All topics › OCR GCSE Computer Science › Data types and casting2.2.2 Data types and castingOCR GCSE Computer Science (J277) · Algorithms and programming (Paper 2) › Programming fundamentals
Practise Data types and casting. 12 exam-style questions plus unlimited generated ones on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.
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State the data type of the value stored in price after line 01 has been executed. String Sample questions Written for this site in the style of OCR exam questions. They are not taken from real past papers.
Question 1 Easy 4 marks
(a) Which data type is the most suitable for storing a telephone number such as 07700 900123?one box.[1]
(b) Explain why this data type is the most suitable.[2]
(c) State what is meant by casting .[1]
Show the answer and mark scheme (a) Answer: String
(b) the leading zero would be lost if it was stored as a number no calculations are carried out on telephone numbers it may contain spaces or other characters such as + (c) converting a value from one data type to another (e.g. a string to an integer) Question 2 Medium 5 marks
Look at this program.
01 age = input("Enter your age")
02 if age >= 18 then
03 print("Adult")
04 endif
05 print("You will be " + (age + 1) + " next year")(a) Explain why line 02 could cause an error.[2]
(b) Rewrite line 01 so that line 02 works correctly.[1]
(c) After line 01 has been corrected, line 05 still causes an error. Explain why, and write a corrected line 05.[2]
Show the answer and mark scheme (a) input returns a string, so age holds a string a string cannot be compared with the number 18 / the comparison is not numeric (b) age = int(input("Enter your age")) (c) age + 1 is an integer, which cannot be joined (concatenated) to a string print("You will be " + str(age + 1) + " next year") Question 3 Hard 7 marks
Look at this program.
01 items = 3
02 price = 4.5
03 total = items * price
04 msg = "Total: " + str(total)
05 paid = total > 10
06 code = "ABC123".substring(3, 3)
07 num = int(code) * 2(a) State the data type of each of these variables after the program has run: items, price, total, msg, paid, code, num.[4]
(b) State the final values of msg, paid and num.[3]
Show the answer and mark scheme (a) Answer: items integer; price real; total real; msg string; paid Boolean; code string; num integer
items and num: integer price and total: real msg and code: string paid: Boolean (b) Answer: msg = "Total: 13.5", paid = True, num = 246
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