20231012/side-effects-04.c

-#include <stdio.h>
-
-int main (void)
-{
-  int a = 3;
-  int b = 5;
-  printf ("%d\n", a += b);
-  printf ("%d\n", a);
-  printf ("%d\n", b);
-  return 0;
-}

20231012/side-effects-05.c

-#include <stdio.h>
-
-int main (void)
-{
-  int a = 3;
-  int b = 5;
-  printf ("%d\n", a + b);
-  printf ("%d\n", a);
-  printf ("%d\n", b);
-  return 0;
-}

20231012/side-effects-11.c

-#include <stdio.h>
-
-int main (void)
-{
-  int a = 3;
-  a = (3,14);
-  printf ("%d\n", a);
-  return 0;
-}

20231012/side-effects-13.c

-#include <stdio.h>
-
-int main (void)
-{
-  int a = 137;
-  int b = 0;
-  if (b == 0)
-    printf ("Bitte nicht durch 0 teilen.\n");
-    printf ("So was macht man nicht.\n");
-  else
-    printf ("a / b = %d\n", a / b);
-  return 0;
-}

20231012/side-effects-15.c

-#include <stdio.h>
-
-int main (void)
-{
-  int a = 137;
-  int b = 0;
-  if (b == 0)
-    printf ("Bitte nicht durch 0 teilen.\n"),
-    printf ("So was macht man nicht.\n");
-  else
-    printf ("a / b = %d\n", a / b);
-  return 0;
-}

20231019/arrays-05c.c

-
-#include <stdio.h>
-
-int main (void)
-{
-  int pflll[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };
-  int prime[8] = { 2, 3, 5, 7, 11, 13, 17, 19 };
-  printf ("prime:\n");
-  for (int *p = prime; *p; p++)
-    printf ("%d\n", *p);
-  printf ("pflll:\n");
-  for (int *q = pflll; *q; q++)
-    printf ("%d\n", *q);
-  return 0;
-}

20231019/files-07.txt

-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-
-int main (void)
-{
-  FILE *f = fopen ("fhello.txt", "w");
-  if (f)
-    {
-      fprintf (f, "Hello, world!\n");
-      fclose (f);
-      return 0;
-    }
-  else
-    {
-      char *msg = strerror (errno);
-      fprintf (stderr, "Fehler: %s\n", msg);
-      return errno;
-    }
-}
-cassini/home/peter/bo/2023ws/hp/20231019> gcc -Wall -O files-07.c -o files-07
-cassini/home/peter/bo/2023ws/hp/20231019> ./files-07
-Fehler: Permission denied
-cassini/home/peter/bo/2023ws/hp/20231019> echo $?
-13
-cassini/home/peter/bo/2023ws/hp/20231019> rm fhello.txt
-rm: reguläre Datei (schreibgeschützt) 'fhello.txt' entfernen? y
-cassini/home/peter/bo/2023ws/hp/20231019> ./files-07
-cassini/home/peter/bo/2023ws/hp/20231019> echo $?
-0
-cassini/home/peter/bo/2023ws/hp/20231019> ls -l fhello.txt
--rw-r--r-- 1 peter peter 14 19. Okt 15:56 fhello.txt
-cassini/home/peter/bo/2023ws/hp/20231019> chmod -w fhello.txt
-cassini/home/peter/bo/2023ws/hp/20231019> ls -l fhello.txt
--r--r--r-- 1 peter peter 14 19. Okt 15:56 fhello.txt
-cassini/home/peter/bo/2023ws/hp/20231019> ./files-07
-Fehler: Permission denied
-cassini/home/peter/bo/2023ws/hp/20231019> echo $?
-13
-cassini/home/peter/bo/2023ws/hp/20231019>

20231019/strings-07d.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char hello[] = "Hello, world!\n";
-
-  printf ("%s\n", hello);
-  printf ("%zd\n", strlen (hello));
-
-  printf ("%s\n", hello + 17);
-  printf ("%zd\n", strlen (hello + 17));
-
-  return 0;
-
-  hello[5] = 0;
-  printf ("%s\n", hello);
-  printf ("%zd\n", strlen (hello));
-
-  return 0;
-}

