Writing pseudocode from an IPO chart

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Quick Questions

Shade in the A or B circle for each question.

1. An IPO chart lists the input 'hourly rate'. Which pseudocode line turns it into code?

A PRINT rate

B INPUT rate

2. The IPO process column says 'total is price multiplied by quantity'. Which line does this?

A total ← price * quantity

B INPUT total

3. The IPO output column says 'display the total'. Which line matches?

A total ← INPUT

B PRINT total

4. In which order should the pseudocode follow the IPO chart?

A INPUT, then process, then PRINT

B PRINT, then process, then INPUT

5. The process column says 'if mark is 50 or more the result is Pass, otherwise Fail'. Which pseudocode fits?

A IF mark >= 50 THEN result ← "Pass" ELSE result ← "Fail" END IF

B INPUT mark >= 50

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1INPUT mark		ATurns an IPO input (a mark entered by the user) into an input statement that stores it in a variable
2PRINT result		BTurns an IPO output (the result shown to the user) into a print statement
3A process that calculates a value becomes an assignment using the arrow		CThe assignment is written backwards. The variable being assigned must be on the left of the arrow.
4A process that makes a decision becomes an IF selection		DIF mark >= 50 THEN result ← "Pass" ELSE result ← "Fail" END IF
5PRINT total total ← price * quantity INPUT price, quantity		Etotal ← price * quantity
6INPUT price price * 2 ← total PRINT total		FThe statements are in the wrong order. The output is printed before the inputs are read and the process is done.

Definitions

IPO to pseudocode

Fill in the Blanks

Complete each line of code by filling in the missing parts.

_____ price

INPUT price INPUT qty total _ price * qty

IF mark >= 50 ____ PRINT "Pass" ENDIF

INPUT total _____ total

INPUT radius area ← 3.14 * radius * radius PRINT ____

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A INPUT price

B INPUT quantity

C price * quantity ← total

D PRINT total

Question 2

A INPUT mark

B IF mark >= 50

C PRINT "Pass"

D ELSE

E PRINT "Fail"

F END IF

Question 3

A INPUT length

B INPUT width

C area ← length * width

D INPUT area

Question 4

A INPUT c

B f ← c * 9 / 5 + 32

C PRINT "f"

Question 5

A PRINT hours

B pay ← hours * 30

C PRINT pay

Answer Key

Writing pseudocode from an IPO chart

Section A: Quick Questions

B — INPUT rate

A — total ← price * quantity

B — PRINT total

A — INPUT, then process, then PRINT

A — IF mark >= 50 THEN result ← "Pass" ELSE result ← "Fail" END IF

Section B: Match the Pairs

INPUT mark → Turns an IPO input (a mark entered by the user) into an input statement that stores it in a variable

PRINT result → Turns an IPO output (the result shown to the user) into a print statement

A process that calculates a value becomes an assignment using the arrow → total ← price * quantity

A process that makes a decision becomes an IF selection → IF mark >= 50 THEN result ← "Pass" ELSE result ← "Fail" END IF

PRINT total total ← price * quantity INPUT price, quantity → The statements are in the wrong order. The output is printed before the inputs are read and the process is done.

INPUT price price * 2 ← total PRINT total → The assignment is written backwards. The variable being assigned must be on the left of the arrow.

Section C: Definitions

IPO to pseudocode — Turn each IPO input into an INPUT statement, each process into assignments or IF selection, and each output into a PRINT statement, in that order.

Section D: Fill in the Blanks

INPUT price

INPUT price
INPUT qty
total ← price * qty

IF mark >= 50 THEN
  PRINT "Pass"
ENDIF

INPUT total
PRINT total

INPUT radius
area ← 3.14 * radius * radius
PRINT area

Section E: Spot the Error

C — The process is an assignment, so the variable being set goes on the left of the arrow. It should be total ← price * quantity.

B — An IF selection needs the keyword THEN after the condition. It should be IF mark >= 50 THEN.

D — The IPO chart lists area as an output, so it needs a PRINT statement. INPUT is only for values the user supplies. It should be PRINT area.

C — Quotes make PRINT show the letter f as text. To output the calculated value, print the variable without quotes: PRINT f.

A — hours is an input in the IPO chart, so it must be read with INPUT. PRINT would just display a value that has not been entered yet. It should be INPUT hours.