in C if values are different?

Answer 4

a != b

Question 5

How to represent in Pascal if values are the same?

Answer 5

a = b

Question 6

How to represent in Pascal if values are not the same?

Answer 6

a <> b

Question 7

Pre-Test Loop

Answer 7

While the condition is true, it will continue to loop until met.

A pretest loop tests its condition before each iteration.

Question 8

Post-Test Loop

Answer 8

The code will end until the condition is met.

A post test loop tests its condition after each iteration.
A post test loop will always execute at least once.

Question 9

When do we use post-test loops?

Answer 9

If you want the code in the body to run at least once.

Eg: If the file has any data in it, if the network has any data available and what the user wants to do next.

Question 10

Break Statement

Answer 10

Used to jump out of a loop or if statement.

Question 11

What are the different types of values in Ruby?

Answer 11

Numerics, Integers & Arrays are the main ones

Question 12

What is the syntax of a for loop?

Answer 12

count = 0

for count in 0..4 do

(FOR the VARIABLE IN that RANGE, DO this piece of code)

Question 13

What’s the difference between “..” and “…” range?

Answer 13

.. is inclusive of the last value. Eg: 1..4 = 1, 2, 3, 4

.. is not exclusive of the last value. Eg: 1…4 = 1, 2, 3