Exercice langage C la suite hongroise

#include
using namespace std;

int main()
{
int a,n,u;
cout<<"Tapez la valeur de a : ";cin>>a;
n=0;
u=a;

while(u!=1)
        {
        if(u%2==0)u=u/2; else u=3*u+1;
        n++;
        cout<<"u("<<n<<")="<<u<<endl;
        }
return 0;
}