这是一个用C写的 日期倒计时的程序

#include"stdio.h"

int year,month,day,year1,month1,day1,result,n,i,x,y;

int table[]={29,31,28,31,30,31,30,31,31,30,31,30,31}; //定义每个月的天数

int table1[] = {28,31,29,31,30,31,30,31,31,30,31,30,31};

main()

{

printf("请输入起始日期和终止日期\n 格式如yyyy mm dd yyyy mm dd\n");

scanf("%d%d%d%d%d%d",&year,&month,&day,&year1,&month1,&day1); //输入函数

if(year*100+month*10+day>year1*100+month1*10+day1||year<1||year1<1||

month<1||month>12||month1<1||month1>12||

day<1||day1<1||

day>table1[month]||day1>table1[month1]) //检测输入是否正确

printf("格式不正确！");

else if(year%4!=0 && month==2 && day>28)

printf("格式不正确！");

else if(year1%4!=0 && month1==2 && day1>28)

printf("格式不正确！"); //对于非闰年2月的检测

else

{

x = month;

y = year;

if(year==year1) //while they are in the same year!

{

if(month==month1) // and the same month!

result = day1-day; // so....

else //the same year but different monthes.

{

if(year%4==0 && month==2)

result = table[0]-day;

else

result = table[month]-day; //英语不够用啦，先将起始年的起始月剩余天数算出。

for(month++;month

{

if(year%4==0 && month==2)

result = result + table[0];

else

result = result+table[month]; //将整月的天数加起来！

}

result = result+day1; //最后一个月包含的天数加起来@！

}

}

else //when they are in different years. similar to上面的。

{

if(year%4==0 && month==2)

result = table[0]-day;

else

result = table[month]-day;

for(month++;month<=12;month++)

if(year%4==0 && month==2)

result = result + table[0];

else

result = result + table[month];

for(year++;year

{

if(year%4==0)

result = result + 366;

else

result = result + 365;

}

for(i=1;i

result = result + table[i];

result = result + day1;

}

printf("%d年%d月%d日到%d年%d月%d日\n还有%d天\n",year,x,day,year1,month1,day1,result); //输出结果

}

for(i=0;i<5;i++) print

f("\n");

printf("***************** 求 交 流! *****************\n-------371574561@http://doc.xuehai.net------\n");

}