请问下这题咋做
这题怎么做谢谢
int sum,flag;
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: printf("date error!");
}
sum=sum+day;
if((year%4==0&&year%100!=0)||year%400==0)
{
flag=1;
}
else
{
flag=0;
}
if(flag==1&&month>2)
sum++;
printf("%d年%d月%d日是该年的第%d天",year,month,day,sum);
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