Converting a flowchart to pseudocode

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. A flowchart has a diamond that asks 'Mark >= 50?' with a Yes branch and a No branch. Which pseudocode does it become?

A FOR Mark <- 50 TO ... NEXT Mark

B IF Mark >= 50 THEN ... ELSE ... ENDIF

2. In a flowchart, the flow line leaves a diamond, goes through some processes, and then returns to the same diamond. Which loop is this?

A WHILE ... DO ... ENDWHILE

B REPEAT ... UNTIL

3. In a flowchart, the processes come first. A diamond after them sends the 'No' flow line back up to the first process. Which loop is this?

A WHILE ... DO ... ENDWHILE

B REPEAT ... UNTIL

4. You have turned a flowchart's decision diamond into an IF statement. What must you add at the end?

A ENDIF

B ENDWHILE

5. A flowchart parallelogram contains the text 'Output Total'. Which line of pseudocode matches it?

A OUTPUT Total

B INPUT Total

Match the Pairs

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

Left column		Right column
1Diamond: Mark >= 50? Yes → OUTPUT "Pass", No → OUTPUT "Fail"		AConvert the diamond into IF ... THEN ... ELSE ... ENDIF, with each branch becoming its own statement
2Diamond: Count < 10? Yes → process → arrow back above the diamond		BREPEAT INPUT Number UNTIL Number >= 1
3A flowchart loop tests at the bottom, and a back arrow returns when the answer is No (invalid), so it becomes a REPEAT loop		CThe ENDIF is missing, so the decision from the flowchart is not closed
4Every statement in a flowchart must be written with the keywords in capitals once it is turned into pseudocode		DA FOR loop is closed with NEXT, not ENDFOR, so the wrong closing keyword was written
5IF Age >= 18 THEN OUTPUT "Adult" ELSE OUTPUT "Child"		EIF Score > 70 THEN OUTPUT "Merit" ENDIF
6FOR Count ← 1 TO 5 OUTPUT Count ENDFOR		FA back arrow to before the test means a loop; testing first with Yes continuing the loop gives WHILE ... DO ... ENDWHILE

Definitions

Flowchart to pseudocode

Fill in the Blanks

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

IF Mark >= 50 THEN OUTPUT "Pass" _____

_____ Lives > 0 DO Lives ← Lives - 1 ENDWHILE

REPEAT INPUT Guess _____ Guess = 7

FOR Count ← 1 TO 5 OUTPUT Count ____ Count

INPUT Num Total ← Total + Num ______ Total

Spot the Error

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

Question 1

A INPUT Mark

B IF Mark >= 50 THEN

C OUTPUT "Pass"

D ENDWHILE

E OUTPUT "Done"

Question 2

A Count ← 0

B WHILE Count < 5 DO

C output Count

D Count ← Count + 1

E ENDWHILE

Question 3

A if Score > 90 THEN

B OUTPUT "Top"

C ENDIF

Question 4

A Total ← 0

B FOR Num ← 1 UNTIL 10

C Total ← Total + Num

D NEXT Num

Question 5

A IF Age >= 18

B OUTPUT "Adult"

C ELSE

D OUTPUT "Child"

E ENDIF

Answer Key

Converting a flowchart to pseudocode

Section A: Quick Questions

B — IF Mark >= 50 THEN ... ELSE ... ENDIF

A — WHILE ... DO ... ENDWHILE

B — REPEAT ... UNTIL

A — ENDIF

A — OUTPUT Total

Section B: Match the Pairs

Diamond: Mark >= 50? Yes → OUTPUT "Pass", No → OUTPUT "Fail" → Convert the diamond into IF ... THEN ... ELSE ... ENDIF, with each branch becoming its own statement

Diamond: Count < 10? Yes → process → arrow back above the diamond → A back arrow to before the test means a loop; testing first with Yes continuing the loop gives WHILE ... DO ... ENDWHILE

A flowchart loop tests at the bottom, and a back arrow returns when the answer is No (invalid), so it becomes a REPEAT loop → REPEAT INPUT Number UNTIL Number >= 1

Every statement in a flowchart must be written with the keywords in capitals once it is turned into pseudocode → IF Score > 70 THEN OUTPUT "Merit" ENDIF

IF Age >= 18 THEN OUTPUT "Adult" ELSE OUTPUT "Child" → The ENDIF is missing, so the decision from the flowchart is not closed

FOR Count ← 1 TO 5 OUTPUT Count ENDFOR → A FOR loop is closed with NEXT, not ENDFOR, so the wrong closing keyword was written

Section C: Definitions

Flowchart to pseudocode — Follow the flow lines and turn each symbol into a statement. A diamond becomes IF, a back arrow shows a loop, and you add ENDIF, NEXT, ENDWHILE or UNTIL. Write keywords in capitals.

Section D: Fill in the Blanks

IF Mark >= 50 THEN
  OUTPUT "Pass"
ENDIF

WHILE Lives > 0 DO
  Lives ← Lives - 1
ENDWHILE

REPEAT
  INPUT Guess
UNTIL Guess = 7

FOR Count ← 1 TO 5
  OUTPUT Count
NEXT Count

INPUT Num
Total ← Total + Num
OUTPUT Total

Section E: Spot the Error

D — The diamond became an IF, so the decision must be closed with ENDIF. ENDWHILE belongs to a WHILE loop. The line should be ENDIF.

C — Keywords must be written in capitals when converting a flowchart to pseudocode. The line should be OUTPUT Count.

A — The decision diamond becomes an IF statement, and keywords must be in capitals. The line should be IF Score > 90 THEN.

B — A counted loop in a flowchart becomes FOR ... TO ... NEXT. UNTIL belongs to REPEAT. The line should be FOR Num ← 1 TO 10.

A — The Yes branch of the diamond starts after THEN, so the keyword THEN is needed at the end of the IF line. The line should be IF Age >= 18 THEN.