pointer_arr.c

#include <stdio.h>

void init_arr(int (*arr)[2]) {
    int i, j, cnt = 1;

    for(i=0; i<3; i++) {
        for(j=0; j<2; j++) {
            arr[i][j] = cnt++;
        }
    }       
}

void print_arr(int (*arr)[2]) {
    int i, j;

    for(i=0; i<3; i++) {
        for(j=0; j<2; j++) {
            printf("arr[%d][%d] = %d\n", i, j, arr[i][j]);
        }
    }
}

void init_pnt_arr(int **pnt_arr, int (*arr)[2]) {
    int i;

    for(i=0; i<3; i++) {
        pnt_arr[i] = arr[i];
    }   
}

void test_arr_pnt(int (*p)[3]) {
   int i, j;

   for(i=0; i<2; i++) {
        for(j=0; j<3; j++) {
            printf("p[%d][%d] = %d\n", i, j, p[i][j]);
        }   
   }
}

void test_arr_func(int (*p)[2]) {
    printf("**p = %d\n", **p);
    printf("*(*p+1) = %d\n", *(*p+1));
    printf("*(*p+3) = %d\n", *(*p+3));
    printf("**(p+1) = %d\n", **(p+1));
    printf("**(p+2) = %d\n", **(p+2)); 
}

void test_p_func(int (*p)[3]) {
    printf("**p = %d\n", **p);
    printf("*(*p+1) = %d\n", *(*p+1));
    printf("*(*p+2) = %d\n", *(*p+2));
    printf("**(p+1) = %d\n", **(p+1));
    printf("*(*(p+1)+2) = %d\n", *(*(p+1)+2)); 
}

int main(void) {
    int i;
    int arr[3][2] = {0};
    int *pnt_arr[3] = {0}; // 포인터 배열

    int (*p)[3] = NULL; // 배열 포인터

    init_arr(arr);
    print_arr(arr);

    init_pnt_arr(pnt_arr, arr);

    for(i=0; i<3; i++) {
        printf("*pnt_arr[%d] = %d\n", i, *pnt_arr[i]);
    }
    
    p = arr;
    test_arr_pnt(p);
    test_arr_func(arr);
    test_p_func(p);
    return 0;
}