foo.c: In function 'main':
foo.c:51:13: warning: 'b' is used uninitialized [-Wuninitialized]
   51 |             printf("%d", b[0]);
      |             ^~~~~~~~~~~~~~~~~~
foo.c:15:13: note: 'b' declared here
   15 |         int b[100],c=0;
      |             ^

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