#include<stdio.h>
struct
{ int year;
int month;
int day;
}date1,date2;
void main()
{int days(int year,int month,int day);
int year(int c, int d);
int total,day_1,day_2,day;
printf("input your birthday:");
scanf("%d,%d,%d",&date1.year,&date1.month,&date1.day);
printf("input the date of today:");
scanf("%d,%d,%d",&date2.year,&date2.month,&date2.day);
day=year(date1.year,date2.year);
day_1=days(date1.year,date1.month,date1.day);
day_2=days(date2.year,date2.month,date2.day);
total=day-day_1+day_2;
printf("totall days:%d",total);}
int year(int c,int d)
{int b=0;
while(c<d)
{ if (c%4==0&&c%100!=0||c%4==0) b+=366;
else
b+=365;
c++;}
return(b);}
int days(int year,int month,int day)
{int i,a=0;
int day_tab[13]={0,31,28,31,30,31,30,31,30,31,30,31};
for(i=1;i<month;i++)
a+=day_tab[i];
a+=day;
if((year%4==0&&year%100!=0||year%4==0)&&month>=3)
a+=1;
return(a);}
算法：一：輸入出生年月日和當(dāng)前日期
二：算出從出生年至2009年的總天數(shù)
三：算出出生日期為該年中的第幾天，并從總天數(shù)中扣除
四：算出當(dāng)前日期是該年中的第幾天，并加上
五：輸出結(jié)果
