三天打鱼2天嗮网问题

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
using namespace std;
int main()               //   三天打鱼两天晒网，周期为五天，假设1990年一月一日为
{
 long sum=0;
 int year,month,day,i,j,n,t;
 int a[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};//
 system("color 3E");
 

 cout<<"年,月,日:"<<endl;
    cin>>year>>month>>day;       //输入年，月，日
 for(n=1990;n<year;n++)
 {
  if((n%4==0&&n%100!=0)||n%400==0)
   sum=sum+366;                    //判断是否是闰年
  else
   sum=sum+365;
 }
 if((n%4==0&&n%100!=0)||n%400==0)           // 判断是否是闰年
  t=1;
 else
  t=0;
 for(i=1;i<month;i++)                     //把月份以前的天数加起来
  sum=sum+a[t][i];
 sum=sum+day;
 j=sum%5;
 if(j>0&&j<4)
  printf("He was fishing at that day.\n");               // 输出打鱼
 else
  printf("He was sleeping at that day.\n");                         //输出晒网
 return 0;
}