Problem
Solution
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Find the Last Digit of a Number
Certification: Basic Level
Accuracy: 74.84%
Submissions: 159
Points: 5
Write a Python program that finds the last digit of a given integer.
Example 1
- Input: 12345
- Output: 5
- Explanation:
- Step 1: Take the input number 12345.
- Step 2: Calculate 12345 % 10 = 5 to get the last digit.
- Step 3: Return 5 as the result.
Example 2
- Input: -6789
- Output: 9
- Explanation:
- Step 1: Take the input number -6789.
- Step 2: Calculate abs(-6789) = 6789 to get the absolute value.
- Step 3: Calculate 6789 % 10 = 9 to get the last digit.
- Step 4: Return 9 as the result.
Constraints
- -10^9 ≤ number ≤ 10^9
- For negative numbers, return the absolute value of the last digit
- Time Complexity: O(1)
- Space Complexity: O(1)
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Solution Hints
- Use modulo operator: abs(number) % 10
- Convert to string and get last character: int(str(abs(number))[-1])
- Use math.fmod() for floating point numbers: int(abs(math.fmod(number, 10)))
- Create a function: def last_digit(num): return abs(num) % 10