foo.c: In function 'main':
foo.c:13:20: warning: array subscript 2 is above array bounds of 'int[2]' [-Warray-bounds]
   13 |     int a = fenshu1[2],b = fenshu2[2];
      |             ~~~~~~~^~~
foo.c:5:9: note: while referencing 'fenshu1'
    5 |     int fenshu1[2];
      |         ^~~~~~~
foo.c:13:35: warning: array subscript 2 is above array bounds of 'int[2]' [-Warray-bounds]
   13 |     int a = fenshu1[2],b = fenshu2[2];
      |                            ~~~~~~~^~~
foo.c:6:9: note: while referencing 'fenshu2'
    6 |     int fenshu2[2];
      |         ^~~~~~~

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