/in/foo.c: In function 'main':
/in/foo.c:5:9: warning: 'a' is used uninitialized in this function [-Wuninitialized]
     int max=a,min=a,mid;
         ^~~
/in/foo.c:18:5: warning: 'mid' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d %d",mid,max);
     ^~~~~~~~~~~~~~~~~~~~~~~