Class 12 Computer Science 083 Chapter 3 – Working with Functions Sumita Arora Book Exercise Solution

Question – 7: Predict the output of the following code :

Answer: Output:-

y = 5 a = 10

y = 10 a = 2

a + y = 12

y = 5 a = 10

Question – 8: What is wrong with the following function definition?

def addEm(x, y, z):
      return x + y + z
      print("the answer is", x + y + z)

Answer: The control can not reach the print( ) statement. It should be written before return statement.

def addEm(x, y, z):
       print("the answer is", x + y + z)
       return x + y + z

Question – 9: Create a Function that takes no parameter and returns None.

Answer: –

def fun():
     return None

Question – 10: Consider the code given (for code refer to book) and answer the questions –

(i) When the code is above executed, what prints out?

Answer: Output:- 5 times 5 = 25

(ii) What is the variable output equal to after the code is executed?

Answer: The value of variable output is 25

Question – 11: Same as Q 10

Answer: –

Question – 12: Find the errors [for code refer to book]-

(a)

Answer: – (a) Missing of colon , in function header. It should be –

def minus (total, decrement ) :

(b) and (c)

Answer: – (b) Error i -> In place of define write def in function header. Error ii-> Missing of colon , in function header. Error iii -> N is string can not be used in arithmetic expression. Error iv -> Return should be return.

Corrected code is:-

def check( ):    # Error (i) & (ii)
     N = input('Enter N :')
     i = 3
     answer = 1 + i ** 4 / int(N)    #Error (iii)
     return answer     #Error (iv)

(c)

Answer: – (c) Error i -> In function alpha, return statement used two times. It should be one time.

Error ii -> In function beta, Name Error – name ‘n’ is not defined.

Error iii -> Invalid use of : inside the print() .

Error iv -> Invalid use of : inside the print() .

Question – 13: Draw the environment variable

Answer: uploading soon

Question – 14: Draw flow of execution of above code

Answer: 12 -> 1 -> 2 -> 3 -> 4 -> 12 -> 6 -> 7 -> 12 -> 9 -> 10 -> 1 -> 2 -> 3 -> 4 -> 10 -> 6 -> 7 -> 10 -> 12

Question – 15: In the given code, which variables are in the same scope?

Answer: a & b, and c & d

Question – 16: Write a program with a function that takes an integer and prints the number that follows after it. Call the function with these arguments.

4, 6, 8, 2 + 1, 4 – 3 * 2, -3 -2

Answer:

def printfollow(n):
    print(n+1)
printfollow(4)
printfollow(6)
printfollow(8)
printfollow(2+1)
printfollow(4-3*2)
printfollow(-3-2)

Output:

5
7
9
4
-1
-4

Question – 17: Write a program with non-void version of above function and then write the flow of execution for both the programs.

Answer:

def printfollow(n):
    retutn (n+1)
print(printfollow(4))
print(printfollow(6))
print(printfollow(8))
print(printfollow(2+1))
print(printfollow(4-3*2))
print(printfollow(-3-2))

Output

5
7
9
4
-1
-4

Flow of control of both program Q-16 & Q-17 are :

3->1->2->4->1->2->51->2->6->1->2->7->1->2->8->1->2->End of program

Question – 18: What is the output of following code fragments

(a)

def increment(n):
    n.append([4])
    return n

L = [1, 2, 3]
M = increment(L)
print(L, M)

Answer: Output:

[1, 2, 3, [4]] [1, 2, 3, [4]]

Question – 18: What is the output of following code fragments

(b)

def increment(n):
    n.append([49])
    return n[0], n[1], n[2], n[3]

L = [23, 35, 47]
m1, m2, m3, m4 = increment(L)
print(L)
print(m1, m2, m3, m4)
print(L[3] == m4)

Answer: Output:

[23, 35, 47, [49]]
23 35 47 [49]
True