paper 2 - OCR reference language

Question 1

how do you declare a constant in the OCR reference language?

Answer 1

using the keyword const (e.g. const pi = 3.14

Question 2

how can variables in the main program can be made global in OCR reference language?

Answer 2

with the keyword global (e.g. global userID = 123)

Question 3

what would 13MOD5 give?

Answer 3

3

Question 4

what would 17DIV5 give?

Answer 4

3

Question 5

give a statement in OCR reference language that will print “Hello” 8 times.

Answer 5

for i=0 to 7
print (“Hello”)
next i

Question 6

what does the ‘step 2’ command do in for loops in OCR reference language? Explain an example of it being used

Answer 6

it increases the counter (i) by 2 each time. E.g., the program:
for i=0 to 7 step 2
print (“Hello”)
next i
Will print “Hello” 4 times, because the step 2 command increases the counter (i) by 2 each time.

Question 7

give an example of a DO…UNTIL loop in OCR reference language

Answer 7

do
answer = input(“New answer”)
until answer != “Correct”

Question 8

which command will return the length of the string in OCR reference language?

Answer 8

stringname.length (e.g. the program
subject = “Computer Science”
print (subject.length)
would return 15)

Question 9

how would you print a substring in OCR reference language?

Answer 9

stringname. subString (startingPosition, numberOfCharacters)
e. g. when subject = “Computer Science”, subject.substring(3,5) will return “puter” (remember it starts at the 0th character)

Question 10

when subject = “Computer Science”, what would subject.left(4) return?

Answer 10

“Comp”

Question 11

when subject = “Computer Science”, what would subject.right(3) return?

Answer 11

“nce”

Question 12

how would you convert the variable Subject into upper case letters?

Answer 12

Subject.upper

Question 13

how would you convert the variable Subject into lower case letters?

Answer 13

Subject.lower

Question 14

in OCR reference language, what command is used to open a file to read from?

Answer 14

open(“filename.txt”)

Question 15

In OCR reference language, which command would be used to return a line of text from the file myFile?

Answer 15

x = myFile.readLine()

Question 16

what is the command endOfFile used for in OCR reference language?

Answer 16

it is used to determine the end of the file, for example, myFile.endOfFile will return true if the program has reached the end of the file

Question 17

write a program to print out the contents of a file called sample.txt

Answer 17

myFile = open("sample.txt")
while NOT myFile.endOfFile()
	print(myFile.readLine())
endwhile
myFile.close()

Question 18

what command is used to write to a file in OCR reference language?

Answer 18

writeLine
e.g. myFile = open("sample.txt")
myFile.writeLine("Hello World")
myFile.close()
would make "Hello World" the contents of sample.txt (any previous contents are overwritten)

Question 19

how are arrays declared in OCR reference language?

Answer 19

with the keyword ‘array’. e.g. array people[5] would create an array called ‘people’ with 6 spaces (it is 0 based)

Question 20

how do you declare a 2D array in OCR reference language?

Answer 20

array arrayName[no. of records, no. of fields]
e.g. array board [8,8]
board [0,0] = “rook”

Question 21

how do you define a function in OCR reference language?

Answer 21

function functionName(parameter)
e.g. function triple(number) creates a function called 'triple' that takes 'number' as an argument

Question 22

how do you call a procedure in OCR reference language?

Answer 22

procedure procedureName(parameter)
e.g. procedure greeting(name) would create a procedure called 'greeting' that takes the parameter 'name'

Question 23

how would you cast the string “3” as an integer in OCR reference language?

Answer 23

int(“3”)

Question 24

how would you cast the string “3.14” into a float in OCR reference language?

Answer 24

float(“3.14”)

Question 25

how would you cast the integer 3 into a string in OCR reference language?

Answer 25

str(3)

Question 26

using the OCR reference language, how would you create a random number between 1 and 6 inclusive?

Answer 26

number = random(1,6)