C#函数的参数传递2（ref\out）（count）

using System;

namespace class1

{

class program

{

static void Main(string[] args)

{

Console.Write("请输入a=");

double a = double.Parse(Console.ReadLine());

Console.Write("请输入b=");

double b = double.Parse(Console.ReadLine());

Console.WriteLine("First");

Console.Write("\t{0} {1}", a, b);

Swap(a,b);

Console.WriteLine("\nSecond");

Console.WriteLine("\t{0} {1}" ,a,b);

Swap1(ref a, ref b);//实际参数也加上REF

Console.WriteLine("\nThird");

Console.WriteLine("\t{0} {1}", a, b);

Console.Write("请输入r=");

double r = double.Parse(Console.ReadLine());

double s = MianJiZhouChang(r, out double c);//这里的out也可以用ref代替，这个时候要为c赋初值

Console.WriteLine("面积是{0},周长是{1}",s,c);

}

static void Swap(double x, double y) {

double z = x;

x = y;

y = z;

}

///

///

///

static void Swap1(ref double x, ref double y)

{

double z = x;

x = y;

y = z;

}

///

///

///

///

static double MianJiZhouChang(double r,out double ZHOUCHANG) {

double S = Math.PI * r * r;

ZHOUCHANG = 2 * Math.PI * r;

return S;

}

}

}

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