public void AddHistory(CurrentOperation item)
{
string historyItem = item.fNumber + " " + item.operation + " " + item.sNumber + " = " + item.result;
sb.AppendLine(historyItem);
using (var streamWriter = File.CreateText(pathToFile))
{
streamWriter.Write(sb.ToString());
}
}
public void ReadExpression()
{
double fNumber = 0, sNumber = 0;
string symbol = "";
string line = Console.ReadLine();
if (line.Equals("EXIT"))
{
System.Environment.Exit(-1);
}
string[] items;
items = line.Split(' ');
try
{
if (items.Length != 3)
{
throw new System.FormatException();
}
fNumber = Convert.ToDouble(items[0]);
sNumber = Convert.ToDouble(items[2]);
symbol = Convert.ToString(items[1]);
if (!symbol.Equals("+") && !symbol.Equals("-") && !symbol.Equals("*") && !symbol.Equals("/"))
{
throw new System.FormatException();
}
}
catch (System.FormatException)
{
Console.Beep();
Console.WriteLine("Invalid expression");
System.Environment.Exit(-1);
}
operation = new CurrentOperation(fNumber, sNumber, symbol);
Reprint();
}
