Trace Tables Quiz

Test your understanding of investigating algorithms using trace tables with this quiz. Remember that you can try the quiz multiple times to practice and see improvements!

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Question 1 of 6

1. Question

5 point(s)

Complete the trace table for the following algorithm using these inputs:

105,100,25,1024,472

Not every cell requires data

Count = 0

FOR Index = 1 TO 5
   Number = INPUT 'Enter a number between 100 and 1000'

   WHILE Number < 99 OR Number > 1001 DO
      Number = INPUT 'This is incorrect, please try again'
   ENDWHILE

   Num[0] = Number
NEXT Index
PRINT Index
PRINT 'numbers were larger than 500'

Count Index Number Num[0] OUTPUT

105 105

100 100

25

1024 1024

472 472

145 145 numbers were larger than 500

Correct

Incorrect

Question 2 of 6

2. Question
1 point(s)
Which of these was not a logic error in the previous question?
- The validation allowed for the number 99 & 1001
- The total number of numbers larger than 500 were not counted
- The close of the FOR loop uses the incorrect key word
- The final output printed the Index & not the count
Correct

Incorrect

Question 3 of 6

3. Question

5 point(s)

Complete the trace table for the following algorithm using these inputs:

25,17,13,22,12

Not every cell requires data

Score = 0
Total = 0

FOR Student = 1 TO 5
   Score = INPUT “Enter student’s score: “
   Total = Total + Score
NEXT Student

Avg = Total / Student
OUTPUT ”The average score was ”, Total

Score Total Student Avg OUTPUT

Correct

Incorrect

Question 4 of 6

4. Question

1 point(s)

Identify the logic error in the previous algorithm and rewrite that line of code below to correct it.

Algorithm:

Score = 0
Total = 0

FOR Student = 1 TO 5
   Score = INPUT “Enter student’s score: “
   Total = Total + Score
NEXT Student

Avg = Total / Student
OUTPUT ”The average score was ”, Total

Correct

Incorrect

Question 5 of 6

5. Question

5 point(s)

Complete the trace table for the following algorithm using these inputs:

25,17,13,22,12

Not every cell requires data

LowNum = 1000
HighNum = 0

FOR Count = 1 TO 5
   Num = INPUT “Enter number: “
   IF Num < LowNum THEN
      LowNum = Num
   IF Num > HighNum THEN
      HighNum = Num
NEXT Count

OUTPUT LowNum

Num LowNum HighNum Count

1000 0 1

Correct

Incorrect

Question 6 of 6

6. Question
5 point(s)
Complete the trace table for the following algorithm using these inputs:

5,12,7,6,11,7,5

Not every cell requires data
```
Count = 0
Arr = [0,0,0,0,0]

WHILE Count < 5 DO
   Num = INPUT “Enter number: “
   IF Num < 5 OR Num > 10 THEN
      OUTPUT “Error”
   ELSE
      Arr[Count] = Num
      Count = Count + 1
   END IF
END WHILE
```
- Count Arr Num Output
  
  0 [0,0,0,0,0] 5
  
  [ , , , , ] 12
  
  [ , , , , ] 7
  
  [ , , , , ] 6
  
  [ , , , , ] 11
  
  [ , , , , ] 7
  
  [ , , , , ] 5
  
  4 [ , , , , ]
Correct

Incorrect

Number	Num[0]	OUTPUT
105	105
100	100
25
1024	1024
472	472
145	145	numbers were larger than 500

Count	Arr	Num
0	[0,0,0,0,0]	5
	[ , , , , ]	12
	[ , , , , ]	7
	[ , , , , ]	6
	[ , , , , ]	11
	[ , , , , ]	7
	[ , , , , ]	5
4	[ , , , , ]