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Year 8 Computing — Variables in a program

Follow what a named value holds as a program changes it line by line, and say what it holds at the end.

Name: ________________________

  1. 1.Put these four lines in an order that leaves total holding 14 and then shows it.

    • add 8 to total
    • set total to 0
    • add 6 to total
    • print total

  2. 2.Sort each line by whether it changes what total holds.

    Groups: Changes it · Leaves it as it was

    • take 2 away from total
    • show total on the screen
    • print total
    • add 5 to total
    • set total to 0
    • compare total with 10

  3. 3.A program says: set a to 6; set b to 4; set a to a plus b. What does a hold now?

  4. 4.A program says: set a to 2; set b to 5; set c to a plus b; set a to 10. What does c hold now?

  5. 5.A program says: set n to 12; take 4 away from n; take 3 away from n. What does n hold now?

  6. 6.A program says: set a to 6; set b to 4; set a to a plus b. What does b hold now?

  7. 7.A program says: set score to 5; add 3 to score. What does score hold now?

  8. 8.A program says: set price to 20; set price to price times 2. What does price hold now?

    • a) 20
    • b) 40
    • c) 22
    • d) 2

Answer key — Year 8 Computing — Variables in a program

  1. 1. 1. set total to 0 2. add 6 to total 3. add 8 to total 4. print total
    Also accepted, in full:
    • 1. set total to 0 2. add 8 to total 3. add 6 to total 4. print total
  2. 2. add 5 to total → Changes it; print total → Leaves it as it was; set total to 0 → Changes it; show total on the screen → Leaves it as it was; take 2 away from total → Changes it; compare total with 10 → Leaves it as it was
  3. 3. 10
  4. 4. 7
  5. 5. 5
  6. 6. 4
  7. 7. 8
  8. 8. b) 40