Weitere Beispiele 17.10.2019

20191017/comma-1.c

+#include <stdio.h>
+
+int main (void)
+{
+  double pi;
+  pi = 3,1415;
+  printf ("pi = %lf\n", pi);
+  return 0;
+}

20191017/comma-2.c

+#include <stdio.h>
+
+int main (void)
+{
+  double pi;
+  pi = (3,1415);
+  printf ("pi = %lf\n", pi);
+  return 0;
+}

20191017/comma-3.c

+#include <stdio.h>
+
+int main (void)
+{
+  for (int i = 1; i < 10; printf ("%d\n", i), i++);
+  return 0;
+}

20191017/functions-1.c

+#include <stdio.h>
+
+int a, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+/*
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-2.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+/*
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-3.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+/*
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-4.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+/*
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-5.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+/*
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-6.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a, b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+/*
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-7.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+/*
+  printf ("main(): a = %d, b = %d\n", a, b);
+*/
+  return 0;
+}

20191017/functions-8.c

+#include <stdio.h>
+
+int a = 0, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}

20191017/functions-8.s

+	.file	"functions-8.c"
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"foo(): a = %d, b = %d\n"
+	.text
+	.globl	foo
+	.type	foo, @function
+foo:
+.LFB11:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	addl	$1, b(%rip)
+	movl	$7, %edx
+	movl	a.2249(%rip), %esi
+	leaq	.LC0(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	addl	$1, a.2249(%rip)
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	foo, .-foo
+	.section	.rodata.str1.1
+.LC1:
+	.string	"main(): a = %d, b = %d\n"
+	.text
+	.globl	main
+	.type	main, @function
+main:
+.LFB12:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	movl	b(%rip), %edx
+	movl	a(%rip), %esi
+	leaq	.LC1(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	call	foo
+	movl	b(%rip), %edx
+	movl	a(%rip), %esi
+	leaq	.LC1(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	movl	$12, b(%rip)
+	movl	$12, a(%rip)
+	movl	$12, %edx
+	movl	$12, %esi
+	leaq	.LC1(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	call	foo
+	movl	b(%rip), %edx
+	movl	a(%rip), %esi
+	leaq	.LC1(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	movl	$0, %eax
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE12:
+	.size	main, .-main
+	.data
+	.align 4
+	.type	a.2249, @object
+	.size	a.2249, 4
+a.2249:
+	.long	5
+	.globl	b
+	.align 4
+	.type	b, @object
+	.size	b, 4
+b:
+	.long	3
+	.globl	a
+	.bss
+	.align 4
+	.type	a, @object
+	.size	a, 4
+a:
+	.zero	4
+	.ident	"GCC: (Debian 6.3.0-18+deb9u1) 6.3.0 20170516"
+	.section	.note.GNU-stack,"",@progbits

20191017/hp-20191017.tex

@@ -888,7 +888,7 @@
       \item
         {\only<2->{\color{red}}Zuweisung}: \lstinline{= += -= *= /= %=}
       \item
-        Ignorieren: \lstinline{,}
+        Ignorieren: \lstinline{,}\quad \lstinline{a, b}: berechne \lstinline{a}, ignoriere es, nimm stattdessen \lstinline{b}
     \end{itemize}
     \pause
     \medskip

20191017/main-1.c

+#include <stdio.h>
+
+void main ()
+{
+  printf ("Hello, world!\n");
+}