W8 APP8
Mylib.py
#class for doing simple arithmetic, #and calculating expressions. class Calculator(): #constructor #input are the numbers to be operated on def __init__(self, n1, n2): self.n1 = n1 self.n2 = n2 #return a dictionary of all arithmetic operations def allInOne(self): return {"add":self.plus(), "sub":self.subtract(), "mult":self.multiply(), "div": self.divide()} #check a value is within the given range lr..hr #helper procedure @staticmethod def IsInRange(lr, hr, n): return lr < n and n < hr #add 2 numbers def plus(self): add = self.n1 + self.n2 return add #subtract 2 numbers def subtract(self): sub = self.n1 - self.n2 return sub #multiply 2 numbers def multiply(self): mult = self.n1 * self.n2 return mult #division, n2 should not be zero def divide(self): try: div = self.n1/(self.n2 + 0.0) return div except ZeroDivisionError as e: print("The result of %s/%s = %s" % \ (self.n1, self.n2,"You cannot divide by Zero")) except Exception : print("Invalid input" , self.n1, self.n2) #expression calculator #will create the calculator object @staticmethod def scalc(val): try: #the epression is assumed to be comma separated ns = val.split(",") #split it into 3 parts #remove whitespaces in the components n1 = int(ns[0].strip()) n2 = int(ns[1].strip()) op = ns[2].strip() calc = Calculator(n1, n2) #create a calculator for doing arithmetic #better option than mutating self. #check if operator is one of the supported if op == "*": return calc.multiply() elif op == "/": return calc.divide() elif op == "+": return calc.plus() elif op == "-": return calc.subtract() else: print("Unknown operator", op) #in case of invalid input catch the error except Exception : print("Invalid input:" , val)
W7_first_last.py
# Program name : # Student Name : # Course : ENTD220 # Instructor : # Date : 02/20/2020 # Description : Expression & Arithmetic Calculator using classes # Copy Wrong : This is my work from Mylib import Calculator def doScalc(): print("---------Expression calculator------------------") print("Enter the expression with format N1,N2,operator:") print("Supported operator * , /, -, +") print("E.g 5, 4, *)") val = input() res = Calculator.scalc(val) print('The result of "' + val + '" is', res) def showList(): print("1) Add two numbers") print("2) Multiply two numbers") print("3) Subtract two numbers") print("4) Divide two numbers") print("5) Scalc") print("6) All in one") print("7) Exit") def getUserInput(): low = int(input("Enter Lower range:")) high = int(input("Enter Higher range:")) n1 = int(input("Enter first number:")) n2 = int(input("Enter second number:")) return [low, high, n1 , n2] def doCalculation(op): user = getUserInput() low = user[0] high = user[1] n1 = user[2] n2 = user[3] if Calculator.IsInRange(low , high, n1) and \ Calculator.IsInRange(low , high, n2): calc = Calculator(n1, n2) if op == "+": res = calc.plus() elif op == "*": res = calc.multiply() elif op == "-": res = calc.subtract() elif op == "/": res = calc.divide() print("%d %s %d = %d" % (n1, op, n2, res)) else: print("Error: input out of range") def doAllInOne(): user = getUserInput() low = user[0] high = user[1] n1 = user[2] n2 = user[3] if Calculator.IsInRange(low , high, n1) and \ Calculator.IsInRange(low , high, n2): calc = Calculator(n1, n2) mydict = calc.allInOne() print("%d + %d = %d" % (n1, n2, mydict["add"])) print("%d - %d = %d" % (n1, n2, mydict["sub"])) print("%d * %d = %d" % (n1, n2, mydict["mult"])) print("%d / %d = %d" % (n1, n2, mydict["div"])) def main(): while True: showList() action = int(input("What do you want to do?")) if action == 7: break; if action == 1: user = getUserInput doCalculation("+") elif action == 2: doCalculation("*") elif action == 3: doCalculation("-") elif action == 4: doCalculation("/") elif action == 5: doScalc() elif action == 6: doAllInOne() print() main() print("Thanks for using our calculator!")