AP1 Paper 2 Computer Science

Identify whether the OCR Reference Language code given is an example of selection or iteration.

Groups:

(a) Selection

,

(b) Iteration

• whilescore != 0
     playgame()
  endwhile

• if playerHit() then
     score = 0
  endif

• for i = 1 to 10
     print(i)
  next i

• switch bonus:
     case 0:
      score = 9
     case 1:
      score = 7
     case 2:
      score = 5
  endswit

Write pseudocode to increment a value held in a variable score by one.

Breaking a complex problem down into smaller problems.

Hiding or removing irrelevant details from a problem to reduce the complexity.

A restaurant needs an algorithm designing to help employees work out if a customer can have a half price meal or not. It should:

•input required data

•decide if the customer is entitled to a discount

•output the result of the calculation.

Design the algorithm using a flowchart.

a

b

c

d

e

If day NOT "saturday"

INPUT discCard

Output "half price"

Output "Full price"

End

Each member of staff that works in a restaurant is given a Staff ID. This is calculated using the following algorithm.

Identify the three different variables used.

g

h

i

year

=

endwhile

surname

while

str

staffID

print

str(year)

input

Each member of staff that works in a restaurant is given a Staff ID. This is calculated using the following algorithm.

Identify the first three different operators used

c

b

a

surname

endwhile

str

str(year)

year

<

while

=

+

input

• Casting has been used in this code. Casting means changing data from one data type to another. On what line number has Casting been used?

• Concatenation is the operation of joining character strings end-to-end. For example, the concatenation of "snow" + "ball" is "snowball". The concatenation of "Thompson " + "is" + "Jedi" is "ThompsonisJedi".

• The concatenation of "Thompson " + "is " + " Jedi". Note the spaces results in "Thompson is Jedi".

• Concatenation has been used on three lines. Identify in the code where has Concatenation been used?

01 surname = input(“Enter surname”)
02 year = input(“Enter starting year”)

03 staffID = surname + str(year)
04 while staffID.length < 10
05   staffID = staffID + “x”
06 endwhile
07 print(“ID ” + staffID

Complete the trace table for the given algorithm when the surname “Kofi” and the year 2021 are entered.

e

f

g

h

i

j

Kofi

2022

Kofe

Kofi2021 

ID Kofi

Kofi2021xx

KofiID

ID Kofi2021xx 

2021

Kofi2021x