2.输入某年某月某日,判断这一天是这一年的第几天?

题目:输入某年某月某日,判断这一天是这一年的第几天?
方法一:
#include
void main()
{
int year,month,daily,sum;
while(1)
{
printf("请输入年月日:/n");
scanf("%d%d%d",&year,&month,&daily);
switch(month)
{
case 1:{sum=daily;break;}
case 2:{sum=31+daily;break;}
case 3:{sum=31+28+daily;break;}
case 4:{sum=31+28+31+daily;break;}
case 5:{sum=31+28+31+30+daily;break;}
case 6:{sum=31+28+31+30+31+daily;break;}
case 7:{sum=31+28+31+30+31+30+daily;break;}
case 8:{sum=31+28+31+30+31+30+31+daily;break;}
case 9:{sum=31+28+31+30+31+30+31+31+daily;break;}
case 10:{sum=31+28+31+30+31+30+31+31+30+daily;break;}
case 11:{sum=31+28+31+30+31+30+31+31+30+31+daily;break;}
case 12:{sum=31+28+31+30+31+30+31+31+30+31+30+daily;break;}
default:{printf("你输入的月份不对,请重新输入。/n");};
}
if((year%400==0||(year%4==0 && year%100!=0) ) &&month>=2)
printf("你输入的日子是%d年的第%d天。/n",year,sum+1);
else
printf("你输入的日子是%d年的第%d天。/n",year,sum);

}

}

 

方法二:
main()
{
int day,month,year,sum,leap;
printf("/nplease input year,month,day/n");
scanf("%d,%d,%d",&year,&month,&day);
switch(month)/*先计算某月以前月份的总天数*/
{
  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("data error");break;
}
sum=sum+day;  /*再加上某天的天数*/
  if(year%400==0||(year%4==0&&year%100!=0))/*判断是不是闰年*/
   leap=1;
  else
   leap=0;
if(leap==1&&month>2)/*如果是闰年且月份大于2,总天数应该加一天*/
sum++;
printf("It is the %dth day.",sum);}

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