Python Quiz 5 (Prutor Answers)

 Q:1. What does the following Python3 code do? (using python 3.X version):

n = int(input('Enter a number?'))
i = 1
while i <= n:
  i = i+1
  print (i)

1.Print all integers from 1 to n

2.Print all integers from 1 to n-1

3.Print all integers from 2 to n

4.Print all integers from 2 to n+1

Option : 4

1-If we enter the no greater than 1 while loop will executed and and first add 1 into i then print i until condition fails. So it will print all integers from 2 to n+1.

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Q:2. What will the output of the following Python3 program (using python 3.X version)?

n = 13
sum = 0
while (n > 1):
  n = n//2
  sum = sum + n
print(sum)

1.13

2.10

3.6

4.9

Option 2 

2-First it will Check while condition which is true then perform n=n//2 and 6 value assigned to n, then sum will be 6 again go to loop and check condition .This process will continue until condition is false .at the last it will be print 10.

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Q:3. What will the output of the following Python3 program? If the program has error, select the option ERROR (using python 3.X version):

n,p = 9,1
while (n >= 1):   
  n,p = n//2,n*p
  print(int(p))

1.8

2.102

3.9    
     36
     72
     72

4.Error

Option : 3

3-First it will check while condition which is true and perform operation n=n//2 and p=n*p together so n 4 will assigned to n and 9 will be assigned to p and print 9.Again go to loop and check condition and execute loop until condition is false. At last it will be print 9 36 72 72.

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Q:4. The following code should print all positive even numbers less than or equal to N. N is taken as input from the user. What should replace the X for the code to work correctly?(using python 3.X version):

N = int(input('Enter N:'))
i = 1
while ( i < N ) :
    if ( X ):
        print(i)
    i = i + 1

1.i//2 == 0

2.i%2 != 0

3.i//2 != 0

4.i%2 == 0

Option 4

4-If any no is divided by 2 completely then it is even no .So if(i%2==0) is true then it will be print even numbers till N. 

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Q:5. The following code should print all positive odd numbers less than or equal to N. N is taken as input from the user. What should replace the X for the code to work correctly? (using python 3.X version):

N = int(input('Enter N:'))
i = 1
while ( i < N ) :   
    print(i)
    X

1.i%2 == 1

2.i = i + 2

3.i = 1 + i * 2

4.i = i * 2

Option : 2

5-Here i is initialize 1 which is odd no so for print all even numbers till N add 2 in i .So answer is i=i+2.

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