76 lines
2.0 KiB
C#
76 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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namespace calculator
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{
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class Program
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{
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static void Main(string[] args)
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{
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if (args.Length == 0)
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Console.WriteLine("REPL is not ready yet. Please, provide mathematic expression as an argument");
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else
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try
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{
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string[] expr = args[0].Split();
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Stack<double> st = new Stack<double>();
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for (int i = 0; i < expr.Length; i++)
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{
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object val = convertOne(expr[i]);
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if (val is double number)
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st.Push(number);
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else if (val is char oper)
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{
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try
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{
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double b = st.Pop();
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double a = st.Pop();
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switch (oper)
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{
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case '+':
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st.Push(a + b);
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break;
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case '-':
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st.Push(a - b);
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break;
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case '*':
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st.Push(a * b);
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break;
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case '/':
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st.Push(a / b);
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break;
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case '^':
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st.Push(Math.Pow(a, b));
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break;
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default:
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throw new Exception("Got unknown operator");
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}
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}
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catch (InvalidOperationException)
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{
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throw new Exception(oper + " operation requires two operands");
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}
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}
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else throw new Exception("Stack corrupted");
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}
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Console.WriteLine(st.Pop());
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}
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catch (Exception e)
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{
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Console.WriteLine(e.Message);
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}
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}
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static private object convertOne(string s)
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{
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double res;
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if (Double.TryParse(s, out res)) return res;
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else if (s.Length == 1) return s[0];
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else throw new Exception("Got multiple characters operator");
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}
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}
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}
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