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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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 
Which of these was not a logic error in the previous question?
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 

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
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  
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  [ , , , , ] 