Question

C#程序设计？编一个程序，定义常量Pi=3.14159265,从键盘上输入半径r,求出圆的面积。谢谢了，大神帮忙啊

Answer 1

public const int Pi = 3.14159265; Console.WriteLine("请输入r：");int r = int.Parse(Console.WriteLine()); int s = Pi * r * r; Console.WriteLine("结果为：" + s);

麻烦采纳，谢谢!

Answer 2

class Program
{
static void Main(string[] args)
{
const float pi = 3.1419265f;
float area;
float radius;
Console.WriteLine("请输入圆的半径：");
radius =float.Parse(Console.ReadLine()) ;
area = pi * radius * radius;
Console.WriteLine("圆的面积是：" + area);
Console.ReadKey();
}
}