foo.c: In function ‘main’:
foo.c:17:24: warning: array subscript 7 is above array bounds of ‘int[4]’ [-Warray-bounds=]
   17 |                 if(y==b[i])
      |                       ~^~~
foo.c:7:13: note: while referencing ‘b’
    7 |         int b[4]={4,6,9,11};
      |             ^