杭电oj疑问

#include<stdio.h>
int main()
{
int a,b,c,d;
while(scanf("%d/%d/%d",&a,&b,&c)!=EOF)
{
{if(b==1)  d=c;
else if(b==2)  d=c+31;
else if(b==3)  d=c+31+28;
else if(b==4)  d=c+31+28+31;
else if(b==5)  d=c+31+28+31+30;
else if(b==6)  d=c+31+28+31+30+31;
else if(b==7)  d=c+31+28+31+30+31+30;
else if(b==8)  d=c+31+28+31+30+31+30+31;
else if(b==9)  d=c+31+28+31+30+31+30+31+31;
else if(b==10) d=c+31+28+31+30+31+30+31+31+30;
else if(b==11) d=c+31+28+31+30+31+30+31+31+30+31;
else if(b==12) d=c+31+28+31+30+31+30+31+31+30+31+30;}
if((a%4==0&&a%100!=0)||(a%400==0))  d=d+1;
else d=d;
printf("%d\n",d);
}
return 0;
}


#include<stdio.h>
main()
{
int x,y.sum1,sum2,temp;

while(scanf("%d %d",&x,&y)!=EOF)
{
sum1=0;
sum2=0;
if(x>y)
{
temp=x;x=y;y=temp;
}
for(;x<=y;x++)
{
if(x%2==0)  sum1+=x*x;
if(x%2==1)  sum2+=x*x*x;
}
printf("%d %d\n",sum1,sum2);
}
}


#include<stdio.h>
main()
{
int n,s,i,a;
while(scanf("%d",&n)!=EOF)
{
s=1;
for(i=0;i<n;i++)//(？？？？？从0开始而不是从1开始)
{
scanf("%d",&a);
if(a%2)  s=s*a;
else ;}