本人编写的一个日期推算的程序

#include<stdio.h>
#define judge(y) (y%4==0)&&(y%100!=0)(y%400==0)
int allday(int x);
int month1[]=;
int month2[]=; void main()
{ int i;

int yea1,yea2,mon1,mon2,day1,day2;
int *p;

long jia_day1=0;
long jia_day2=0;
long jia_day3=0;
long jia_day4=0;
long jia_all=0; printf("请输入第一个年月份 ");
scanf("%d %d %d",&yea1,&mon1,&day1);
printf("请输入第二个年月份 ");
scanf("%d %d %d",&yea2,&mon2,&day2);
if(judge(yea1)) printf("%d是闰年 ",yea1);
if(judge(yea2)) printf("%d是闰年 ",yea2);
if(yea1>yea2)
{ if(judge(yea2)) p=month2;
      else p=month1;
       jia_day1=*(p+mon2-1)-day2;
          for(i=mon2;i<=11;i++)
           jia_day2=jia_day2+*(p+i);
          for(i=yea2+1;i<yea1;i++)
             jia_day3=jia_day3+allday(i);
    if(judge(yea1)) p=month2;
    else p=month1;
       for(i=1;i<mon1;i++)
           jia_day4=jia_day4+*(p+i-1);
       jia_all=jia_day1+jia_day2+jia_day3+jia_day4+day1;
       printf("%d%d%d比%d%d%d迟%d天 ",yea1,mon1,day1,yea2,mon2,day2,jia_all);
   }
else if(yea1<yea2)
{ if(judge(yea1)) p=month2;
   else p=month1;
       jia_day1=*(p+mon1-1)-day1;
          for(i=mon1;i<=11;i++)
           jia_day2=jia_day2+*(p+i);
          for(i=yea1+1;i<yea2;i++)
             jia_day3=jia_day3+allday(i);
     if(judge(yea2)) p=month2;
      else p=month1;
       for(i=1;i<mon2;i++)
           jia_day4=jia_day4+*(p+i-1);
       jia_all=jia_day1+jia_day2+jia_day3+jia_day4+day2;
       printf("%d%d%d比%d%d%d迟%d天 ",yea2,mon2,day2,yea1,mon1,day1,jia_all);
   }
else
{ if(judge(yea1)) p=month2;
   else p=month1;
   if(mon1>mon2)
   { jia_day1=*(p+mon2-1)-day2;
    for(i=mon2+1;i<mon1;i++)
    jia_day2=jia_day2+*(p+i-1);
     jia_all=jia_day1+jia_day2+day1;
    printf("第一个时间比第二个时间迟%d天 ",jia_all);
    }
else if(mon1<mon2)
{   jia_day1=*(p+mon1-1)-day1;
for(i=mon1+1;i<mon2;i++)
    jia_day2=jia_day2+*(p+i-1);
     jia_all=jia_day1+jia_day2+day2;
    printf("第一个时间比第二个时间早%d天 ",jia_all);
    }
else
    {if(day1>day2)
        printf("第一个时间比第二个时间迟%d天 ",(day1-day2));
     else if(day1<day2)
        printf("第一个时间比第二个时间早%d天 ",(day2-day1));
      else printf("这俩个时间相等 ");
    }
}
}

int allday(int x)
{ int y;
if(((x%4==0)&&(x%100!=0))((x%100==0)&&(x%400==0)))
{y=366; printf("在这俩个数据中:%d是闰年 ",x);}
else y=365;
return (y);
}