(Convert milliseconds to hours, minutes, and seconds)

Question

Write a function that converts milliseconds to hours, minutes, and seconds using the following header: def convertMillis(millis): The function returns a string as hours:minutes:seconds. For example, convertMillis(5500) returns the string 0:0:5, convertMillis(100000) returns the string 0:1:40, and convertMillis(555550000) returns the string 154:19:10. Write a test program that prompts the user to enter a value for milliseconds and displays a string in the format of hours:minutes:seconds.

Answer 1

Hello Richard! Please see below for a sample Python program that converts milliseconds to seconds, minutes and hours. Code comments (preceded with a hash #) explain what each section does.

def convertMillis(millis):

# There are 1000 milliseconds in 1 second

# We use % 60 to get the portion of seconds that don't make a whole minute

# It is % 60 because there are 60 seconds in 1 minute

seconds = int(millis / 1000) % 60

# There are 60 seconds in 1 minute

# We use % 60 to get the portion of minutes that don't make a whole hour

# It is % 60 because there are 60 minutes in 1 hour

minutes = int(millis / (1000 * 60)) % 60

# There are 60 minutes (or 3600 seconds) in 1 hour

# We do not do any modulo operation here because we interested in all hours

# We do not calculate the number of whole days

hours = int(millis / (1000 * 60 * 60))

# Interpolate the hours, minutes and seconds variables into a single string

# This uses string formatting which is why it is preceded with f'

return f'{hours}:{minutes}:{seconds}'

# Get input from the user's keyboard

user_value = input("Enter a number of milliseconds: ")

# Check the user supplied a number only

if user_value.isdigit():

print("Converted to", convertMillis(int(user_value)))

else:

print("ERROR: Please enter a number only.")