Repetition part 1

Question 1

Pseudo Code

Answer 1

fake code

Question 2

write me a sentinel loop that add all the numbers tgt

Answer 2

Question 3

Loop in a branch example

Answer 3

Question 4

Branch in a loop example

Answer 4

Question 5

end=” “ vs end=””

Answer 5

1 odd and 1odd

Question 6

’<’ not supported between

Answer 6

instances of ‘str’ and ‘int’

Question 7

wrire a code that adds all the sum of the number u enter before it. For ex: enter 4 (1+2+3+4)

Answer 7

Question 8

When there is no branching/loops, the code runs….

Answer 8

Top to bottom (Sequential)

Question 9

whether or not a part of the program repeats is determined by

Answer 9

a loop control

Question 10

For loops: (2)

What it can do

Answer 10

• can count through a numerical sequence (1,2,3)
• iterate the sequence of characters in a string

Question 11

For loops can only count trhough a

Answer 11

mumerical sequence through a sequence of addition or subtraction

Question 12

While loop (2)

when it can be used

Answer 12

can be used any time repetition is needed
- can be used if its not know in advance how many times that loop will repeat

Question 13

give me a countdown while loop example:

Answer 13

Question 14

you cannot implement —– in For loop

Answer 14

logic

Question 15

The only mathmatical operation you can do with For loop is

Answer 15

addition/subtraction

Question 16

give me a countdown for loop

Answer 16

Question 17

Erroneous FOR loops (2)

What it is +ex

Answer 17

the logic of the loop is sucg tgat the end condition has already been reached with the start condition
- ex: when the programmer combine a loop that combines counting up with a loop that counts down

Question 18

while loop counting up/down pseudo code

Answer 18

starting value
end value
counting up/down by

Question 19

Sentinel controlled loops

when does it stop?

Answer 19

the stopping consition for the loop occurs when the sentinel value is reached (less then 0)

Question 20

Post Test Loops (3)

Python+when to use (2)?

Answer 20

• python doesnt have one
• used if you need a loop to always execute at least once even if the Boolean expression evaluated to false the first time that the loop is encountered.
• You want to check the body of the loop before checking the stopping condition

Question 21

Post test loop are guaranteed execution because:

Answer 21

The Boolean expression is checked after the body executes

Question 22

Give me an example of a post test loop

Answer 22

Question 23

How to make a post test loop

Answer 23

• prime the loop control so its guarantee execution

Ex: age<1 (LOOP CONTROL)
while (age<0)
print(“Type in answer”)

Question 24

Pre- test loop

When is it used?

Answer 24

• you want the stopping condition to be checked before the loop body is executed (Used when you want a loop to execute zero or more times)

Question 25

Pre- test loop executes

+ ex:

Answer 25

zero or more times
age = 12
while (age< 0):