我要评论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;
}
/// <summary>
/// 使形式参数变成引用传递，加上ref
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
static void swap1(ref double x, ref double y)
{
double z = x;
x = y;
y = z;
}
/// <summary>
/// out应用
/// </summary>
/// <param name="r"></param>
/// <param name="zhouchang"></param>
/// <returns></returns>
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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