foo.c: In function 'big':
foo.c:6:26: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized]
    6 |         if (b==0) return a;
      |                          ^
foo.c:4:13: note: 'a' was declared here
    4 |         int a,b;
      |             ^

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