Triangle-classification

""" Triangle Classification Module This module provides functionality to classify triangles based on their side lengths. """

def classify_triangle(a, b, c): """ Classify a triangle based on side lengths a, b, c.

Args:
    a, b, c (float or int): The lengths of the triangle sides
    
Returns:
    str: Classification of the triangle ('equilateral', 'isosceles', 'scalene')
        with 'right' added if it's a right triangle
"""
# Input validation
if not (isinstance(a, (int, float)) and isinstance(b, (int, float)) and isinstance(c, (int, float))):
    return 'invalid input'

# Check for positive values
if a <= 0 or b <= 0 or c <= 0:
    return 'invalid input'

# Sort sides to simplify comparisons
sides = sorted([a, b, c])
a, b, c = sides[0], sides[1], sides[2]

# Check triangle inequality theorem
if a + b <= c:
    return 'not a triangle'

# Check for right triangle (using Pythagorean theorem with small epsilon for float comparison)
is_right = abs(a*a + b*b - c*c) < 0.001

# Classify based on side lengths
if abs(a - b) < 0.001 and abs(b - c) < 0.001:
    return 'equilateral' + (' right' if is_right else '')
elif abs(a - b) < 0.001 or abs(b - c) < 0.001 or abs(a - c) < 0.001:
    return 'isosceles' + (' right' if is_right else '')
else:
    return 'scalene' + (' right' if is_right else '')

if name == 'main': # Interactive testing print("Triangle Classification Program") print("Enter the lengths of three sides to classify a triangle.") print("Enter 'quit' to exit.")

while True:
    try:
        input_str = input("\nEnter three side lengths (separated by spaces): ")
        if input_str.lower() == 'quit':
            break
            
        sides = [float(x) for x in input_str.split()]
        if len(sides) != 3:
            print("Please enter exactly three numbers.")
            continue
            
        result = classify_triangle(sides[0], sides[1], sides[2])
        print(f"Classification: {result}")
        
    except ValueError:
        print("Invalid input. Please enter numeric values.")
    except Exception as e:
        print(f"An error occurred: {str(e)}")