New to c++

Could you tell me why I get these errors?
C:\Windows\Desktop\finally\banking.cpp(61) : error C2660: 'setnum' : function does not take 0 parameters

C:\Windows\Desktop\finally\banking.cpp(62) : error C2065: 'n' : undeclared identifier


In my void main I wrote this:
b1.setnum(int n);
n=b1.getnum();

Here is the class and the methods
class Account
{
private:
     int num;
     int type;
     float balance;
public:
     void setnum(int n);
     void settype(int t);
     void setbalance(float b);
     int getnum();
     int gettype();
     float getbalance();
};

#endif


#include "Account.h"

void Account::setnum (int n)
{
     num=n;
}
void Account::settype (int t)
{
     type=t;
}
void Account::setbalance(float b)
{
     balance=b;
}
int Account::getnum()
{
     return num;
}
int Account::gettype()
{
     return type;
}
float Account::getbalance()
{
     return balance;
}