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Challenges

Challenge 8.2

# Binary representation of any decimal number by playing musical notes

Challenge Level: Ready to expand

## Requirement:

Write a program that asks the user to enter any decimal number as the input and plays the musical notes representing that number in binary (high notes for dots showing and low notes for dots not showing).

Hints
• Make variables called:

• decimal_number and set its value to the input number given by the end user.
• bit_value and set its value to 1. Find the smallest bit value which is larger than decimal_number by doubling value of bit_value until it is bigger than the decimal_number (by using a while loop while bit_value is less than or equal to decimal_number).
• Set the variable bit_value to 1 and find the smallest bit_value which is larger than decimal_number by multiplying bit_value by 2 until it is larger than decimal number. You can do this by using a while loop.

• Now divide the bit_value by 2 and check if decimal_number is greater than or equal to bit_value. If it is, print "high" for a high note and subtract bit_value from decimal_number. If not, print "low" for a low note. Repeat until bit_value is equal to 1 (by using a while loop while bit_value is greater than 1)

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
255
high
high
high
high
high
high
high
high

Not yet run ?
100
high
high
low
low
high
low
low

Not yet run ?
1
high

Not yet run ?