小程序页面之间进行传值的操作办法
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2022-09-11
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;
}
///
/// 使形式参数变成引用传递,加上REF
///
///
///
static void Swap1(ref double x, ref double y)
{
double z = x;
x = y;
y = z;
}
///
/// OUT应用
///
///
///
///
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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