public override DataType staticTypeCheck() { DataType leftType = LeftOperand.staticTypeCheck(); DataType rightType = RightOperand.staticTypeCheck(); if (leftType == DataType.StringType && rightType == DataType.StringType) { return(DataType.StringType); } else if (leftType == DataType.FloatType || rightType == DataType.FloatType) { return(DataType.FloatType); } else if (leftType == DataType.IntegerType && rightType == DataType.IntegerType) { return(DataType.IntegerType); } Log.Error("Type mismatch", Filename, Line, Position); return(DataType.NoneType); }