思路清晰 switch+if 就OK了

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<string.h>

int main()

{

struct time

{

int year;

int mon;

int day;

}t;

int sum=0;

scanf("%d %d %d",&t.year,&t.mon,&t.day);

switch(t.mon)//不用break跳出；

{

case 12:sum=sum+t.day;

case 11:

if(t.mon>11)

sum=sum+30;

else sum=sum+t.day;

case 10:

if(t.mon>10)

sum=sum+31;

else sum=sum+t.day;

case 9:

if(t.mon>9)

sum=sum+30;

else sum=sum+t.day;

case 8:

if(t.mon>8)

sum=sum+31;

else  sum=sum+t.day;

case 7:

if(t.mon>7)

sum=sum+31;

else  sum=sum+t.day;

case 6:

if(t.mon>6)

sum=sum+30;

else  sum=sum+t.day;

case 5:

if(t.mon>5)

sum=sum+31;

else  sum=sum+t.day;

case 4:

if(t.mon>4)

sum=sum+30;

else  sum=sum+t.day;

case 3:

if(t.mon>3)

sum=sum+31;

else  sum=sum+t.day;

case 2:

if((t.year%4==0&&t.year%100!=0)||t.year%400==0)

sum=sum+29;

else sum=sum+28;

case 1:

if(t.mon>1)

sum=sum+31;

else  sum=sum+t.day;

}

printf("%d",sum);

return 0;

}