77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
# Lesson 3 Task 1: calculator with functions
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# Author: Stanislav Mykhailenko
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# License: Unlicense
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# Return codes:
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# 0 - OK
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# 1 - Invalid numbers entered
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# 2 - Division by zero
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# 3 - Attempting to use a root with non-natural degree
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# 4 - Attempting to extract a root of a negative number with an even degree
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# 5 - Invalid operation entered
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import sys
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def add (firstNumber, secondNumber): return firstNumber + secondNumber
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def substract(firstNumber, secondNumber): return firstNumber - secondNumber
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def multiply(firstNumber, secondNumber): return firstNumber * secondNumber
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def divide(firstNumber, secondNumber):
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if secondNumber == 0:
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print("Division by zero.")
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sys.exit(2)
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else:
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return firstNumber / secondNumber
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def square(number): return number**2
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def isNatural(number): return False if number < 1 or not number.is_integer() else True
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def isEven(number): return True if (number % 2) == 0 else False
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def isNegative(number): return True if number < 0 else False
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def root(number, degree):
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if not isNatural(degree):
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print("Can't extract a root with non-natural degree.")
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sys.exit(3)
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elif isEven(degree) and isNegative(number):
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print("Can't extract a root of a negative number with an even degree.")
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sys.exit(4)
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else:
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if number < 0:
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return -abs(number ** (1 / degree))
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else:
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return number ** (1 / degree)
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try:
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firstNumber = float(input("Enter the first number: "))
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secondNumber = float(input("Enter the second number: "))
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except ValueError:
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print("Invalid numbers entered.")
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sys.exit(1)
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print(
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'''
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Valid operations:
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Addition: +
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Subtraction: - or −
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Multiplication: * or ×
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Division: / or ÷
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Root: root or √ (extracted from the first number, with the second number being its degree)
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Square: square or ² (of both numbers)''', end="\n\n"
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)
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operation = input("Enter operation: ")
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if operation == "+":
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print(add(firstNumber, secondNumber))
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elif operation == "-" or operation == "−": # ASCII hyphen-minus or Unicode minus
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print(substract(firstNumber, secondNumber))
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elif operation == "*" or operation == "×": # ASCII asterisk or Unicode multiplication sign
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print(multiply(firstNumber, secondNumber))
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elif operation == "/" or operation == "÷": # ASCII slash or Unicode division sign
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print(divide(firstNumber, secondNumber))
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elif operation == "root" or operation == "√": # Unicode radical symbol
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print(root(firstNumber, secondNumber))
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elif operation == "square" or operation == "²": # Unicode superscript 2
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print("Number A square: " + str(square(firstNumber)) + "\nNumber B square: " + str(square(secondNumber)))
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else:
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print("Invalid operation.")
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sys.exit(5)
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