Print all Negative Numbers in a Range - Python
Last Updated : 01 Feb, 2025
We are given a range we need to print all negative number within specific range. For example, we are given start and end point start, end = -5, 0 we need to print all numbers so that output should be -5 -4 -3 -2 -1.
Using a loop
We can use a loop to iterate through a given range and check if each number is negative. If number is negative it gets printed inside loop.
Python start, end = -5, 0 for i in range(start, end + 1): if i < 0: # Check if the number is negative print(i)
Explanation:
- Loop iterates through the range from -5 to 0 (inclusive) checking each number to see if it is negative.
- If number is negative (i < 0), it gets printed.
Using list comprehension
We can use list comprehension to generate a list of negative numbers within the specified range by iterating through range and filtering values less than 0.
Python start, end = -10, 0 # List comprehension to generate a list of negative numbers within the range n = [i for i in range(start, end + 1) if i < 0] print(n)
Output[-10, -9, -8, -7, -6, -5, -4, -3, -2, -1]
Explanation: List comprehension iterates through the range from -10 to 0 and includes only numbers less than 0.
Using filter()
We can use filter() to apply a condition (i < 0) to range of numbers returning only negative numbers.
Python start, end = -10, 0 e # Use filter() to keep only negative numbers from range and convert result to a list n = list(filter(lambda x: x < 0, range(start, end + 1))) print(n)
Output[-10, -9, -8, -7, -6, -5, -4, -3, -2, -1]
Explanation: filter() function applies a lambda function (lambda x: x < 0) to each element in the range from -10 to 0, keeping only negative numbers.
Using map()
We can use map() to iterate over the range and apply a lambda function that checks if each number is negative then filter out non-negative values.
Python start, end = -10, 0 n = list(map(lambda x: x if x < 0 else None, range(start, end + 1))) # Use list comprehension to remove None values (non-negative numbers) n = [num for num in n if num is not None] print(n)
Output[-10, -9, -8, -7, -6, -5, -4, -3, -2, -1]
Explanation:
- The map() function applies a lambda that returns the number if it's negative, otherwise it returns None, resulting in a list where non-negative numbers are replaced by None.
- A list comprehension filters out the None values, leaving only the negative numbers.
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