/in/foo.cc: In function 'int main()':
/in/foo.cc:6:18: warning: 'n' is used uninitialized [-Wuninitialized]
    6 |         while (n == 1)
      |                ~~^~~~
/in/foo.cc:5:13: note: 'n' was declared here
    5 |         int n, a, b, ans;
      |             ^