Recursion int param const issue

[Joe101]

Hi,
I am running the code below but I get the error

invalid suffix n on integer constant

This error relates to the bolded line below at the first recursive call. Apparently I can't pass the paramater back again to the method. Any suggestions here?

#include <iostream>

using namespace std;

class Sequence{
public:
void dCount(long  n);
Sequence();
~Sequence();

private:
long count;

};


void  Sequence::dCount(long n){
    count++;
    if(n ==1)
    return;

    if(n %2 ==0)
        dCount(n / 2);
    else if(n % 2 != 0){
 //NEXT LINE PRODUCES ERROR...CAN'T SEND 'n' back to method ??
       dCount(3n+1);
          }
    }

Sequence::Sequence(){
    count =0;
    }

Sequence::~Sequence(){;    }



int main()
{
Sequence s;
s.dCount(5L);


return 0;
}

[mcleano]

change the bolded line to dCount(n*3+1);

[Joe101]

thanks! whenever i encounter an error i assume that it's my lack of c++ knowledge, not some silly error like this one, that causes the problem.

[mcleano]

Yeah it happens to us all lol :) am i right in presuming you're a maths student of some sort?

'3n' thinking it will mean '3 x n' has got maths student written all over it lol.