C#基础-017 简单练习-循环

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namespace 作业{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("请输入一个数字:");            int day = int.Parse(Console.ReadLine());            switch (day)            {                case 1:                case 2:                case 3:                case 4:                case 5:                    Console.WriteLine("今天是工作日");                    break;                case 6:                case 7:                    Console.WriteLine("今天是休息日");                    break;                default:                    Console.WriteLine("您的输入无效");                    break;            }            Console.WriteLine("请输入成绩");            int score = int.Parse(Console.ReadLine());            if (score > 100 || score < 0)            {                Console.WriteLine("输入不合法");            }            else  // 表示  score<=100 && score>=0            {                switch (score / 10)                {                    case 10:                        Console.WriteLine("满分");                        break;                    case 9:                        Console.WriteLine("优秀");                        break;                    case 8:                    case 7:                        Console.WriteLine("良好");                        break;                    case 6:                        Console.WriteLine("及格");                        break;                    default:                        Console.WriteLine("不及格");                        break;                }            }            Console.WriteLine("选择性别0:男\t1:女");            int gender = int.Parse(Console.ReadLine());            Console.WriteLine("请输入体重");            int weight = int.Parse(Console.ReadLine());            Console.WriteLine("请输入身高");            int height = int.Parse(Console.ReadLine());            //记录标准的体重            int standerWeight = 0;            switch (gender)            {                case 0:                    standerWeight = height - 105;                    break;                case 1:                    standerWeight = height - 100;                    break;                default:                    Console.WriteLine("不存在此性别");                    break;            }            float rate = weight * 1.0f / standerWeight;            if (rate < 0.6f)            {                Console.WriteLine("严重营养不良");            }            else if (rate < 0.8f)  // rate>=0.6 && rate<0.8            {                Console.WriteLine("中度营养不良");            }            else if (rate < 0.9)            {                Console.WriteLine("轻度营养不良");            }            else if (rate < 1.1)            {                Console.WriteLine("正常");            }            else if (rate < 1.2)            {                Console.WriteLine("轻度肥胖");            }            else            {                Console.WriteLine("肥胖");            }            Console.WriteLine("请输入学员成绩");            int score = int.Parse(Console.ReadLine());            char level = 'A';            switch (score / 10)            {                case 10:                case 9:                    level = 'A';                    break;                case 8:                    level = 'B';                    break;                case 7:                    level = 'C';                    break;                case 6:                    level = 'D';                    break;                default:                    level = 'E';                    break;            }            Console.WriteLine(level);            Console.WriteLine("请输入年份");            int year = int.Parse(Console.ReadLine());            Console.WriteLine("请输入月份");            int month = int.Parse(Console.ReadLine());            Console.WriteLine("请输入日期");            int days = int.Parse(Console.ReadLine());            //记录累加的天数            //2 20            int totalDays = 0;            totalDays += days;            month -= 1;            if (month==11)            {                totalDays += 30;                month -= 1;            }            if (month == 10)            {                totalDays += 31;                month -= 1;            }            if (month == 9)            {                totalDays += 30;                month -= 1;            }            if (month == 8)            {                totalDays += 31;                month -= 1;            }            if (month == 7)            {                totalDays += 31;                month -= 1;            }            if (month == 6)            {                totalDays += 30;                month -= 1;            }            if (month == 5)            {                totalDays += 31;                month -= 1;            }            if (month == 4)            {                totalDays += 30;                month -= 1;            }            if (month == 3)            {                totalDays += 31;                month -= 1;            }            //能执行下面的if条件的  肯定是大于2月份的            if (month == 2)            {                totalDays += 28;                month -= 1;                //判断是否为闰年 是闰年再加1                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)                {                    totalDays++;                }            }            if (month == 1)            {                totalDays += 31;                month -= 1;            }            Console.WriteLine("这是今年的第{0}天",totalDays);        }    }}
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