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  1. using System;
  2. using System.Text;
  3. using System.Text.RegularExpressions;
  4. using System.Linq;
  5.  
  6. class Program
  7. {
  8.     static void Main()
  9.     {
  10.         string expr = "50*2+1";        
  11.         string[] num = Regex.Split(expr, @"\-|\+|\*|\/").Where(s => !String.IsNullOrEmpty(s)).ToArray(); // get Array for numbers
  12.         string[] op = Regex.Split(expr, @"\d{1,3}").Where(s => !String.IsNullOrEmpty(s)).ToArray(); // get Array for mathematical operators +,-,/,*
  13.         int numCtr = 0, lastVal=0; // number counter and last Value accumulator
  14.         string lastOp = ""; // last Operator
  15.         foreach (string n in num)
  16.         {
  17.             numCtr++;
  18.             if (numCtr == 1)
  19.             {
  20.                 lastVal = int.Parse(n); // if first loop lastVal will have the first numeric value
  21.             }
  22.             else
  23.             {
  24.                 if (!String.IsNullOrEmpty(lastOp)) // if last Operator not empty
  25.                 {
  26.                     // Do the mathematical computation and accumulation
  27.                     switch (lastOp) 
  28.                     {
  29.                         case "+":
  30.                             lastVal = lastVal + int.Parse(n);
  31.                             break;
  32.                         case "-":
  33.                             lastVal = lastVal - int.Parse(n);
  34.                             break;
  35.                         case "*":
  36.                             lastVal = lastVal * int.Parse(n);
  37.                             break;
  38.                         case "/":
  39.                             lastVal = lastVal + int.Parse(n);
  40.                             break;
  41.  
  42.                     }
  43.                 }
  44.             }
  45.             int opCtr = 0;
  46.             foreach (string o in op)
  47.             {
  48.                 opCtr++;
  49.                 if (opCtr == numCtr) //will make sure it will get the next operator
  50.                 {
  51.                     lastOp = o;  // get the last operator
  52.                     break;
  53.                 }
  54.             }
  55.         }
  56.         Console.WriteLine(lastVal.ToString());
  57.     }   
  58. }
Success #stdin #stdout 0.09s 34096KB
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https://ideone.com/DZgZGn
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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