How can I add DMAS rule in my calculator code using C#

Question

1.00/5 (1 vote)

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C#

<pre>using System;
using System.Collections.Generic;

class Calculator
{
    public string FirstNumber = "0";
    public string SecondNumber = "0";
    public int IntFirstNumber;
    public int IntSecondNumber;
    public string Operator = "";
    public string OperatorType = "";
    public bool isOperator = false;
    public string ShowNumber = "";
    public string UserInput = "";
    public int Result;
    public double Calculate()
    {
        string Plus = "+";
        string Subtract = "-";
        string Multiply = "*";
        string Devide = "/";

        while (0 < 1)
        {
            Console.WriteLine("Enter any Value or Operator");
            string UserInput = Console.ReadLine();
            ShowNumber = ShowNumber + UserInput;
            List<string> TotalInfo = new List<string>();

            TotalInfo.Add(ShowNumber);
            foreach (var item in TotalInfo)
            {

                if (FirstNumber == "0")
                {
                    FirstNumber = UserInput;
                    IntFirstNumber = int.Parse(FirstNumber);
                }
                else if (UserInput == "+" || UserInput == "-" || UserInput == "*" || UserInput == "/")
                {
                    OperatorType = UserInput;
                    if (Operator == Plus)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Subtract)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Multiply)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Devide)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                }
                else if (UserInput == "=")
                    break;

                else
                {
                    SecondNumber = UserInput;

                    IntSecondNumber = int.Parse(SecondNumber);
                }

            }
            if (UserInput == "=")
            {
                if (OperatorType == "+")
                {
                    Result = IntFirstNumber + IntSecondNumber;
                }
                else if (OperatorType == "*")
                {
                    Result = IntFirstNumber * IntSecondNumber;
                }
                else if (OperatorType == "-")
                {
                    Result = IntFirstNumber - IntSecondNumber;
                }
                else if (OperatorType == "/")
                {
                    Result = IntFirstNumber / IntSecondNumber;

                }

                {
                    Console.WriteLine(Result);
                    Console.ReadLine();
                    IntFirstNumber = Result;
                }

            }
        }
    }
}
class Program
{
    static void Main(string[] args)
    {
        Calculator obj = new Calculator();
        obj.Calculate();
    }
}

What I have tried:

C#

<pre>using System;
using System.Collections.Generic;

class Calculator
{
    public string FirstNumber = "0";
    public string SecondNumber = "0";
    public int IntFirstNumber;
    public int IntSecondNumber;
    public string Operator = "";
    public string OperatorType = "";
    public bool isOperator = false;
    public string ShowNumber = "";
    public string UserInput = "";
    public int Result;
    public double Calculate()
    {
        string Plus = "+";
        string Subtract = "-";
        string Multiply = "*";
        string Devide = "/";

        while (0 < 1)
        {
            Console.WriteLine("Enter any Value or Operator");
            string UserInput = Console.ReadLine();
            ShowNumber = ShowNumber + UserInput;
            List<string> TotalInfo = new List<string>();

            TotalInfo.Add(ShowNumber);
            foreach (var item in TotalInfo)
            {

                if (FirstNumber == "0")
                {
                    FirstNumber = UserInput;
                    IntFirstNumber = int.Parse(FirstNumber);
                }
                else if (UserInput == "+" || UserInput == "-" || UserInput == "*" || UserInput == "/")
                {
                    OperatorType = UserInput;
                    if (Operator == Plus)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Subtract)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Multiply)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                    else if (UserInput == Devide)
                    {
                        OperatorType = UserInput;
                        isOperator = true;
                    }
                }
                else if (UserInput == "=")
                    break;

                else
                {
                    SecondNumber = UserInput;

                    IntSecondNumber = int.Parse(SecondNumber);
                }

            }
            if (UserInput == "=")
            {
                if (OperatorType == "+")
                {
                    Result = IntFirstNumber + IntSecondNumber;
                }
                else if (OperatorType == "*")
                {
                    Result = IntFirstNumber * IntSecondNumber;
                }
                else if (OperatorType == "-")
                {
                    Result = IntFirstNumber - IntSecondNumber;
                }
                else if (OperatorType == "/")
                {
                    Result = IntFirstNumber / IntSecondNumber;

                }

                {
                    Console.WriteLine(Result);
                    Console.ReadLine();
                    IntFirstNumber = Result;
                }

            }
        }
    }
}
class Program
{
    static void Main(string[] args)
    {
        Calculator obj = new Calculator();
        obj.Calculate();
    }
}

Posted 14-Apr-21 19:03pm

shahzaib malik

Updated 14-Apr-21 23:03pm

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CPallini · Accepted Answer · 2021-04-14T20:21:00

Solution 1

It is not a straightforward task, since you need a bit of parsing. Have a look at Shunting-yard algorithm - Wikipedia[^].

Posted 14-Apr-21 20:21pm

CPallini

BillWoodruff · Accepted Answer · 2021-04-14T23:03:00

with infix, or postfix, notation: without some form of delimiter, like (), to mark expression boundaries, you can not implement recursive operator precedence handling/parsing.

how would you parse this ?
1 + 5 * 10 / 4 - 23 * 4 / 5

compare to this:
(((1 + 5) * 10 / 4) - 23 * 4) / 5

fortunately for you :), a zillion other programmers have had to implement this: [^]