foo.c: In function 'main':
foo.c:5:17: warning: missing braces around initializer [-Wmissing-braces]
     int a[2][3]={1,2,3,4,5,6};
                 ^
                  {    }{    }
foo.c:13:13: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int *' [-Wformat=]
    printf("%d ",p[i]);
            ~^    ~
            %ls

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