/* 20160324 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Ch06
{
class Program
{
//params 参数数组
static int SumVals(params int[] vals)
{
int sum = 0;
foreach (int val in vals)
{
sum += val;
}
return sum;
}
//值引用, 1.val is not an const value; 2. val must be initialized
static void showDouble(ref int val)
{
val *= 2;
return;
}
//6.4 struct function 结构函数
struct CustomerName
{
public string firstName, lastName;
public string WriteName()
{
return firstName + " " + lastName;
}
}
//6.5 函数重载
static int MaxValue(params int[] inArray)
{
int maxVal = inArray[0];
for (int i = 1; i < inArray.Length; i++)
{
if (inArray[i] > maxVal)
maxVal = inArray[i];
}
return maxVal;
}
static double MaxValue(params double[] inArray)
{
double maxVal = inArray[0];
for (int i = 1; i < inArray.Length; i++)
{
if(inArray[i]>maxVal)
maxVal = inArray[i];
}
return maxVal;
}
//6.6 delegate 委托
//1.委托的返回值和参数与函数的返回值和参数相同
delegate double ProcessDelegate(double param1, double param2);
static double Multiply(double param1, double param2)
{
return param1 * param2;
}
static double Divide(double param1, double param2)
{
return param1 / param2;
}
static void Main(string[] args)
{
//params 参数数组，并不限定输入的参数个数
int sum = SumVals(1,5,2,4,5);
Console.WriteLine("Summed Values = {0}, ",sum);
sum = SumVals(2, 4, 6, 8, 10, 12, 14, 16);
Console.WriteLine("Summed Values = {0}.", sum);
//Main函数参数，带参数执行
//右击项目名称，选择属性，选择调试，添加命令行参数，运行
foreach(string arg in args)
{
Console.WriteLine("{0}",arg);
}
Console.WriteLine("{0} command line argument were specified.", args.Length);
//ref 引用类型参数，函数内部改变参数值的方法
Console.WriteLine("Please enter a number.");
int enterInt;
enterInt = Convert.ToInt32(Console.ReadLine());
showDouble(ref enterInt);
Console.WriteLine("double is {0}.", enterInt);
//结构函数，结构中定义函数
CustomerName myCustomer;
myCustomer.firstName = "John";
myCustomer.lastName = "Franklin";
Console.WriteLine(myCustomer.WriteName());
//函数的重载，相同函数名，不同的返回值类型和参数类型
double result = MaxValue(1, 2, 3, 4, 5.2);
Console.WriteLine("max number {0}", result);
//delegate 委托
//定义委托
ProcessDelegate process;
Console.WriteLine("Enter 2 numbers separated with a comma:");
string inputString = Console.ReadLine();
int commaPos = inputString.IndexOf(',');
double param1 = Convert.ToDouble(inputString.Substring(0, commaPos));
double param2 = Convert.ToDouble(inputString.Substring(commaPos + 1, inputString.Length - commaPos - 1));
Console.WriteLine("Enter M to mutiply or D to Divide:");
inputString = Console.ReadLine();
if (inputString == "M")
process = new ProcessDelegate(Multiply);//将委托初始化为函数引用Multiply，可简写为process = Multiply;
else
process = new ProcessDelegate(Divide);//将委托初始化为函数引用Divide，可简写为processs = Divide;
Console.WriteLine("Result:{0}", process(param1, param2));//使用委托变量调用它引用的函数
Console.ReadKey();
}
}
}
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