/in/foo.cc: In function 'int main()':
/in/foo.cc:5:16: warning: 'm' is used uninitialized in this function [-Wuninitialized]
  int num = m * n;
                ^
/in/foo.cc:5:16: warning: 'n' is used uninitialized in this function [-Wuninitialized]
/in/foo.cc:8:2: warning: 'k' is used uninitialized in this function [-Wuninitialized]
  if (k > nOk) {
  ^~