FOR…TO…NEXT count-controlled loop
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line correctly closes this loop? FOR Count <- 1 TO 10
2. How many times does this loop run? FOR Count <- 1 TO 10
3. How many times does this loop run? FOR Num <- 3 TO 7
4. Which NEXT line matches this loop? FOR Index <- 1 TO 5
5. By how much does the counter change each time round a FOR loop with no STEP?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1FOR Count <- 1 TO 10 | AFOR Count <- 1 TO 5 OUTPUT Count NEXT Count | |
| 2NEXT Count | BThe loop has no NEXT Count line, so it is never closed. | |
| 3A loop that must run exactly 5 times, with the counter going 1 to 5 | CStarts a loop that repeats the indented lines 10 times, with Count going 1, 2, 3 ... 10 | |
| 4A loop from 3 to 7 runs 5 times because end - start + 1 = 5 | DEnds the FOR loop and names the same counter that the FOR line used | |
| 5FOR Count <- 1 TO 10 OUTPUT Count NEXT Counter | ENEXT names a different variable (Counter) from the one in the FOR line (Count). The counter names must match. | |
| 6FOR Count <- 1 TO 10 OUTPUT Count | FFOR Num <- 3 TO 7 OUTPUT Num NEXT Num |
C
Definitions
FOR Count <- 1 TO 10
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
FOR Count __ 1 TO 10
OUTPUT Count
NEXT Count
2.
FOR Count <- 1 __ 10
OUTPUT Count
NEXT Count
3.
FOR Count <- 1 TO 5
OUTPUT "Hello"
____ Count
4.
FOR Count <- 1 TO 10
OUTPUT Count * 2
NEXT _____
5.
FOR Num <- 1 TO _
OUTPUT "Go"
NEXT Num
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
FOR Count <- 1 TO 5
B
OUTPUT Count
C
NEXT Total
Question 2
A
FOR Num = 1 TO 3
B
OUTPUT Num * 2
C
NEXT Num
Question 3
A
Total <- 0
B
FOR Count <- 1 UNTIL 4
C
Total <- Total + Count
D
NEXT Count
E
OUTPUT Total
Question 4
A
FOR Count <- 1 TO 6
B
OUTPUT Count
C
ENDFOR
Question 5
A
Sum <- 0
B
FOR Index <- TO 10
C
INPUT Mark
D
Sum <- Sum + Mark
E
NEXT Index
Answer Key
FOR…TO…NEXT count-controlled loop
Section A: Quick Questions
Q1
A — NEXT Count
Q2
A — 10 times
Q3
A — 5 times
Q4
B — NEXT Index
Q5
B — It goes up by 1
Section B: Match the Pairs
Q1
FOR Count <- 1 TO 10 → Starts a loop that repeats the indented lines 10 times, with Count going 1, 2, 3 ... 10
Q2
NEXT Count → Ends the FOR loop and names the same counter that the FOR line used
Q3
A loop that must run exactly 5 times, with the counter going 1 to 5 → FOR Count <- 1 TO 5
OUTPUT Count
NEXT Count
Q4
A loop from 3 to 7 runs 5 times because end - start + 1 = 5 → FOR Num <- 3 TO 7
OUTPUT Num
NEXT Num
Q5
FOR Count <- 1 TO 10
OUTPUT Count
NEXT Counter → NEXT names a different variable (Counter) from the one in the FOR line (Count). The counter names must match.
Q6
FOR Count <- 1 TO 10
OUTPUT Count → The loop has no NEXT Count line, so it is never closed.
Section C: Definitions
Q1
FOR Count <- 1 TO 10 — A count-controlled loop that repeats the indented lines end - start + 1 times, adding 1 to the counter each time. It is closed by NEXT Count, which names the same counter.Section D: Fill in the Blanks
Q1
FOR Count <- 1 TO 10
OUTPUT Count
NEXT CountQ2
FOR Count <- 1 TO 10
OUTPUT Count
NEXT CountQ3
FOR Count <- 1 TO 5
OUTPUT "Hello"
NEXT CountQ4
FOR Count <- 1 TO 10
OUTPUT Count * 2
NEXT CountQ5
FOR Num <- 1 TO 5
OUTPUT "Go"
NEXT NumSection E: Spot the Error
Q1
C — NEXT must name the same counter that FOR started with. It should be NEXT Count, not NEXT Total.
Q2
A — A FOR loop gives the counter its start value with the assignment arrow <-, not =. It should be FOR Num <- 1 TO 3.
Q3
B — A FOR loop uses the keyword TO between the start and end values. UNTIL belongs to REPEAT...UNTIL. It should be FOR Count <- 1 TO 4.
Q4
C — Cambridge pseudocode closes a FOR loop with NEXT followed by the counter name, not ENDFOR. It should be NEXT Count.
Q5
B — The FOR line needs a start value after <-. It should be FOR Index <- 1 TO 10, so the loop runs 10 times.