using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        String testInput1 = "3+40+5+7+2-23";

        //String testInput2 = "3.4/40-5+7.2*2";

        //string operation = Console.ReadLine();

        double no1 = 0;

        char[] operators = {'+','-','*','/'};

​

        int index = 0;

        string op = null;

        do {

            int stariIndex = index;

            index = testInput1.IndexOfAny(operators, index);

            if(index != -1) {

                string broj1 = testInput1.Substring(stariIndex, index - stariIndex);

                op = testInput1.Substring(index,1);

                Console.WriteLine("Operator " + op + " at index " + index);

​

                //no1 = no1 + double.Parse(broj1);

                try {

                no1 = izracunaj(no1, double.Parse(broj1), Convert.ToChar(op));

                double x = izracunaj(no1, double.Parse(broj1), Convert.ToChar(op));

                Console.WriteLine("Broj no1 je " + no1 + " no2 je " + double.Parse(broj1));

                }

                catch (Exception e){

                   Console.WriteLine("Invalid user input " + broj1 + " nije validan broj \n Provjerite vas input i pokusajte ponovo" );

                    return;

                }

​

                index++;    

            }

            else {

                if (op != null)

                {

                string broj1 = testInput1.Substring(stariIndex, testInput1.Length - stariIndex);

                no1 = izracunaj(no1, double.Parse(broj1), Convert.ToChar(op));  

                Console.WriteLine("Broj no1 je " + no1 + " no2 je " + double.Parse(broj1));

                }

            }

        } while(index >= 0);

​

        //if (operation == "+" && operation == "-" || operation == "*" || operation == "/" )

        return;

​

    }

    static double izracunaj(double no1, double no2, char operation) {

        double result = 0;

​

            switch(operation)

            {

            case '+':

                result = no1 + no2;

                break;

            case  '-':

                result = no1 - no2;

                break;

            case '*':

                result = no1 * no2;

                break;

            case '/':

                result = no1 / no2;

                break;

            default:

                    Console.WriteLine("Error invalid Operator");

                    Console.WriteLine("Try Agin ");

                break;

            }

            Console.WriteLine("Result is:" + result); 

        return result;

​

    }

}