foo.c: In function ‘main’:
foo.c:15:9: warning: ‘mid’ may be used uninitialized [-Wmaybe-uninitialized]
   15 |         printf("%d %d",mid,max);
      |         ^~~~~~~~~~~~~~~~~~~~~~~
foo.c:5:23: note: ‘mid’ was declared here
    5 |         int a,b,c,max,mid;
      |                       ^~~