20231026/string-ops-03.s

-	.file	"string-ops-03.c"
-	.text
-	.section	.rodata
-.LC0:
-	.string	"Zacharias"
-.LC1:
-	.string	"Anton"
-.LC2:
-	.string	"%d\n"
-	.text
-	.globl	main
-	.type	main, @function
-main:
-.LFB0:
-	.cfi_startproc
-	pushq	%rbp
-	.cfi_def_cfa_offset 16
-	.cfi_offset 6, -16
-	movq	%rsp, %rbp
-	.cfi_def_cfa_register 6
-	addq	$-128, %rsp
-	leaq	.LC0(%rip), %rax
-	movq	%rax, -8(%rbp)
-	leaq	.LC1(%rip), %rax
-	movq	%rax, -16(%rbp)
-	movq	-16(%rbp), %rax
-	cmpq	-8(%rbp), %rax
-	setb	%al
-	movzbl	%al, %eax
-	movl	%eax, %esi
-	leaq	.LC2(%rip), %rax
-	movq	%rax, %rdi
-	movl	$0, %eax
-	call	printf@PLT
-	movq	-8(%rbp), %rax
-	cmpq	-16(%rbp), %rax
-	setb	%al
-	movzbl	%al, %eax
-	movl	%eax, %esi
-	leaq	.LC2(%rip), %rax
-	movq	%rax, %rdi
-	movl	$0, %eax
-	call	printf@PLT
-	movl	$1, %esi
-	leaq	.LC2(%rip), %rax
-	movq	%rax, %rdi
-	movl	$0, %eax
-	call	printf@PLT
-	movl	$0, %eax
-	leave
-	.cfi_def_cfa 7, 8
-	ret
-	.cfi_endproc
-.LFE0:
-	.size	main, .-main
-	.ident	"GCC: (Debian 12.2.0-14) 12.2.0"
-	.section	.note.GNU-stack,"",@progbits

20231026/string-ops-05.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[100] = "Huber ";
-  strcat (buffer, anton);
-  printf ("%s\n", buffer);
-
-  return 0;
-}

20231026/string-ops-07.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, anton);
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}

20231026/string-ops-08.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, "Antonius, genannt Toni oder Anton");
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}

20231026/string-ops-09.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-  char *toni = "Antonius, genannt Toni oder Anton";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, toni);
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}

20231026/string-ops-10.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-  char *toni = "Antonius!!";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, toni);
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}

20231026/string-ops-11.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-  char *toni = "Antonius!";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, toni);
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}

20231026/string-ops-11.s

-	.file	"string-ops-11.c"
-	.text
-	.section	.rodata.str1.1,"aMS",@progbits,1
-.LC0:
-	.string	"%d\n"
-.LC1:
-	.string	"Anton"
-	.text
-	.globl	main
-	.type	main, @function
-main:
-.LFB11:
-	.cfi_startproc
-	pushq	%rbx
-	.cfi_def_cfa_offset 16
-	.cfi_offset 3, -16
-	subq	$16, %rsp
-	.cfi_def_cfa_offset 32
-	movl	$-1, %esi
-	leaq	.LC0(%rip), %rbx
-	movq	%rbx, %rdi
-	movl	$0, %eax
-	call	printf@PLT
-	movl	$1, %esi                      ; #include <stdio.h>
-	movq	%rbx, %rdi                    ; #include <string.h>
-	movl	$0, %eax                      ; 
-	call	printf@PLT                    ; int main (void)
-	movl	$0, %esi                      ; {
-	movq	%rbx, %rdi                    ;   char *zacharias = "Zacha";
-	movl	$0, %eax                      ;   char *anton = "Anton";
-	call	printf@PLT                    ;   char *toni = "Antonius!";
-	movl	$1700951368, 9(%rsp)          ; 
-	movl	$2126437, 12(%rsp)            ;   printf ("%d\n", strcmp (anton, zacharias));
-	leaq	9(%rsp), %rbx                 ;   printf ("%d\n", strcmp (zacharias, anton));
-	movq	%rbx, %rdi                    ;   printf ("%d\n", strcmp (anton, anton));
-	call	strlen@PLT                    ; 
-	addq	%rbx, %rax                    ;   char buffer[] = "Huber ";
-	movabsq	$8319671809674079809, %rdx    ;   strcat (buffer, toni);
-	movq	%rdx, (%rax)                  ;   printf ("%s\n", buffer);
-	movw	$33, 8(%rax)                  ;   printf ("%s\n", anton);
-	movq	%rbx, %rdi                    ; 
-	call	puts@PLT                      ;   return 0;
-	leaq	.LC1(%rip), %rdi              ; }
-	call	puts@PLT
-	movl	$0, %eax
-	addq	$16, %rsp
-	.cfi_def_cfa_offset 16
-	popq	%rbx
-	.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

20231026/string-ops-12.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *zacharias = "Zacha";
-  char *anton = "Anton";
-  char *toni = "Toni";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char buffer[] = "Huber ";
-  strcat (buffer, toni);
-  printf ("%s\n", buffer);
-  printf ("%s\n", anton);
-
-  return 0;
-}