L-9 Coding in Python / Class 8th Computer

 

Class – VIII

Subject: Computer

L-9 Coding in Python

State whether these statements are true or false.

1)    Sequence in another name for iteration.__FALSE

2)    While is a conditional loop.__TRUE

3)    There are 2 types of decision making statements in python._FALSE

4)    A list is denoted by round brackets. FALSE

A.) Test your Skills:

1)    Which of the following is not used as loop in python?

a)    For loop

b)    While loop

c)    Do-while loop

d)    None of the above

Ans: c) Do-while loop

 

2)    Which of the following is not a decision-making statement?

a)    If statement

b)    If-else statement

c)    For statement

d)    If-elf statement

Ans: c) For statement

 

3)    The order of the execution of the statements in a program is known as

a)    Flow of control

b)    Central flow

c)    Selection

d)    Iteration

Ans: a) Flow of control

 

4)    How many times will the loop run?
i=2
while (i>0)
i=i-1

a)    2

b)    3

c)    1

d)    0

Ans: c) 1

 

5)    While loop in python used for what type of iteration?

a)    Indefinite

b)    Definite

c)    Discriminant

d)    Infinity

Ans: a) Indefinite

 

B.) Fill in the blanks using the words from the help box:

[  Iteration,  Pass,    conditional,   statement  ]

 

1)    An empty statement in Python is Pass .

2)    Iteration   is another name of looping.

3)    Statement that allow you to give conditions are called conditional  .

4)    Python support  conditional   type of control structures.

 

C) State ‘T’ for True or ‘F’ False:

1)    Control statements control the flow of execution of program. TRUE

2)    ‘for’ is a conditional statement. FALSE

3)    You can not use else in while loop. FALSE

4)    A tuple is defined in a square bracket. FALSE

5)    Range function used when loop is finished. FALSE

 

 

D) Short Ans type questions:

1) What are conditional statements?

Ans: Conditional statements are programming constructs that allow you to make decisions based on certain conditions.

 

2) Difference between ‘for’ loop and while loop?

Ans: The 'for' loop is used for definite iteration, and the 'while' loop is used for indefinite iteration.

 

3) What are infinite loops?

Ans: Infinite loops are loops that continue indefinitely, never reaching a stopping condition.

 

 

 

E) Long answer type questions:

 

1) Differentiate between a tuple and list?

Ans:   A tuple is immutable (unchangeable), denoted by parentheses, and a list is mutable (changeable), denoted by square brackets.

 

2) What are iterative statement in python?

Ans:  Iterative statements in Python are loops, like 'for' and 'while' loops, that allow the execution of a block of code repeatedly.

 

F) Application based questions:

1) Your friend wants to write a program to count the number of even and odd numbers. Can you help your friend by writing the steps to do so?

Ans: # Step 1: Initialize the counters for even and odd numbers

even_count = 0

odd_count = 0

 

# Step 2: Get the range of numbers from the user

start = int(input("Enter the starting number: "))

end = int(input("Enter the ending number: "))

 

# Step 3: Iterate through the numbers in the given range

for num in range(start, end + 1):

    # Step 4: Check if the number is even or odd

    if num % 2 == 0:

        # Step 5: If even, increment the even counter

        even_count += 1

    else:

        # Step 6: If odd, increment the odd counter

        odd_count += 1

 

# Step 7: Display the results

print(f"Number of even numbers: {even_count}")

print(f"Number of odd numbers: {odd_count}")

Explanation of each step:

1.     Initialize Counters: Create variables to keep track of the count of even and odd numbers.

2.     Get User Input: Take input from the user for the starting and ending numbers to define the range.

3.     Iterate through the Range: Use a for loop to iterate through the numbers in the specified range.

4.     Check for Even or Odd: Use the modulo operator (%) to check if the current number is even or odd.

5.     Increment Even Counter: If the number is even, increment the even counter.

6.     Increment Odd Counter: If the number is odd, increment the odd counter.

7.     Display Results: After the loop completes, display the counts of even and odd numbers.

 

2) Write a program to print following pattern.

1

12

123

1234

Ans: for i in range(1, 5):

    for j in range(1, i + 1):

        print(j, end="")

    print()

 

G) Guess my name:

1) The order of the execution of the statements in a program. Flow of control

2) I am a list denoted by square bracket. List

3) I am loop also called as entry-controlled loop. For loop

4) I am loop that continues forever, and never ends. Infinite loop

5) I am statement execute in one after another. Sequential statement

 

Tech Practice:

1)    Print squares of first 5 natural numbers and cube of 5 natural numbers.

Ans: for i in range(1, 6):

    print(f"Squared: {i**2}, Cubed: {i**3}")

 

2)    Write a program to guess a number between 1 to 9.

Ans: import random

 

secret_number = random.randint(1, 9)

guess = int(input("Guess the number between 1 and 9: "))

 

if guess == secret_number:

    print("Congratulations! You guessed the correct number.")

else:

    print(f"Wrong guess. The correct number was {secret_number}.")

 

3)    Write a program to find area of triangle.

Ans: base = float(input("Enter the base of the triangle: "))

height = float(input("Enter the height of the triangle: "))

 

area = 0.5 * base * height

print(f"The area of the triangle is: {area}")

 

4)    Rama is PGT in a school. Her gross salary is Rs. 50,000. She donate 10% of her salary for the education of needy children write a program to find out the 10% of her salary.

Ans: salary = 50000

donation_percentage = 10

 

donation_amount = (donation_percentage / 100) * salary

print(f"Rama's donation amount is: Rs. {donation_amount}")

 

5)    Demonstrate the students how to use conditional, looping statements.

Ans: Provide examples and explain the use of 'if-else' statements, 'for' loops, and 'while' loops in solving problems.

 

6)    Draw the pattern given below using programming.

1

22

333

4444

Ans: for i in range(1, 5):

    for j in range(1, i + 1):

        print(i, end="")

    print()

 

7)    Draw the pattern given below using programming.

1

12

123

1234

Ans: for i in range(1, 5):

    for j in range(1, i + 1):

        print(j, end="")

    print()

 

 

8)    Draw the pattern given below using programming.

4444

333

22

1

Ans: for i in range(4, 0, -1):

    for j in range(1, i + 1):

        print(i, end="")

    print()

9)    Draw the pattern given below using programming.

1234

123

12

1

Ans: for i in range(4, 0, -1):

    for j in range(1, i + 1):

        print(j, end="")

    print()