foo.cc: In function 'int main()':
foo.cc:8:10: warning: 'xmin' is used uninitialized in this function [-Wuninitialized]
    8 |  for(int i=xmin;i<=xmax;i++)
      |          ^
foo.cc:8:18: warning: 'xmax' is used uninitialized in this function [-Wuninitialized]
    8 |  for(int i=xmin;i<=xmax;i++)
      |                 ~^~~~~~

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