Structures 1: Simple Structure, Nested Structure, The C Puzzle book, p.63

Puzzle book
C Puzzle Bookの有り難み5つ、C言語規格及びCコンパイラの特性を認識, error(21), coding(28)
https://qiita.com/kaizen_nagoya/items/d89a48c1536a02ecdec9

The C Puzzle Book
https://efrei.poupa.net/Programmation%20en%20C/Cours/The_C_Puzzle_Book.pdf

defs.h "The C Puzzle Book"
https://qiita.com/kaizen_nagoya/items/6d284651ac1244963bd9

cf1.c, The C Puzzle Book
https://qiita.com/kaizen_nagoya/items/6b6c4b055b279502b13e

cf2.c THe C Puzzle book
https://qiita.com/kaizen_nagoya/items/0b05578f5d110487a1d3

cf3.c The C Puzzle Book
https://qiita.com/kaizen_nagoya/items/61c4c9c7382d5425d5f6

cf4.c The C Puzzle Book
https://qiita.com/kaizen_nagoya/items/2900320cb219aaa07211

program style 1, The C Puzzle book
https://qiita.com/kaizen_nagoya/items/9870d16747a82df61c58

The C Puzzle Book: Operators 1: Basic Arthmetic Operations
https://qiita.com/kaizen_nagoya/items/2a0d8277d72bfc579df6

c puzzle book op6.c
https://qiita.com/kaizen_nagoya/items/cd7a04de6b846becb2a4

c puzzle book op6.c install error
https://qiita.com/kaizen_nagoya/items/4542e50784561d5d3d3e

c puzzle book basic type 1
https://qiita.com/kaizen_nagoya/items/fdf42293421b7705c14f

c puzzle book basic type 2.c
https://qiita.com/kaizen_nagoya/items/81fb10b331cc7be90654

c puzzle book basic type 3
https://qiita.com/kaizen_nagoya/items/9c01c980c15951c6a3ef

Ｃ　Ｐｕｚｚｌｅ　Ｂｏｏｋをやる動機
https://qiita.com/kaizen_nagoya/items/962034c4e3812aeadee5

Ｃ＋＋版　Ｃ　ＰｕｚｚｌｅＢｏｏｋ
https://qiita.com/kaizen_nagoya/items/5dd0fe4700b39c2ccea3

Structures 1: Simple Structure, Nested Structure, p.63

st1.c

// The C Puzzle book p.63 Alan R. Feuer Bell Laboratories, Murray Hill, New Jersey
// Structures 1: Simple Structure, Nested Structure, The C Puzzle book, p.63
// https://qiita.com/kaizen_nagoya/items/f32769f4e76f5cc05776
// Dr. Kiyoshi Ogawa, 2025/06/11
#include "defs.h"

int main(void){
        static struct S1{
                char c[4], *s;
        } s1 = {"abc", "def"};

        static struct S2 {
                char * cp;
                struct S1 ss1;
        } s2 = { "ghi", { "jkl", "mno" }} ;

        PRINT2(c, s1.c[0], *s1.s);
        PRINT2(s, s1.c, s1.s);

        PRINT2(s, s2.cp, s2.ss1.s);
        PRINT2(s, ++s2.cp, ++s2.ss1.s);
}

comile and go

bash

$ gcc st1.c
$ ./a.out
s1.c[0] = a     *s1.s = d
s1.c = abc      s1.s = def
s2.cp = ghi     s2.ss1.s = mno
++s2.cp = hi    ++s2.ss1.s = no