Difference between pointer to pointer and pointer to array?

Line 11 is

        p1 = &a;

where p1 has type int ** and a has type int[3], right?

Well; &a has type int(*)[3] and that type is not compatible with int** as the compiler told you

You may want to try

        p1 = &p0;

And read the c-faq, particularly section 6.

In short: arrays are not pointers, and pointers are not arrays.

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