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NAME CS110 Review Guide Worth 1 quiz Grade
Date________________
Q1. How many comparisons are required to search the following names using binary search and sequential search in the following list of names
Q1 IS TO BE TAUGHT ON MONDAY
Aaron
Cinthia
Don
Eric
Gerald
Harry
Holly
Kevin
Luna
Melissa
Molly
Neil
Pamela
Tim
Venus
NUMBER OF COMPARISIONS
BINARY SEARCH SEQUENTIAL SEARCH
Q2a. Print the messages that the following program prints. Also provide the values for A, B, C and D after the following piece of code is executed.
A= 3
B=9
C=11
D=19
if ( A>B)
print “Don’t mess with A”
else
print “B might be the greatest”
if (A > B )
C = A –B
else
C = A + B
D = C +1
Q2b. What are the values of the variables x and count after the loop is executed.
x=1
count = 2
while ( count < 5 )
x = x + 3
count = count +1
Q2c. What gets printed after the following segment of code is executed?
x=2
while (x < 5 )
x = 2 *x +1
print “Value of x is “, x
Q3. Consider the following code segment and indicate what gets printed.
a.)
i = 5
j= 6
k = 7
if (i < j ) and (k < 5 )
print “YES”
else
print “NO”
b. )
i= 5
j = 6
k=7
if (i < j) or (k < 5 )
print “YES”
else
print “NO”
Q4. The following code segment has a function definition and a function call from the main program. Indicate where the following are in the code
.
def rectangle_area (length , width )
area = 0
area = length * width
print “ Program to compute the area of a rectangle “
rectangle_area(20,25)
def rectangle_area (length , width )
area = 0
area = length * width
print “ Program to compute the area of a rectangle “
rectangle_area(20,25)
e. Does the procedure print the values after calculating the area? If it doesn’t then add the code to print the value of area of the rectangle inside the procedure.
f. Indicate what changes need to be made if the procedure needs to be modified to return a value to the main program so that the area can be printed in the main program.
Q5. The procedure modify is defined by
def modify ( y)
y = 10
print” the value of y is “, y
a. If parameters are passed by value, what values of x and y will be printed when the following program segment is executed?
def modify ( y)
y = 10
print” the value of y is “, y
x = 15
modify ( x )
print “the value of x is “, x.
b. If the procedure modify is changed to
def modify ( y )
y = 10
print “the value of y is”, y
return y
What values of x and y variables gets printed when the following program is executed?
def modify ( y)
y = 10
print” the value of y is “, y
return y
x = 15
x = modify ( x )
print “the value of x is “, x
Q6. Suppose the memory cells at addresses F0 through FD in the machine
described in Appendix C contain the following bit patterns:
Address Content
A0 10
A1 A9
A2 21
A3 00
A4 22
A5 03
A6 53
A7 01
A8 54
A9 23
AA 34
AB AF
AC C0
AD 00
Assume that the machine starts with program counter equal to A0.
a. What will be the contents in the following registers when the machine halts?
Register 0= _____ , Register 1= _____ ,Register 2= _____ ,
Register 3= _____ , Register 4=_____.
c. What will be in PC when the machine halts?
Q7. Suppose the memory cells at addresses 00 through 05 in the machine contain the following bit patterns.
Address Content
00 10
01 06
02 30
03 45
04 C0
05 00
06 34
What bit pattern is in the memory cell at address 45 when the machine halts.
What bit pattern is in the program counter when the machine halts?
Q8.
a. There are three algorithms of the order O(n), O(n2 ) and O(n3 ). Which of these algorithm will be fastest with the least number of comparisons and which one will be the slowest?
b. Give one example of algorithms of order
O(n2)
O(n)
O(logn)
c. Perform the following binary additions.
10101011
+ 01011110
e. How many possible memory addresses can you generate with 7 bits?
Q9. Considering the node pointed to by the root in the binary search tree is 50, answer the following problems.
Construct a tree by adding following values in the order in which they appear
50,45,70,40,30,48,60,75
a. Indicate what positions do the keys 25, 65 and 49 will go in the above tree if added in that ordered.
b. What are the children of the node containing 60 in the above tree.
e. What are the siblings of the node with value 40?
f. What are the leaf nodes in the new tree?
g. How can the above tree be stored in an array?
Q 10 Using the following nodes make a link list.
Address Contents
14 T
15 1C
1A W
1B 1E
1C O
1D 1A
1E N
1F 4E
Address Contents
10 R
11 8E
d. What is the advantage of using linklist for data structure instead of an array?
Q11.
0 1 2 3 4 5 6
Stack Pointer
Show how stack appears and the location of stack pointer after the following operations are performed on the stack.
a. Push C
b. Push R
c. Push A
d. Pop C
e. Push C
f. Push K
g. Push L
h. Push E
Q12 Following is a queue implemented using arrays.
0 1 2 3 4 5 6
Head Pointer
a. What cell does the Tail Pointer point to ?
Draw the queue and indicate the position of the head pointer and the tail pointer after each of the following operations are performed on the above queue.
a) Enqueue W
b) Dequeue W
c) Dequeue N
d) Dequeue E
e) Enqueue Z,
f) Enqueue E
g) Enqueue A
h) Enqueue L
i) Dequeue W
j) Enqueue A
k) Enqueue N
l) Enqueue D
Q13. The following program calculates the total amount of snow for the month of January. Does the program work correctly, if not make the appropriate changes so that it calculates
i. total amount of snow.
ii. prints daily_snow amount for each day.
day_num=0
total_snow=0
daily_snow = 0
while ( day_num < 31 )
total_snow = total_snow + daily_snow
print “The total amount of snow for January is “, total_snow
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