Beispiele und Tafelbilder 25.3.2025

20250325/arrays-and-pointers-24.c

+#include <stdio.h>
+
+int main (void)
+{
+  typedef char string5[5];
+  string5 *p = { "Dies", "ist", "ein", "Test" };
+  for (int i = 0; i < 4; i++)
+    printf ("%s\n", p[i]);
+  return 0;
+}

20250325/arrays-and-pointers-24.txt

+#include <stdio.h>
+
+int main (void)
+{
+  typedef char string5[5];
+  string5 *p = { "Dies", "ist", "ein", "Test" };
+  for (int i = 0; i < 4; i++)
+    printf ("%s\n", p[i]);
+  return 0;
+}
+cassini/home/peter/bo/2025ss/ad/20250325> gcc -Wall -O3 arrays-and-pointers-24.c
+arrays-and-pointers-24.c: In function ‘main’:
+arrays-and-pointers-24.c:6:18: warning: initialization of ‘char (*)[5]’ from incompatible pointer type ‘char *’ [-Wincompatible-pointer-types]
+    6 |   string5 *p = { "Dies", "ist", "ein", "Test" };
+      |                  ^~~~~~
+arrays-and-pointers-24.c:6:18: note: (near initialization for ‘p’)
+arrays-and-pointers-24.c:6:26: warning: excess elements in scalar initializer
+    6 |   string5 *p = { "Dies", "ist", "ein", "Test" };
+      |                          ^~~~~
+arrays-and-pointers-24.c:6:26: note: (near initialization for ‘p’)
+arrays-and-pointers-24.c:6:33: warning: excess elements in scalar initializer
+    6 |   string5 *p = { "Dies", "ist", "ein", "Test" };
+      |                                 ^~~~~
+arrays-and-pointers-24.c:6:33: note: (near initialization for ‘p’)
+arrays-and-pointers-24.c:6:40: warning: excess elements in scalar initializer
+    6 |   string5 *p = { "Dies", "ist", "ein", "Test" };
+      |                                        ^~~~~~
+arrays-and-pointers-24.c:6:40: note: (near initialization for ‘p’)
+arrays-and-pointers-24.c:8:22: warning: array subscript 10 is outside array bounds of ‘char[5]’ [-Warray-bounds]
+    8 |     printf ("%s\n", p[i]);
+      |                      ^
+arrays-and-pointers-24.c:8:22: warning: array subscript 15 is outside array bounds of ‘char[5]’ [-Warray-bounds]
+arrays-and-pointers-24.c:8:22: warning: offset ‘5’ outside bounds of constant string [-Warray-bounds]
+arrays-and-pointers-24.c:8:22: warning: offset ‘10’ outside bounds of constant string [-Warray-bounds]
+arrays-and-pointers-24.c:8:22: warning: offset ‘15’ outside bounds of constant string [-Warray-bounds]
+cassini/home/peter/bo/2025ss/ad/20250325> ./a.out
+Dies
+
+;(
+
+cassini/home/peter/bo/2025ss/ad/20250325>

20250325/arrays-and-pointers-25.c

+#include <stdio.h>
+
+int main (void)
+{
+  typedef char string8[8];
+  string8 *p = { "Dies", "ist", "ein", "Test" };
+  for (int i = 0; i < 4; i++)
+    printf ("%s\n", p[i]);
+  return 0;
+}

20250325/arrays-and-pointers-25.s

+	.file	"arrays-and-pointers-25.c"
+	.text
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"Dies"
+	.section	.text.startup,"ax",@progbits
+	.p2align 4
+	.globl	main
+	.type	main, @function
+main:
+.LFB11:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	leaq	.LC0(%rip), %rdi
+	call	puts@PLT
+	leaq	8+.LC0(%rip), %rdi
+	call	puts@PLT
+	leaq	16+.LC0(%rip), %rdi
+	call	puts@PLT
+	leaq	24+.LC0(%rip), %rdi
+	call	puts@PLT
+	xorl	%eax, %eax
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	main, .-main
+	.ident	"GCC: (Debian 12.2.0-14) 12.2.0"
+	.section	.note.GNU-stack,"",@progbits

20250325/arrays-and-pointers.ChangeLog

+Version 1:
+
+  Neues Programm: Array von Strings ausgeben
+
+Version 2:
+
+  Nicht mehr Strings ausgeben, sondern die Adressen.
+
+Version 3:
+
+  Adressen nicht mit %d ausgeben, sondern mit %z
+
+[14:33:29] (Kanal) kriexinger:
+https://semver.org/lang/de/ Diese Art Versionierung ist ganz gut, finde ich.
+Wenn man es manuell machen wil....