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