static void Main(string[] args)
{
printMessage("Welcome to Fractionator!\nI will help you perform basic operations (+, -, *, /) with fractional numbers");
printMessage("Example: ? 1/7 + 3_8/16");
while (true)
{
string input = Console.ReadLine();
if (input.ToLower().Trim().Equals("exit"))
{
break;
}
if (input[0].Equals('?'))
{
FractionNumber f1, f2;
string oper;
if (FractionExpression.tryParse(input.Trim('?'), out f1, out f2, out oper))
{
Console.WriteLine("Result: " + FractionExpression.executeOperation(f1, f2, oper));
}
else
{
printMessage("Invalid expression!");
}
}
else
{
printMessage("Wrong input!");
}
}
}
public static bool tryParse(string expr, out FractionNumber f1, out FractionNumber f2, out string oper)
{
f1 = new FractionNumber(0);
f2 = new FractionNumber(0);
oper = "";
string[] pieces = expr.Split(' ');
List <string> expPieces = new List <string>();
for (int p = 0; p < pieces.Length; p++)
{
if (pieces[p].Trim().Length > 0)
{
expPieces.Add(pieces[p]);
if (expPieces.Count == 3)
{
break;
}
}
}
// Min set for operation
if (expPieces.Count < 3)
{
return(false);
}
// Valid oper sign
List <string> operands = new List <string> {
"+", "-", "*", "/"
};
if (expPieces[1].Length != 1 || !operands.Contains(expPieces[1]))
{
return(false);
}
oper = expPieces[1];
// Parse each fraction number
if (!FractionExpression.tryParse(expPieces[0], out f1) ||
!FractionExpression.tryParse(expPieces[2], out f2))
{
return(false);
}
return(true);
}