Not able to understand code

#1

#include

using namespace std;

void lx(int start,int end)
{
int a;
if(start==0)
a=1;
else
a=0;
for(int i=a;i<=9;i++)
{
if(start10+i>end)
return;
cout<<start10+i<<" ";
lx(start*10+i,end);
}
}

int main()
{
cout<<"0 ";
int n;
cin>>n;
lx(0,n);
}

#2

hi @uvanshika,
save your code i can see hello world only

#3

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