第九章 9．1 定义一个结构体变量（包括年、月、日）
计算该日在本年中是第几天，注意闰年问题
解：Struct {int year; int month; int day; } date; main() {int days; printf(“Input year,month,day:”); scanf(“%d,%D,%d”,&date
year,&date
month,&date
day); switch(date
month) {case 1: days=date
day; break; case 2: days=date
day+31; break; case 3: days=date
day+59; break; case 4: days=date
day+90; break; case 5: days=date
day+120; break; case 6: days=date
day+31; break; case 7: days=date
day+181; break; case 8: days=date
day+212; break; case 9: days=date
day+243; break; case 10: days=date
day+273; break; case 11: days=date
day+304; break; case 12: days=date
day+334; break; } if((date
year%4==0&&date
year%100
=0||date
year%400==0)&&date
month>=3)days+=1; printf(“\n%d/%d is the %dth day in%d
”,date
month,data
day,days,date,year); } 9
2 写一个函数 days,实现上
