Self-Descriptive Numbers Program
Self-Descriptive Numbers Program
Coding Project in Python
Write a Python program that asks the user to enter a number and checks whether the number is self-descriptive.
Considering the digit positions are labeled 0 to N-1, it is a self-descriptive number if the digit in each position is equal to the number of times that digit appears in the number.
For example: 2020 is a self-descriptive number beacause:
- Position 0 is 2 and there are two 0’s in the number
- Position 1 is 0 and 1 doesn´t appear.
- Position 2 is 2 and 2 appears twice in the number.
- Position 3 is 0 and there are no 3 0’s
Steps
- Input:
- Ask the user to enter a number.
- Check Self-Descriptiveness:
- Loop over each digit in the number and count the occurrences of that digit.
- Verify Self-Descriptiveness:
- Compare the count of each digit with the digit itself to verify if the number is self-descriptive.
Solution
def is_self_descriptive(number):
num_str = str(number)
length = len(num_str)
for i in range(length):
count = num_str.count(str(i))
if count != int(num_str[i]):
return False
return True
# Step 1: Take Input
user_number = input("Enter a number: ")
try:
user_number = int(user_number)
# Step 2 & 3: Check Self-Descriptiveness and Verify Self-Descriptiveness
if is_self_descriptive(user_number):
print(f"The number {user_number} is self-descriptive")
else:
print(f"The number {user_number} is not self-descriptive")
except ValueError:
print("Please enter a valid number")
Previous
