c语言 日期倒计时 日期计算器

#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;iresult = 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++) printf("\n");

printf("***************** 求 交 流! *****************\n-------371574561@------\n");
}