请高手看看，这代码怎么了！谢谢!输入年月日，求这天是这年的第几天！

[zeroman20]

#include"iostream.h"
int year,month,day,date;
void ryear();
void pyear();

void main()
{
cout<<"Please input year month day:";
cin>>"year,month,day">>"\n";
if (year%4==0)
ryear();
else
pyear();
}
void ryear()
{
switch (month)
{
case 0:
case 1:
date=day;
cout<<"it is"<<"date";
break;
case 2:
date=day+31;
cout<<"it is"<<"date";
break;
case 3:
date=day+60;
cout<<"it is"<<"date";
break;
case 4:
date=day+91;
cout<<"it is"<<"date";
break;
case 5:
date=day+121;
cout<<"it is"<<"date";
break;
case 6:
date=day+152;
cout<<"it is"<<"date";
break;
case 7:
date=day+182;
cout<<"it is"<<"date";
break;
case 8:
date=day+213;
cout<<"it is"<<"date";
break;
case 9:
date=day+244;
cout<<"it is"<<"date";
break;
case 10:
date=day+274;
cout<<"it is"<<"date";
break;
case 11:
date=day+305;
cout<<"it is"<<"date";
break;
case 12:
date=day+335;
cout<<"it is"<<"date";
break;
}

}
void pyear()
{
switch (month)
{
case 0:
case 1:
date=day;
cout<<"it is"<<"date";
break;
case 2:
date=day+31;
cout<<"it is"<<"date";
break;
case 3:
date=day+59;
cout<<"it is"<<"date";
break;
case 4:
date=day+90;
cout<<"it is"<<"date";
break;
case 5:
date=day+120;
cout<<"it is"<<"date";
break;
case 6:
date=day+151;
cout<<"it is"<<"date";
break;
case 7:
date=day+181;
cout<<"it is"<<"date";
break;
case 8:
date=day+212;
cout<<"it is"<<"date";
break;
case 9:
date=day+243;
cout<<"it is"<<"date";
break;
case 10:
date=day+273;
cout<<"it is"<<"date";
break;
case 11:
date=day+304;
cout<<"it is"<<"date";
break;
case 12:
date=day+334;
cout<<"it is"<<"date";
break;
}

}
请大家看看，编译时没有问题，可是构件执行时 LINK。。。时就走不下去了。
我是初学者，谢谢大虾们帮助，可能代码有问题