10.10. Practice Programs

1. Print your name and age.

This exercise encourages you to create a simple program that outputs your name and age. To do this, you can use the print() function in Python. For example, if your name is 'Alice' and your age is '14', you would write:

print("My name is Alice.")
print("I am 14 years old.")

When you run the program, it will display your name and age on the screen.

Think of this like introducing yourself in a group. Just as you would say, 'Hi, I’m Alice and I’m 14 years old,' your Python program does the same but in a digital format.

2. Take user input for two numbers and display their sum.

This program involves taking two numbers from the user and calculating their sum. You can use the input() function to get user input. For instance:

# Taking user input
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))

# Calculating sum
sum = num1 + num2

# Displaying result
print("The sum is:", sum)

This will prompt the user to enter two numbers and then display the result of their addition.

Imagine you are at a shop where two people tell you how much money they have. If you are asked to find out the total amount they have, you would just add the two amounts together. Similarly, the program adds two numbers given by the user.

3. Check if a number is even or odd.

This program checks if a number entered by the user is even or odd using the modulo operator (%). An even number is divisible by 2, while an odd number is not. Here's how you can write this:

# Taking input
number = int(input("Enter a number: "))

# Checking if it's even or odd
if number % 2 == 0:
    print("The number is even.")
else:
    print("The number is odd.")

The % operator here determines whether there is a remainder when the number is divided by 2.

Think of the concept of even and odd numbers like splitting something into pairs. If you can divide the items equally into pairs without any leftover, it's even. If there's one item left over, it's odd.

4. Print numbers from 1 to 10 using a loop.

This task requires you to use a loop to print numbers sequentially from 1 to 10. A for loop is ideal for this:

for i in range(1, 11):
    print(i)

The range(1, 11) creates a sequence of numbers from 1 to 10, and the loop iterates through each number, printing it.

Imagine counting how many cookies you have, one by one. You start from 1 and go up to however many cookies there are—in this case, 10. The loop does exactly that, going through each number step by step.

5. Create a list of 5 fruits and display the third one.

This exercise involves creating a list, which is an ordered collection of items. After creating the list with five fruits, you access the third item using its index (remember, Python uses zero-based indexing). Here's how you can do it:

fruits = ["apple", "banana", "cherry", "date", "elderberry"]
print(fruits[2])

In this case, 'cherry' is at index 2 and will be printed.

Think of the list of fruits like a fruit basket. If you want to pick the third fruit, you might count each fruit one by one until you reach the third. In programming, this counting is done using indexes.

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