修改 README.md ，整理代码

Author: toolgood

README.md

@@ -18,11 +18,10 @@ ToolGood.Algorithm֧
 ```
 支持常量`pi`,`e`,`true`,`false`。
 
-数字转bool，非零为真
+数字转bool，非零为真,零为假。bool转数字，假为0，真为1。
 
 索引默认为`Excel索引`，如果想用c#索引，请设置`UseExcelIndex`为`false`。
 
-
 ## 自定义参数
 ``` csharp
     //定义圆柱信息
@@ -55,7 +54,10 @@ ToolGood.Algorithm֧
     c.TryEvaluate("[半径]*[半径]*pi()", 0.0);      //圆底面积
     c.TryEvaluate("[直径]*pi()", 0.0);            //圆的长
     c.TryEvaluate("[半径]*[半径]*pi()*[高]", 0.0); //圆的体积
+
+	c.TryEvaluate("p('半径')*[半径]*pi()*[高]", 0.0); //圆的体积
 ```
+参数以方括号定义，如 `[参数名]`。变量参数可以用`p(参数名)`。
 
 
 ## Excel函数

ToolGood.Algorithm/_base/Date.cs

@@ -5,7 +5,7 @@
 
 namespace ToolGood.Algorithm
 {
-     class Date
+    class Date
     {
         public Date(string str)
         {
@@ -98,11 +98,11 @@ public override string ToString()
                     ((DateTime)this).ToString("yyyy-MM-dd HH:mm:ss");
                 } else if (Year > 0 && Hour > 0) {
                     ((DateTime)this).ToString("yyyy-MM-dd HH:mm");
-                } else if (Year > 0 ) {
+                } else if (Year > 0) {
                     ((DateTime)this).ToString("yyyy-MM-dd");
                 } else if (Hour > 0 && Second > 0) {
                     ((DateTime)this).ToString("HH:mm:ss");
-                } else  {
+                } else {
                     ((DateTime)this).ToString("HH:mm:ss");
                 }
             }
@@ -125,7 +125,7 @@ public static implicit operator DateTime(Date date)
         }
         public static implicit operator TimeSpan(Date date)
         {
-            return new TimeSpan( date.Hour, date.Minute, date.Second);
+            return new TimeSpan(date.Hour, date.Minute, date.Second);
         }
 
         public static implicit operator Date(double days)

ToolGood.Algorithm/_base/Operand.cs

@@ -133,29 +133,23 @@ internal Operand(string opd)
         /// </summary>
         internal object Value { get; private set; }
 
-        public string Parameter
-        {
-            get
-            {
+        public string Parameter {
+            get {
                 return Value.ToString().TrimEnd();
             }
         }
 
-        internal double NumberValue
-        {
-            get
-            {
+        internal double NumberValue {
+            get {
                 if (Type == OperandType.BOOLEAN) {
                     return (bool)Value ? 1 : 0;
                 }
                 return (double)Value;
             }
         }
         internal string StringValue { get { return Value.ToString(); } }
-        internal bool BooleanValue
-        {
-            get
-            {
+        internal bool BooleanValue {
+            get {
                 if (Type == OperandType.NUMBER) {
                     if (Value is double) {
                         return (double)Value != 0;
@@ -226,8 +220,8 @@ public bool CanTransitionTo(OperandType operandType)
             if (operandType == Type) return true;
             if (Type == OperandType.ERROR) return false;
 
-            if (operandType== OperandType.STRING) return true;
-            if (operandType== OperandType.NUMBER) {
+            if (operandType == OperandType.STRING) return true;
+            if (operandType == OperandType.NUMBER) {
                 return IsNumber(this.Value);
             }
             if (operandType == OperandType.DATE) {
@@ -274,9 +268,9 @@ public static OperandType ConvertOperand(string opd)
         /// <returns></returns>
         public static bool IsBoolean(object value)
         {
-            if (value is Int16|| value is Int32|| value is Int64||
-                value is UInt16|| value is UInt32|| value is UInt64||
-                value is double|| value is float|| value is decimal) {
+            if (value is Int16 || value is Int32 || value is Int64 ||
+                value is UInt16 || value is UInt32 || value is UInt64 ||
+                value is double || value is float || value is decimal) {
                 return true;
             }
 

ToolGood.Algorithm/_base/OperandType.cs

@@ -23,7 +23,7 @@ public enum OperandType
         /// 日期
         /// </summary>
         DATE,
-        
+
         /// <summary>
         /// 数组
         /// </summary>

ToolGood.Algorithm/_base/Operator.cs

@@ -89,7 +89,7 @@ public static bool IsBinaryOperator(ref Stack<object> tokens, ref Stack<Operator
             }
             object token = tokens.Peek();
             if (token is Operand) {
-                return operators.Peek().Type != OperatorType.LB ;
+                return operators.Peek().Type != OperatorType.LB;
             } else {
                 return ((Operator)token).Type == OperatorType.RB;
             }

ToolGood.Algorithm/_base/OperatorType.cs

@@ -24,7 +24,7 @@ internal enum OperatorType
         /// 创建数组
         /// </summary>
         CREATEARRARY,
-        
+
         /// <summary>
         /// 函数
         /// </summary>
@@ -126,7 +126,7 @@ internal enum OperatorType
         /// <summary>
         /// 逻辑或,|,OR
         /// </summary>
-        OR, 
+        OR,
 
         /// <summary>
         /// 逗号,comma