int day,month,year;
Console.WriteLine("请输入年月日:");
string mStrDt=Console.ReadLine();
DateTime mDt=Convert.ToDateTime(mStrDt);
year=mDt.Year;
month=mDt.Month;
day=mDt.Day;
Console.WriteLine("请输入年月日:");
string mStrDt=Console.ReadLine();
DateTime mDt=Convert.ToDateTime(mStrDt);
year=mDt.Year;
month=mDt.Month;
day=mDt.Day;
switch(month)
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;
case 10:sum=273;break;
case 11:sum=304;break;
case 12:sum=334;break;
default:Console.WriteLine("data error");break;
}
sum=sum~~~~这里+day;编译出错,说使用了未赋值的局部变量“sum”,和C语言里的不一样啊,怎么改?
namespace Project1
{
/// <summary>
/// Class1 的摘要说明。
/// </summary>
public class Class1
{
static void Main()
{
int day,month,year,sum,leap;
Console.WriteLine("请输入年月日:");
string mStrDt=Console.ReadLine();
DateTime mDt=Convert.ToDateTime(mStrDt);
year=mDt.Year;
month=mDt.Month;
day=mDt.Day; Console.WriteLine("输入的时间为{0}年{1}月{2}日",year,month,day);
switch(month)
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;
case 10:sum=273;break;
case 11:sum=304;break;
case 12:sum=334;break;
default:Console.WriteLine("data error");break;
}
sum=sum+day;
if(year%400==0||(year%4==0&&year%100!=0))
{
leap=1;
}
else
leap=0;
if(leap==1&&month>2)
sum++;
Console.WriteLine("这是一年中的第{0}天",sum);
} }
}
帮忙看看,谢谢了