csharp 功能齐全的计算器用C＃编写，紧凑和格式化

Posted 2021-05-12

using System;

namespace PA05Local
{
    class Calculator
    {
        static void Main()
        {
            //Declarations
            string sign;
            int numberOne;
            int numberTwo;
            int answer;
            sign = GetSign();
            numberOne = GetNumberOne();
            numberTwo = GetNumberTwo();
            answer = PerformCalculation(numberOne, numberTwo, sign);
            DisplayAnswer(sign, numberOne, numberTwo, answer);
            TerminateProgram();

        }

        private static int PerformCalculation(int numberOne, int numberTwo, string sign)
        {
            if (sign == "+")
            {
                return numberOne + numberTwo;
            }
            else if (sign == "-")
            {
                return numberOne - numberTwo;
            }
            else if (sign == "*")
            {
                return numberOne * numberTwo;
            }
            else if (sign == "/")
            {
                return numberOne / numberTwo;
            }
            else
            {
                Console.WriteLine("****INVALID OPERATOR -1 RETURNED****");
                return -1;
            }
        }


        private static string GetSign()
        {
            string sign;
            Console.WriteLine("Please enter an operator: <+, -, *, />");
            sign = Console.ReadLine();
            return sign;
        }

        private static int GetNumberOne()
        {
            int numberOne;
            Console.WriteLine("Please enter the first number");
            numberOne = Convert.ToInt16(Console.ReadLine());
            return numberOne;
        }

        private static int GetNumberTwo()
        {
            int numberTwo;
            Console.WriteLine("Please enter the second number");
            numberTwo = Convert.ToInt16(Console.ReadLine());
            return numberTwo;
        }

        private static void DisplayAnswer(string sign, int numberOne, int numberTwo, int answer)
        {
            Console.WriteLine("{0} {1} {2} = {3}", numberOne, sign, numberTwo, answer);
        }

        private static void TerminateProgram()
        {
            Console.WriteLine("When you are finished, press the <ENTER> key to close the window");
            Console.ReadLine();
        }
    }
}