#include<stdio.h>
#include<stdlib.h>
#include<string.h>

struct SSS {
    char dummy[256];
    int num;
};

void print_data1(struct SSS *d, char *name)
{
    printf("%s = { [0]%d, [1]%d }\n", name, d[0].num, d[1].num);
}

void print_data2(struct SSS **d, char *name)
{
    printf("%s = { [0]%d, [1]%d }\n", name, d[0]->num, d[1]->num);
}

int main()
{
    struct SSS s1[2];
    struct SSS *s2;
    struct SSS **s3;

    // s1
    memset(s1, 0xFF, sizeof(s1));
    s1[0].num = 10;
    s1[1].num = 11;
    print_data1(s1, "s1");

    // s2
    s2 = (struct SSS *) malloc(sizeof(struct SSS) * 2);
    memset(s2, 0xFF, sizeof(struct SSS) * 2);
    s2[0].num = 20;
    s2[1].num = 21;
    print_data1(s2, "s2");

    // s3
    s3 = (struct SSS **) malloc(sizeof(struct SSS *) * 2);
    s3[0] = (struct SSS *) malloc(sizeof(struct SSS));
    s3[1] = (struct SSS *) malloc(sizeof(struct SSS));
    s3[0]->num = 30;
    s3[1]->num = 31;
    print_data1( s3, "s3(×)");
    print_data1(*s3, "s3(×)");
    print_data2( s3, "s3(○)");

    return 0;
}