csharp基础练习题:圆的面积【难度：1级】--景越C#经典编程题库,不同难度C#练习题，适合自学C#的新手进阶训练

csharp基础练习题:圆的面积【难度:1级】:

完成函数

 circleArea

,以便它返回给定

半径

的圆的区域.将返回的数字舍入到两个小数位(Haskell除外).如果半径不是正数或不是数字,则返回

 false

例:

Circle.area(-1485.86); //返回false
Circle.area(0); //返回false
Circle.area(43.2673); //返回5881.25
Circle.area(68); //返回14526.72

circleArea(-1485.86); //返回false
circleArea(0); //返回false
circleArea(43.2673); //返回5881.25
circleArea(68); //返回14526.72
circleArea( "数字"); //返回false

circleArea(-1)`shouldBe`没什么
circleArea 0`beaBe`没什么
circleArea 1`beaBe`Just(pi)
circleArea 2`beaBe` Just(4 * pi)
circleArea 3`beaBe` Just(9 * pi)

circleArea(-1485.86)#returns false
circleArea(0)#returns false
circleArea(43.2673)#returns 5881.25
circleArea(68)#returns 14526.72
circleArea("number")#returns false

Kata.CalculateAreaOfCircle( " -  123"); //抛出ArgumentException
Kata.CalculateAreaOfCircle( "0"); //抛出ArgumentException
Kata.CalculateAreaOfCircle( "43.2673"); //返回5881.25
Kata.CalculateAreaOfCircle( "68"); //返回14526.72
Kata.CalculateAreaOfCircle( "数字"); //抛出ArgumentException

circle_area(-1485.86)#returns false
circle_area(0)#returns false
circle_area(43.2673)#returns 5881.25
circle_area(68)#returns 14526.72
circle_area("number")#returns false

编程目标:

using System;
public static class Kata
{
  public static double CalculateAreaOfCircle(string radius)
  {   
    //Solve!
  }
}

测试样例:

using System;
using NUnit.Framework;
[TestFixture]
public class AreaOfCircleTests
{
  [Test]
  public void ShouldFailNegativeNumber()
  {
    .( { .("-123"); });
    //Assert.Throws(typeof(ArgumentException), Kata.CalculateAreaOfCircle("-123"));
  }
  [Test]
  public void ShouldFailAlphaNumeric()
  {
    Assert.Throws(delegate { Kata.CalculateAreaOfCircle("number"); });
  }