[C语言][100例题]根据年月日判断是一年中的第几天
#include <stdio.h>/*
题目：输入某年某月某日，判断这一天是这一年的第几天？
特殊情况，闰年且输入月份大于3时需考虑多加一天
*/
typedef enum {
Jan = 31,Feb = 28,Mar = 31,Apr = 30,May = 31,June = 30,
July = 31,Aug = 31,Sep = 30,Oct = 31,Nov = 30,Dec = 31
}month_day;
int _4_main()
{
int count_day = 0;
int year,month,day;
printf("输入年月日(yyyy-mm-dd):");
scanf("%d-%d-%d",&year,&month,&day);
count_day += day;
// 判断是否是闰年
_Bool flag = 0;
if(((year%100!= 0)&&(year%4 == 0))||(year%100 != 0)&&(year%400 == 0)) flag == 1;
switch (month) {
case 12:count_day += Nov;
case 11:count_day += Oct;
case 10:count_day += Sep;
case9:count_day += Aug;
case8:count_day += July;
case7:count_day += June;
case6:count_day += May;
case5:count_day += Apr;
case4:count_day += Mar;
case3:count_day += (flag ? Feb+1 : Feb);
case2:count_day += Jan;
case1:;
}
printf("%d-%02d-%02d是一年中的第%d天",year,month,day,count_day);
return 0;
}
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