麻烦看看 是什么问题

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            /*
             *瑞年的规定是：能被4整除，但是不能被100整除。或者能被400整除
             *提示：1,3,5,7,8,10,12为31天
             *4,6,9,11为30天
             *2月瑞年为29天，否则28天
             */
            int year, month, day;
            bool shRui = false;            Console.WriteLine("请输入年份：");
            year = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入月份：");
            month = int.Parse(Console.ReadLine());            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
            {
                shRui = true;//是瑞年
                if (shRui == true)
                {
                    day = 29;
                }
                else
                {
                    day = 28;
                }
            }
            if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                day = 31;
            }
            else if(month == 4 || month == 6 || month == 9 || month == 11)
            {
                day = 30;
            }
            Console.WriteLine(year+"年"+month+"月有"+day+"天");
        }
    }
}错误提示：
错误 1 使用了未赋值的局部变量“day”

Answer 1

                shRui = true;//是瑞年
                if (shRui == true)
                {
                    day = 29;
                }
                else
                {
                    day = 28;
                }   下面那个if判断有什么用嘛???  运行1w年 它也是true

Answer 2

(year % 4 == 0 && year % 100 != 0 || year % 400 == 0)这个条件不成立day就没有赋初值...在C#里要把int year, month, day;这样的坏习惯改掉...

Answer 3

day初始化时加初始值是个好习惯
(year % 4 == 0 && year % 100 != 0 || year % 400 == 0)这个条件写错鸟

Answer 4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication20
{
    class Program
    {
        public int Datareturn(int year,int month)
        {
            bool shRui = false;
            int day=0;
            if ((year % 4 == 0 && year % 100 != 0)|| year % 400 == 0)
            {
                shRui = true;//是瑞年 
                if (shRui == true)
                {
                    day = 29;
                   
                }
                else
                {
                    day = 28;
                   
                }
            }
            if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                day = 31;
               
            }
            else if (month == 4 || month == 6 || month == 9 || month == 11)
            {
                day = 30;
                
            }
            return day;          
        }
        static void Main(string[] args)
        {
            Program pr = new Program();            /* 
            *瑞年的规定是：能被4整除，但是不能被100整除。或者能被400整除 
            *提示：1,3,5,7,8,10,12为31天 
            *4,6,9,11为30天 
            *2月瑞年为29天，否则28天 
            */ 
            int year, month, day; 
           
                       Console.WriteLine("请输入年份："); 
            year = int.Parse(Console.ReadLine()); 
            Console.WriteLine("请输入月份："); 
            month = int.Parse(Console.ReadLine());
            day = pr.Datareturn(year,month);
            Console.WriteLine(year+"年"+month+"月有"+day+"天"); 
        } 
    } 
}         
    

Answer 5

 if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) 
            { 
                shRui = true;//是瑞年 
                if (shRui == true) 
                { 
                    day = 29; 
                } 
                else 
                { 
                    day = 28; 
                } 
            } 还有2月的你有问题

Answer 6

   这位兄弟想表达什么哪?????   错误什么的都没一点改动, 还帖这么一大块
  要改:    if ((year%4==0&& year%100!=0)|| year%400==0)
       {
            shRui=true;//是瑞年
                
             day=29;
                   
       }
       else
       {
           shRui=false;
           day=28;
                   
       }

Answer 7

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication20
{
    class Program
    {
        public int Datareturn(int year,int month)
        {
            bool shRui = false;
            int day=0;
            if ((year % 4 == 0 && year % 100 != 0)|| year % 400 == 0)
            {
                shRui = true;//是瑞年 
                if (shRui == true)
                {
                    day = 29;
                   
                }
                else
                {
                    day = 28;
                   
                }
            }
            if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                day = 31;
               
            }
            else if (month == 4 || month == 6 || month == 9 || month == 11)
            {
                day = 30;
                
            }
            return day;          
        }
        static void Main(string[] args)
        {
                        /* 
            *瑞年的规定是：能被4整除，但是不能被100整除。或者能被400整除 
            *提示：1,3,5,7,8,10,12为31天 
            *4,6,9,11为30天 
            *2月瑞年为29天，否则28天 
            */ 
            int year, month, day; 
            bool shRui = false;             Console.WriteLine("请输入年份："); 
            year = int.Parse(Console.ReadLine()); 
            Console.WriteLine("请输入月份："); 
            month = int.Parse(Console.ReadLine());
            day = 0;
            if (month == 2)
            {
                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                {
                    day = 29;
                }
                else
                {
                    day = 28;
                }
            }
            else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                day = 31;
            }
            else if (month == 4 || month == 6 || month == 9 || month == 11)
            {
                day = 30;
            } 
            Console.WriteLine(year+"年"+month+"月有"+day+"天"); 
                } 
    } 
}         
    

Answer 8

[Quote=引用 7 楼 hhc123 的回复:]
C# codeif (year%4==0&& year%100!=0|| year%400==0) 
            { 
                shRui=true;//是瑞年if (shRui==true) 
                { 
                    day=29; 
                }else 
                { 
                    day=28; 
                } 
            }
还有2月的你有问题——————————————————————————
请问 我的2月是什么问题 能具体回答下嘛

Answer 9

static void Main(string[] args)
        {
                        /* 
            *瑞年的规定是：能被4整除，但是不能被100整除。或者能被400整除 
            *提示：1,3,5,7,8,10,12为31天 
            *4,6,9,11为30天 
            *2月瑞年为29天，否则28天 
            */ 
            int year, month, day; 
            bool shRui = false;             Console.WriteLine("请输入年份："); 
            year = int.Parse(Console.ReadLine()); 
            Console.WriteLine("请输入月份："); 
            month = int.Parse(Console.ReadLine());
            day = 0;
            if (month == 2)
            {
                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                {
                    day = 29;
                }
                else
                {
                    day = 28;
                }
            }
            else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                day = 31;
            }
            else if (month == 4 || month == 6 || month == 9 || month == 11)
            {
                day = 30;
            } 
            Console.WriteLine(year+"年"+month+"月有"+day+"天"); 
                } 
这样已经好了没什么问题了

Answer 10

如果要完整点的话还要月份必须是1-12
 if (month >= 1 && month <= 12)
            {
                if (month == 2)
                {
                    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                    {
                        day = 29;
                    }
                    else
                    {
                        day = 28;
                    }
                }
                else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
                {
                    day = 31;
                }
                else if (month == 4 || month == 6 || month == 9 || month == 11)
                {
                    day = 30;
                }
                Console.WriteLine(year + "年" + month + "月有" + day + "天");            }
            else
            {
                Console.WriteLine("月分输入有误");            }

Answer 11

使用了未赋值的局部变量“day”