main.c

//
//  main.c
//  helloworld
//
//  Created by kitazume yu on 11/11/24.
//  Copyright (c) 2011年 none. All rights reserved.
//

#include <stdio.h>

void line(void);
void char_test(void);
void str_test(void);
void str_stock_test(void);

void line(void)
{
    printf("----------------\n");
}

int main (int argc, const char * argv[])
{
    char_test();
    line();
    str_test();
    line();
    str_stock_test();
    
    return 0;
}

void char_test(void)
{
    char c = 'a';
    printf("%c\n", c);
    printf("%p\n", &c);
}

void str_test(void)
{
    char str[] = "abc";
    char *p = str;
    printf("%s\n", str);     // abc
    printf("%p\n", p);       // 0x7fff5fbff93b
    printf("%p\n", &str);    // 0x7fff5fbff93b
    printf("%c\n", str[0]);  // a
    printf("%p\n", &str[1]); // 0x7fff5fbff93c
    line();
    
    for (int i = 0; str[i] != '\0'; i++) {
        printf("%c\n", str[i]);
    }
}

void str_stock_test(void)
{
    char *str_stack[] = {
        "Iaa",
        "bbb",
        NULL
    };
    char **q = str_stack;
    printf("%s\n", str_stack[0]); // Iaa
    printf("%p\n", str_stack);    // 0x7fff5fbff910
    printf("%p\n", q);            // 0x7fff5fbff910
    printf("%s\n", *str_stack);   // Iaa
    printf("%c\n", **str_stack);  // I
    line();
    
    for (int i = 0; str_stack[i] != NULL; i++) {
        printf("%s\n", str_stack[i]);
    }

}