/in/foo.cc: In function 'int main()':
/in/foo.cc:47:6: warning: 'm' is used uninitialized in this function [-Wuninitialized]
  int m,n;
      ^
/in/foo.cc:47:8: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  int m,n;
        ^