SWIFT CHAP 07

Question 1

Looping Control Flow?

Answer 1

sequenced of looped statements wich are to be excuted until specfied condition is met

Question 2

name the two types of control flow?

Answer 2

Looping Control

Condtional FLOW Control

Question 3

for-in statement used for?

Answer 3

to iterate over s sequence of items contained in a number range or collection

Question 4

CONDITIONAL FLOW CONTROL

Answer 4

WHETHER OR NOT CODE GETS EXCUTED

Question 5

REPEAT WHILE LOOP

Answer 5

Evaluate expression while repeating code in the loop body.

Question 6

if the condition is false on the first try for of a repeat while loop what happens to code?

Answer 6

does not get executed

Question 7

breaking a loop ( {break} ) mean?

Answer 7

breaking out of code before the expression is met.

Question 8

what does the {break} statement do when it exits a loop?

Answer 8

proceeds to the next line of code.

Question 9

what does the if statement evaluate?

Answer 9

boolean true or false values.

Question 10

{continue} statement?

Answer 10

causes all remaining statements in a loop body 2 b skipped and returned to top of loop.

Question 11

after the {contiune} statement is executed what happens to the loop execution?

Answer 11

execution gets returned to the top of the loop.

Question 12

if.. else statement?

Answer 12

like the else-if statement except that specify more than two conditions.

Question 13

else.. if?

Answer 13

allows you to specify two expressions with true or false.

Question 14

if the boolean expression in an (if) statement evaluates to true or false what happens?

Answer 14

if TRUE then code is executed.

If false code is skipped.

Question 15

while loop … statement?

Answer 15

repeats a set of task, whilst a condition is met?

Question 16

why do we use a (while loop)?

Answer 16

When we don’t know the number of times a loop will be needed to while meeting a condition.

Question 17

when do we use (for…in) loops?

Answer 17

For when you know the number of loops needed.

Question 18

(For in) loops don’t require a (const) name what can you reference instead?

Answer 18

you can replace a const-name with an underscore (_)

example:

var count = 0

for _ in 1…5

{count += 1}

Question 19

decisions define what in code?

Answer 19

wich code gets executed, how man times it’s executed or if code gets bypassed while executing.

Question 20

if a continue statement is triggered execution will be skipped to up to the top an of while loop

what happens to the body loop?

Answer 20

it will get executed until the criteria is met

Question 21

a guard statement? {gaurd}

Answer 21

contains a boolean value that MUST BE TRUE in order to advance to the next line of code.

Question 22

what clause does the (guard) statement must include?

Answer 22

must include an (else) clause to be executed. incase expression is false.

Question 23

the (else) clause in a (guard) statement must include what?

Answer 23

a statement to exit the code flow

example: return, break, continue or throw statements