5.6. Try It Yourself

1. Print all numbers from 1 to 10 using a for loop.

In this task, you're asked to use a for loop to print the numbers sequentially from 1 to 10. A for loop iterates over a sequence, and in this case, we will use the range() function to create that sequence. The range(1, 11) will generate numbers starting from 1 up to (but not including) 11, which gives us the numbers from 1 to 10. The basic structure will look like this:

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

Imagine you're counting your favorite toys. You want to show your friend how many you have, so you start from 1 and count up to 10 out loud, one by one. This is just like using a for loop to print numbers; you go through each number in order, like counting your toys.

2. Write a program to calculate the sum of first 10 natural numbers using a while loop.

In this exercise, you need to calculate the sum of the first ten natural numbers: 1, 2, 3, ..., up to 10. A while loop will be suitable for this. Start by initializing a counter variable to 1 and a sum variable to 0. Then, as long as the counter is less than or equal to 10, you will add the counter value to the sum and increment the counter by 1. The structure will look like this:

count = 1
sum = 0
while count <= 10:
    sum += count
    count += 1
print(sum)

Think about collecting stickers. You have 10 stickers, and you want to know how many you have in total as you collect them one by one. Each time you get a sticker, you add its number to your total count. The while loop helps you continue this process until you've counted all 10 stickers.

3. Print only even numbers from 1 to 20 using continue.

This task asks you to print only the even numbers from 1 to 20. You can use a for loop combined with the continue statement. In this loop, you will check if a number is odd. If it is, you will use continue to skip the current iteration and move to the next number. The structure will look like this:

for num in range(1, 21):
    if num % 2 != 0:
        continue
    print(num)

Imagine you're sorting a box of fruits and you only want to keep the apples while discarding the pears. As you take each fruit out of the box, if it’s a pear (an odd number of fruits), you ignore it and move on to the next one. This is similar to how the continue statement works – you skip over what you don't want and keep focusing on the even numbers.

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