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Challenges

Challenge 1.3

# Display Binary Numbers (using variables as an operator)

Challenge Level: Beginner

## Requirement:

Write a program to display numbers 1, 2, 4, 8 and 16 on the screen one at a time. This is similar to the previous challenge, but instead of storing a number directly into the variable, you should double the value in the variable each time. You need to use an operator (for multiplying 2 numbers) for this challenge.

Hints
• Make a variable called number_of_dots and set its value to 1.
• To multiply a number in Python, use the * symbol. For example: 2 * 3 is equal to 6.
• To double a variable's value, set the variable to be itself multiplied by 2. For example: If you have the variable age and it is set to 5, you can double the variable with age = age * 2.
• The print() statement allows you to display text or values within the parentheses on the screen. For example: print(100) would display 100 on the screen.
Programming Reminders
# Print a string directly
print("Hello World!")

# Print a variable
print(my_var)

#### Variables

# Set a variable as a string
fruit_name = "Apple"

# Set a variable as an integer
pieces_of_fruit = 7

# Set a variable from a calculation
cost_of_fruit = pieces_of_fruit * cost_per_item

# Add one to a value
pieces_of_fruit += 1

#### Conditionals

# Find out the discount on fruit
if pieces_of_fruit > 100:
print("Bulk discount applies")
elif pieces_of_fruit > 5:
print("Discount applies")
else:
print("No discount")

#### For loops

# Print numbers 0-9 - remember Python starts counting from 0
for num in range(10):
print(num)

#### While loops

# Print numbers 0-9 using a while loop and a variable
num = 0
while num < 10:
print(num)

# Increment the variable by one.
# It will prevent an infinite loop!
num += 1 

#### Lists

# Create a list of fruit
fruit = ["Apple", "Banana", "Orange", "Pear"]

#### Functions

# Create a function which prints a greeting
def greeting(name):
print("Hello " + name)

# Call the function
greeting("Spiderman")

Enter your code in the editor below

Your results will be displayed here

Input Expected output Received output Status

1
2
4
8
16

Not yet run ?