Using the GNU Compiler Collection (GCC): Pointers to Arrays

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### 6.24 Pointers to Arrays with Qualifiers Work as Expected

In GNU C, pointers to arrays with qualifiers work similar to pointers to other qualified types. For example, a value of type `int (*)[5]` can be used to initialize a variable of type `const int (*)[5]`. These types are incompatible in ISO C because the `const` qualifier is formally attached to the element type of the array and not the array itself.

    extern void
    transpose (int N, int M, double out[M][N], const double in[N][M]);
    double x[3][2];
    double y[2][3];
    …
    transpose(3, 2, y, x);