What's problem?

Question

int k, l;
k=3;
l=++k;
cout << k , l<<endl<<endl;
//с вычитанием тоже самое --
int m, n;
m=3;
n=m++;
cout << m, n<<endl<<endl;

Answer 1

You can't do it like this:
cout << k, l

Do this instead:
cout << k << ", " << l

The same mistake is also in the last line.