学习软件设计——C#练习（11）

1、除零异常
DivideByZeroException

using System; using System.Collections.Generic; public class MyClass { public static void Main() { Console.WriteLine("请输被除数:"); int a=int.Parse(Console.ReadLine()); Console.WriteLine("请输除数:"); int b=int.Parse(Console.ReadLine()); try { int z = a / b; } catch (DivideByZeroException e) { Console.Write("除数不能为0哦，亲" + e.Message); } finally { Console.Write("无论是否有异常，finally都会出现！"); } Console.ReadKey(); } }

2、数组越界

IndexOutOfRangeException using System; namespace ArrayException { class Array { public void CalculateSum() { int sum = 0; int[] number = new int [5]{1,1,1,1,1}; try { for (int i=1;i<=5;i++) { sum = sum + number[i]; } Console.WriteLine("The sum of the array is : {0} ",sum); } catch(IndexOutOfRangeException e) { Console.WriteLine("Index was outside the bounds of the array!"); } } } class test { public static void Main(string[] args) { Array obj=new Array(); obj.CalculateSum(); Console.ReadLine(); } } }

3、溢出异常
OverFlowException

using System; class stack { public static void over1() { try { throw new StackOverflowException(); } catch (StackOverflowException e) { Console.WriteLine(e.Message); } } public static void over2() { try { over(10); } catch (StackOverflowException e) { Console.WriteLine(e.Message); } } public static int over(int p) { return 10 + over(p+10); } public static void Main(string[] args) { over1(); over2(); //Console.WriteLine("异常的处理"); Console.ReadKey(); } }

4、格式不正确
FormatException

using System; using System.Collections.Generic; public class ExceptionTest { public static void Main(String[] args) { String s = "cat miaomiao"; try { int a=int.Parse(s); } catch (FormatException e) { Console.WriteLine("无法将该字符串转换为数字！"); Console.ReadKey(); } } }

5、finally练习
6、throw练习

using System; using System.Collections.Generic; using System.Text; public class TEApp { public static void ThrowException() { throw new Exception(); } public static void Main() { try { ThrowException(); Console.WriteLine("try"); } catch (Exception e) { Console.WriteLine("catch"); } finally { Console.WriteLine("finally"); } Console.ReadLine(); } }

7、自定义异常

using System; public class EmailException:ApplicationException { public EmailException(string e): base(e){} } class Program { static void Main() { Console.WriteLine("请输入Email地址"); string email = Console.ReadLine(); string[]substrings = email.Split('@'); try { if (substrings.Length != 2) { throw new EmailException("email地址错误"); } else { Console.WriteLine("输入正确"); } } catch (EmailException ex) { Console.WriteLine(ex.Message); } Console.ReadLine(); } }