Pointers and Arrays 2: Array of Pointer, The C Puzzle Book p.55

#include "defs.h"

int a[] = {0, 1, 2, 3, 4};
int *p[] = {a, a + 1, a + 2, a + 3, a + 4};
int **pp = p;

int main(void)
{
// a はポインタ（配列の先頭アドレス）、*a は int
PR(p, a); PRINT1(d, *a);

    // p はポインタ配列の先頭アドレス、*p は int*、**p は int
    PR(p, p); PR(p, *p); PRINT1(d, **p);

    // pp は int**、*pp は int*、**pp は int
    PR(p, pp); PR(p, *pp); PRINT1(d, **pp);

    NL;

    // それぞれインクリメント後の差分、値の表示
    pp++; PRINT3(d, pp - p, *pp - a, **pp);// W: format specifies type 'int' but the argument has type 'long' [-Wformat]
    pp++; PRINT3(d, pp - p, *pp - a, **pp);// W: format specifies type 'int' but the argument has type 'long' [-Wformat]
    ++pp; PRINT3(d, pp - p, *pp - a, **pp);// W: format specifies type 'int' but the argument has type 'long' [-Wformat]
    ++*pp; PRINT3(d, pp - p, *pp - a, **pp);//W: format specifies type 'int' but the argument has type 'long' [-Wformat]

    NL;

    // 再初期化
    pp = p;
    (void)**pp++; PRINT3(d, pp - p, *pp - a, **pp);// W: format specifies type 'int' but the argument has type 'long' [-Wformat]
    (void)*++*pp; PRINT3(d, pp - p, *pp - a, **pp);// W: format specifies type 'int' but the argument has type 'long' [-Wformat]
    ++**pp; PRINT3(d, pp - p, *pp - a, **pp);//       W: format specifies type 'int' but the argument has type 'long' [-Wformat]

    return 0;

}