T7 - Sequence/Selection and Iteration

Question 1

Three operators used in Boolean expressions?

Answer 1

AND, OR, NOT

Question 2

3 basic control structures used in programming:

Answer 2

Sequence, selection and iteration

Question 3

Sequence:

Answer 3

The statements are executed
one by one in the order they are written

Question 4

Selection -

Answer 4

next statement to be executed depends on whether the condition being tested is True or False

Question 5

selection eg

Answer 5

Eg if statements (allow different branches to be executed based on the result of a Boolean expression)

Question 6

==

Answer 6

equal to

Question 7

!=

Answer 7

not equal to

Question 8

>

Answer 8

greater than

Question 9

greater than or equal to

Answer 9

> =

Question 10

<

Answer 10

lesser than

Question 11

lesser than or equal to

Answer 11

<=

Question 12

AND

Answer 12

return as true if both conditions are true

Question 13

OR

Answer 13

returns as true as long as one is true

Question 14

NOT

Answer 14

returns the opposite value

Question 15

Random numbers:
in Python,

Answer 15

import random to access library (numbers)
or
random.randint(0, 100) to generate range

Question 16

random numbers - Pseudocode

Answer 16

random(0, 100)

Question 17

To generate a decimal number

Answer 17

use range -100.0 and 100.0,

Question 18

Iteration

Answer 18

• repetition of a section of code

Question 19

iteration eg

Answer 19

Eg:
for … next
while … endwhile
do … until (not in python)

Question 20

For loops -

Answer 20

when you want to execute the loop a specified number of times
Use i in rage

Question 21

While loops -

Answer 21

when you want to execute the loop while a certain condition is true.

Question 22

infinite loop -

Answer 22

If a loop continues forever and there is no way to exit it

Question 23

while loop is tested when

Answer 23

the condition is tested at the beginning of the loop

Question 24

do … until loops:

Answer 24

when you want to execute the loop until a certain condition is True

Question 25

do … until loops: tested when

Answer 25

The condition is tested at the end of the loop