Python Exercises: Check a number is a repdigit number or not

Last update on April 24 2025 12:44:04 (UTC/GMT +8 hours)

89. Repdigit Checker

From Wikipedia,
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system. The word is a portmanteau of repeated and digit. Examples are 11, 666, 4444, and 999999.

Write a Python program to check if a given number is a repdigit number or not. If the given number is repdigit return true otherwise false.

Sample Data:
(0) -> True
(1) -> True
(-1111) -> False
(9999999) -> True

Sample Solution-1:

Python Code:

def test(n):
    if n < 0: return False
    if n == 0: return True
    return len(set(str(n))) == 1
n = 0
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = -1111
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = 1
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = 9999999
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n)) 

Sample Output:

Original number: 0
Check the said number is a repdigit number or not!
True
Original number: -1111
Check the said number is a repdigit number or not!
False
Original number: 1
Check the said number is a repdigit number or not!
True
Original number: 9999999
Check the said number is a repdigit number or not!
True

Flowchart:

Sample Solution-2:

Python Code:

def test(n):
	a = str(n).count(str(n)[0])
	b = len(str(n))
	return a == b

n = 0
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = -1111
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = 1
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))
n = 9999999
print("Original number:", n)
print("Check the said number is a repdigit number or not!")
print(test(n))

Sample Output:

Original number: 0
Check the said number is a repdigit number or not!
True
Original number: -1111
Check the said number is a repdigit number or not!
False
Original number: 1
Check the said number is a repdigit number or not!
True
Original number: 9999999
Check the said number is a repdigit number or not!
True

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to determine if a given integer is a repdigit by checking if all its digits are identical, returning True or False.
• Write a Python function that verifies if a number is a repdigit, handling special cases such as 0 and negative numbers.
• Write a Python script to test several numbers for repdigit status and then print each number with its check result.
• Write a Python program to prompt the user for an integer and print whether it is a repdigit number, with proper error handling.

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