Beispiele und Screenshot 14.11.2024

20241114/arrays-01.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[15] = { 2, 3, 5, 7, 11, 0 };
+  for (int *p = prime; *p; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/arrays-02.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[5] = { 2, 3, 5, 7, 11, 0 };
+  for (int *p = prime; *p; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/arrays-03.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[15] = { 2, 3, 5, 7, 11, 0, [14] 13 };
+  for (int *p = prime; p < prime + 15; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/arrays-04.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[15] = {};
+  for (int *p = prime; p < prime + 15; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/arrays-04.s

+	.file	"arrays-04.c"
+	.text
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"%d\n"
+	.section	.text.startup,"ax",@progbits
+	.p2align 4
+	.globl	main
+	.type	main, @function
+main:
+.LFB11:
+	.cfi_startproc
+	pushq	%r12
+	.cfi_def_cfa_offset 16
+	.cfi_offset 12, -16
+	pxor	%xmm0, %xmm0
+	leaq	.LC0(%rip), %r12
+	pushq	%rbp
+	.cfi_def_cfa_offset 24
+	.cfi_offset 6, -24
+	pushq	%rbx
+	.cfi_def_cfa_offset 32
+	.cfi_offset 3, -32
+	subq	$64, %rsp
+	.cfi_def_cfa_offset 96                ; #include <stdio.h>
+	movaps	%xmm0, 32(%rsp)               ; 
+	movq	%rsp, %rbx                    ; int main (void)
+	leaq	60(%rsp), %rbp                ; {
+	movaps	%xmm0, (%rsp)                 ;   int prime[15] = {};
+	movaps	%xmm0, 16(%rsp)               ;   for (int *p = prime; p < prime + 15; p++)
+	movups	%xmm0, 44(%rsp)               ;     printf ("%d\n", *p);
+	.p2align 4,,10                        ;   return 0;
+	.p2align 3                            ; }
+.L2:
+	movl	(%rbx), %esi
+	movq	%r12, %rdi
+	xorl	%eax, %eax
+	addq	$4, %rbx
+	call	printf@PLT
+	cmpq	%rbp, %rbx
+	jne	.L2
+	addq	$64, %rsp
+	.cfi_def_cfa_offset 32
+	xorl	%eax, %eax
+	popq	%rbx
+	.cfi_def_cfa_offset 24
+	popq	%rbp
+	.cfi_def_cfa_offset 16
+	popq	%r12
+	.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

20241114/arrays-05.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[15];  /* FALSCH: Array wird nicht initalisiert, aber ausgegeben! */
+  for (int *p = prime; p < prime + 15; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/arrays-05.s

+	.file	"arrays-05.c"
+	.text
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"%d\n"
+	.section	.text.startup,"ax",@progbits
+	.p2align 4
+	.globl	main
+	.type	main, @function
+main:
+.LFB11:
+	.cfi_startproc
+	pushq	%r12
+	.cfi_def_cfa_offset 16
+	.cfi_offset 12, -16
+	leaq	.LC0(%rip), %r12
+	pushq	%rbp
+	.cfi_def_cfa_offset 24
+	.cfi_offset 6, -24
+	pushq	%rbx
+	.cfi_def_cfa_offset 32
+	.cfi_offset 3, -32
+	subq	$64, %rsp
+	.cfi_def_cfa_offset 96
+	movq	%rsp, %rbx                    ; #include <stdio.h>
+	leaq	60(%rsp), %rbp                ; 
+	.p2align 4,,10                        ; int main (void)
+	.p2align 3                            ; {
+.L2:                                          ;   int prime[15];
+	movl	(%rbx), %esi                  ;   for (int *p = prime; p < prime + 15; p++)
+	movq	%r12, %rdi                    ;     printf ("%d\n", *p);
+	xorl	%eax, %eax                    ;   return 0;
+	addq	$4, %rbx                      ; }
+	call	printf@PLT
+	cmpq	%rbp, %rbx
+	jne	.L2
+	addq	$64, %rsp
+	.cfi_def_cfa_offset 32
+	xorl	%eax, %eax
+	popq	%rbx
+	.cfi_def_cfa_offset 24
+	popq	%rbp
+	.cfi_def_cfa_offset 16
+	popq	%r12
+	.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

20241114/arrays-06.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime;
+  printf ("%d\n", prime);
+  return 0;
+}

20241114/arrays-07.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[15] = {1};
+  for (int *p = prime; p < prime + 15; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20241114/strings-01.c

+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%d", *p);
+  return 0;
+}

20241114/strings-02.c

+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}

20241114/strings-03.c

+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}

20241114/strings-04.c

+#include <stdio.h>
+
+int main (void)
+{
+  char *hello = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}

20241114/strings-05.c

+#include <stdio.h>
+
+int main (void)
+{
+  char x[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  char *hello = x;
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}

20241114/strings-06.c

+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  printf ("%s", hello);
+  return 0;
+}

20241114/strings-07.c

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

20241114/strings-08.c

+#include <stdio.h>
+
+int main (void)
+{
+  char *hello = "Hello, world!\n";
+  printf ("%s", hello);
+  return 0;
+}

20241114/strings-09-10.txt

+cassini/home/peter/bo/2024ws/hp/20241114> cat strings-09.c
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello!\n";
+  hello[1] = 'a';
+  printf ("%s", hello);
+  return 0;
+}
+cassini/home/peter/bo/2024ws/hp/20241114> gcc -Wall -O strings-09.c -o strings-09
+cassini/home/peter/bo/2024ws/hp/20241114> ./strings-09
+Hallo!
+cassini/home/peter/bo/2024ws/hp/20241114> cat strings-10.c
+#include <stdio.h>
+
+int main (void)
+{
+  char *hello = "Hello!\n";
+  hello[1] = 'a';
+  printf ("%s", hello);
+  return 0;
+}
+cassini/home/peter/bo/2024ws/hp/20241114> gcc -Wall -O strings-10.c -o strings-10
+cassini/home/peter/bo/2024ws/hp/20241114> ./strings-10
+Speicherzugriffsfehler
+cassini/home/peter/bo/2024ws/hp/20241114>

20241114/strings-09.c

+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello!\n";
+  hello[1] = 'a';
+  printf ("%s", hello);
+  return 0;
+}

20241114/strings-10.c

+#include <stdio.h>
+
+int main (void)
+{
+  char *hello = "Hello!\n";
+  hello[1] = 'a';
+  printf ("%s", hello);
+  return 0;
+}