Pointer arithmetic

type X [10][5][10];
d = { "bool": 1, "char": 1, "int": 4, "float": 4, "double": 8 };
    X:
        T=type(*)[5][10],
        sizeof(T) = 5*10,
        I
    X+k (X[k]):
        T=type(*)[5][10],
        sizeof(T) = 5*10*d[type],
        I+k(5*10)*d[type]
    *(X+k)+j (X[k][j]):
        T=type(*)[10],
        sizeof(T) = 10*d[type],
        I+k(5*10)*d[type]+j(10)*d[type]
    *(*(X+k)+j)+i (X[k][j][i]):
        T=type(*),
        sizeof(T) = d[type],
        I+k(5*10)*d[type]+j(10)*d[type]+i*d[type]

int ex_1(){
    char X[10][5][10];
    cout << (int) X << " " << typeid(X).name() << " char (*)[5][10]\n";
    cout << (int) (*(*X-4)+2) << " == " << (((int) X)-4*10*1+2*1)
         <<  " " << typeid((*(*X-4)+2)).name() << "  char (*)\n";
    cout << (int) X[-1] << " == " << (((int) X)-1*5*10*1)
         <<  " " << typeid(X[-1]).name() << " char (*)[10]\n";
    // both are undefined
}