6. heti házi

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
namespace PMPHF005_P99J7Y
{
    internal class PMPHF005_P99J7Y
    {
        static int GetOperandValue(string operand, int[] registers)
        {
            if (Char.IsLetter(operand[0]))
            {
                return registers[operand[0] - 'A'];
            }
            else
            {
                return int.Parse(operand);
            }
        }
        static void Main(string[] args)
        {
            int[] registers = new int[4];

            string[] lines = File.ReadAllLines("input.txt");
            string[] initialRegisters = lines[0].Split(',');

            for (int i = 0; i < 4; i++)
            {
                registers[i] = int.Parse(initialRegisters[i]);
            }

            int currentLine = 1;

            while (currentLine < lines.Length)
            {
                string line = lines[currentLine];
                string[] parts = line.Split(' ');

                string command = parts[0];

                if (command == "MOV")
                {
                    char destReg = parts[1][0];
                    string src = parts[2];

                    int value = GetOperandValue(src, registers);

                    registers[destReg - 'A'] = value;
                }
                else if (command == "ADD")
                {
                    char destReg = parts[1][0];
                    string src1 = parts[2];
                    string src2 = parts[3];

                    int value1 = GetOperandValue(src1, registers);
                    int value2 = GetOperandValue(src2, registers);

                    registers[destReg - 'A'] = value1 + value2;
                }
                else if (command == "SUB")
                {
                    char destReg = parts[1][0];
                    string src1 = parts[2];
                    string src2 = parts[3];

                    int value1 = GetOperandValue(src1, registers);
                    int value2 = GetOperandValue(src2, registers);

                    registers[destReg - 'A'] = value1 - value2;
                }
                else if (command == "JNE")
                {
                    int jumpLine = int.Parse(parts[1]);
                    char srcReg1 = parts[2][0];
                    string srcReg2 = parts[3];

                    int value1 = registers[srcReg1 - 'A'];
                    int value2 = GetOperandValue(srcReg2, registers);

                    if (value1 != value2)
                    {
                        currentLine = jumpLine;
                    }
                }

                currentLine++;
            }

            string output = string.Join(",", registers);
            File.WriteAllText("output.txt", output);
        }
    }
}