Why this code is not working

#1

#include
using namespace std;
typedef long long ll;
ll lcm(ll a,ll b)
{
ll gcd=(b==0?a:lcm(b,a%b));
ll alcm=(a*b)/gcd;
return alcm;
}
int main() {
ll N1,N2;
cin>>N1>>N2;
cout<<lcm(N1,N2);
return 0;
}

#2

@guptanikhil898
You first have to calculate gcd and then do a*b/gcd;
you need to separate the gcd function. and then do that.

#3

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