static void Main(string[] args)
{
// Expression expr = new BinaryOperation(
// new Value(15),
// new BinaryOperation(new Value(3), new Value(9), multiplication),
// addittion
// );
BinaryExpressionBuilder rightExprBuilder = new BinaryExpressionBuilder();
rightExprBuilder.Left = new Value(3);
rightExprBuilder.Operation = multiplication;
rightExprBuilder.Right = new Value(9);
Expression rightExpr = rightExprBuilder.Get();
BinaryExpressionBuilder exprBuilder = new BinaryExpressionBuilder();
exprBuilder.Left = new Value(15);
exprBuilder.Operation = addition;
exprBuilder.Right = rightExpr;
Expression expr = exprBuilder.Get();
Console.WriteLine(expr.GetValue());
Console.WriteLine("Enter an expression:");
Console.WriteLine(ParseExpression(Console.In).GetValue());
}
static void Main(string[] args)
{
ArrayBuilder <int> builder = new ArrayBuilder <int>();
for (int i = 0; i < 20; i += 1)
{
builder.Add(i * 10);
}
int[] array = builder.Get();
Console.WriteLine(String.Join(", ", array));
// Expression expr = new Addition(
// new Value(15),
// new Multiplication(new Value(3), new Value(9))
// );
BinaryExpressionBuilder rightExprBuilder = new BinaryExpressionBuilder();
rightExprBuilder.Left = new Value(3);
rightExprBuilder.Operation = BinaryExpressionBuilder.Operations.Multiplication;
rightExprBuilder.Right = new Value(9);
Expression rightExpr = rightExprBuilder.Get();
BinaryExpressionBuilder exprBuilder = new BinaryExpressionBuilder();
exprBuilder.Left = new Value(15);
exprBuilder.Operation = BinaryExpressionBuilder.Operations.Addition;
exprBuilder.Right = rightExpr;
Expression expr = exprBuilder.Get();
Console.WriteLine(expr.GetValue());
}
static Expression ParseExpression(TextReader reader)
{
SkipWhitespace(reader);
int next = reader.Peek();
if (next != '(')
{
StringBuilder stringBuilder = new StringBuilder();
if (next == '-')
{
stringBuilder.Append((char)reader.Read());
next = reader.Peek();
}
while (next != -1 && char.IsDigit((char)next))
{
stringBuilder.Append((char)reader.Read());
next = reader.Peek();
}
return(new Value(int.Parse(stringBuilder.ToString())));
}
reader.Read();
BinaryExpressionBuilder builder = new BinaryExpressionBuilder();
builder.Left = ParseExpression(reader);
SkipWhitespace(reader);
switch (reader.Read())
{
case '+':
builder.Operation = addition;
break;
case '-':
builder.Operation = subtraction;
break;
case '*':
builder.Operation = multiplication;
break;
case '/':
builder.Operation = division;
break;
default:
throw new Exception("Invalid operation");
}
builder.Right = ParseExpression(reader);
SkipWhitespace(reader);
if (reader.Read() != ')')
{
throw new Exception("Parentheses do not match");
}
return(builder.Get());
}
