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Programming revision

Programming revision. Revision tip: Focus on the things you find difficult first. “Every lesson counts – don’t waste a minute.”. Flowcharts. Exam tip: If you are asked to draw a flowchart try use the correct Symbols, but it is the logic that will be tested.

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Programming revision

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  1. Programming revision Revision tip: Focus on the things you find difficult first.

  2. “Every lesson counts – don’t waste a minute.”

  3. Flowcharts. Exam tip: If you are asked to draw a flowchart try use the correct Symbols, but it is the logic that will be tested. 1. Draw a flowchart to describe the following process: Input 5 values Output their average (4 marks) 2. Draw a flowchart to describe the following process: Input radius for a circle. Check it is positive. Reject and ask for input if not positive. Output the circumference of the circle if positive. (4 marks)

  4. Pseudocode. Exam tip: Always use indents to show loops and conditions when writing pseudocode. • Write a pseudocode algorithm to describe how to get the information and output the area of a triangle. • (3 marks) • Write the pseudocode to describe how to calculate the average of 10 numbers. • (6 marks) Exam tip: You should be able to state the advantages / disadvnatges when asked to compare translators. Programming languages. • Compare an interpreter and a compiler for use by a student learning to program. • (4 marks) • ……………………………………………………... • ...…………………………………………………... • ……………………………………………………… • ...…………………………………………………… • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • What are the main advantages of a high-level langauge over a low-level langauge? • (4 marks) • ……………………………………………………... • ...…………………………………………………... • ……………………………………………………… • ...…………………………………………………… • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • What are the advantages of compiling code for commercial distribution? • (4 marks) • ……………………………………………………... • ...…………………………………………………... • ……………………………………………………… • ...…………………………………………………… • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • ............................................................................. • .............................................................................

  5. Integrated Development Environment (IDE) Exam tip: You should be able to identify the features of an IDE and explain how the features help a developer create a program more effectively. • What are the main features of an IDE? • (4 marks) • ……………………………………………………............................................. • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • How do the features of an IDE help to create maintainable code? • (4 marks) • ……………………………………………………............................................. • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... • ...................................................................................................................... Control flow in imperative languages. Exam tip: You should be able to identify the three different types of control flow (sequence, selection, iteration) from a piece of Code. • Write the pseudocode using a Repeat-until loop to output the first five square numbers. • (2 marks) • Identify which control flow the following programs will use: • (3 marks) • (a) Deciding whether to give a discount to a • customer for having a loyalty card. • ……………………………………………………... • ...…………………………………………………... • (b) Inputting 10 numbers to be totalled. • ……………………………………………………... • ...…………………………………………………... • (c) Setting up the computer when it is switched • on. • ……………………………………………………... • ...…………………………………………………... • Repeat question 2 but this time use a While-Endwhile loop. • (3 marks)

  6. Data types. Exam tip: You will be expected to identify the most suitable data type for a variable. Remember telephone numbers and other numbers used purely for identification should be stored as strings. • An online retailer keeps data about stock in their database. Items of stock are identified by a single letter, F for furniture, G for garden, P for pet, followed by a four digit number. They also store the quantity in stock, the retail price and whether there are more on order or not. • Complete the information in this table. • (3 marks) Exam tip: Learn the definitions for the data types and for variables and for constants. Variables & constants. 2. Describe the difference between a variable and a constant. (2 marks) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3. What is a variable? (2 marks) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4. What data type will be used for RetailPrice and why? (2 marks) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ • Constant VAT = 0.2 • INPUT WholesalePrice • RetailPrice = WholesalePrice + WholesalePrice * VAT • OUTPUT RetailPrice • In the code above: • (a) Identify a constant. • ……………………………………………………... • ...…………………………………………………... (1 mark) • (b) Identify the variables. • ……………………………………………………... • ...…………………………………………………... (1 mark)

  7. Operations. Exam tip: Note if num1 ad num2 are integers, +, -, *, MOD and DIV will return integer values but / may not and the result could be a real number (float). What value is stored in the variable result if: (6 marks) (a) Result = 7/2 ……………… (b) Result = 27 MOD 4 ……………… (c) Result = 36 MOD 6 ……………… (d) Result = 23 DIV 4 ……………… (e) Result = 36 DIV 6 ……………… Operator priority. Comparison operators. What value is stored in the variable result if: (6 marks) (a) Value = 17-3*4 ……………… (b) Value = (17-3)*4 ……………… (c) Value = 7*8/2 ……………… (d) Value = 7+8/4 ……………… (e) Value = 17 MOD 3 + 4 ……………… (f) Value = 17 MOD (3+4) ...................... What value is stored in the variable result if: (6 marks) (a) num1 > num2 if num1 = 7 and num2 = 5 ……………… (b) num1 <= num2 if num1 = 7 and num2 = 5 ……………… (c) num1 < > num2 if num1 = 7 and num2 = 5 ……………… (d) num1 < > num2 AND num 1 < num2 if num1 = 7 and num2 = 5 .............. (e) num1 < > num2 OR num1 = num2 if num1 = 7 and num2 = 5 ................

  8. Testing. Exam tip: You will be expected to identify the most suitable data type for a variable. Remember telephone numbers and other numbers used purely for identification should be stored as strings. 1. What is meant by a syntax error? Give an example. (2 marks) ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 2. What is meant by a run-time errorr? Give an example. (2 marks) ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 3. A = 3 B = 5 A + B = C The above code contains an error. What is the error and what type of error is it? (2 marks) ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 4. INPUT customer INPUT cash IF customer = ‘yes’ AND cash > 50 THEN rate = 11 ELSE IF customer = ‘no’ AND cash < 50 THEN rate = 9 ELSE rate = 10 ENDIF ENDIF OUTPUT cash * rate For the algorithm opposite state what the output will be for the following input values: (a) Customer = no, cash = 20 ....................... (1 mark) (b) Customer = yes, cash = 100 ....................... (1 mark) (c) Customer = yes, cash = 20 ....................... (1 mark) (d) Customer = no, cash = 60 ....................... (1 mark)

  9. Past paper exam questions. 2011 past paper.

  10. Past paper answers. 2011 past paper. Notes: What do I need to improve?

  11. Past paper exam questions. 2012 past paper.

  12. Past paper exam questions. 2012 past paper.

  13. Past paper answers. 2012 past paper. Notes: What do I need to improve?

  14. Past paper answers. 2012 past paper. Notes: What do I need to improve?

  15. Past paper exam questions. 2013 past paper.

  16. Past paper exam questions. 2013 past paper.

  17. Past paper answers. 2013 past paper. Notes: What do I need to improve?

  18. Past paper answers. 2013 past paper. Notes: What do I need to improve?

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