C#编程基础 实验（7） (1-2)

1.将百分制转换成五分制，如果输入的百分制成绩超出0~100时，程序抛出异常。

代码如下：

using System;using System.Collections;using System.Collections.Generic; namespace Program{    class OverflowRange : ApplicationException    {        public OverflowRange(string msg):base(msg)        { }    }    class Program    {               static void Main(string[] args)        {            try            {                Console.Write("输入一个百分数：");                int num = Convert.ToInt32(Console.ReadLine());                if (num < 0 || num > 100)                {                    throw new OverflowRange("数值不在0~100之间");                }                double result = (double)num * 5.0 / 100;                Console.WriteLine("转换成五分制为：{0}", result);            }            catch (FormatException)            {                Console.WriteLine("必须输入数字");            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }            finally            {                Console.ReadKey();            }        }    }    }

2.编写一个计算阶乘的程序，当输入的数据是带小数时，引发异常。

using System;using System.Collections;using System.Collections.Generic; namespace Program{    class WithoutDecimal : ApplicationException    {        public WithoutDecimal(string msg):base(msg)        { }    }    class Program    {               static void Main(string[] args)        {            try            {                Console.Write("输入一个数：");                double num = Convert.ToDouble(Console.ReadLine());                if (num - (int)num != 0)                {                    throw new WithoutDecimal("输入的数据带小数");                }                int sum = 1;                for (int i = 2; i <= (int)num; i++)                {                    sum *= i;                }                Console.WriteLine("{0}的阶乘为{1}", num, sum);            }            catch (FormatException)            {                Console.WriteLine("必须输入数字");            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }            finally            {                Console.ReadKey();            }        }    }    }