foo.cc: In function ‘int main()’:
foo.cc:9:18: warning: ‘c’ may be used uninitialized [-Wmaybe-uninitialized]
    9 |                 c=c+xmin;
      |                 ~^~~~~~~
foo.cc:5:23: note: ‘c’ was declared here
    5 |         int xmin,xmax,c;
      |                       ^