/in/foo.c: In function 'Findmax':
/in/foo.c:4:7: warning: 'max' is used uninitialized in this function [-Wuninitialized]
   a[0]=max;
   ~~~~^~~~
/in/foo.c:7:10: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return b;
          ^
/in/foo.c: In function 'main':
/in/foo.c:17:2: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",Findmax(a,n));
  ^~~~~~~~~~~~~~~~~~~~~~~~~