Beispiele 12.10.2023

20231012/arrays-01.c

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

20231012/arrays-02.c

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

20231012/arrays-03.c

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

20231012/arrays-04.c

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

20231012/arrays-05.c

+#include <stdio.h>
+
+int main (void)
+{
+  int prime[6] = { 2, 3, 5, 7, 11, 0 };
+  for (int *p = prime; *p; p++)
+    printf ("%d\n", *p);
+  return 0;
+}

20231012/arrays-06.c

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

20231012/functions-01.c

+int main (void)
+{
+  return 0;
+}

20231012/functions-02.c

+int main (void)
+{
+  return 42;
+}

20231012/functions-03.c

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

20231012/functions-04.c

+#include <stdio.h>
+
+void hello ()
+{
+  printf ("Hello, world!\n");
+}
+
+int main ()
+{
+  hello (42);
+  return 0;
+}

20231012/functions-05.c

+#include <stdio.h>
+
+void hello (void)
+{
+  printf ("Hello, world!\n");
+}
+
+int main (void)
+{
+  hello (42);
+  return 0;
+}

20231012/functions-06.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);
+  return 0;
+
+  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;
+}

20231012/functions-07.c

+#include <stdio.h>
+
+int a;  /* bekommt den Wert 0, weil global */
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;  /* bekäme ohne Initialisierung einen Phantasie-Wert */
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  return 0;
+
+  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;
+}

20231012/functions-08.c

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

20231012/functions-09.c

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

20231012/functions-10.c

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

20231012/functions-11.c

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

20231012/functions-12.c

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

20231012/goto-01.c

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

20231012/goto-02.c

+#include <stdio.h>
+
+int main (void)
+{
+  int i = 0;
+loop:
+  if (i >= 10)
+    goto endloop;
+  printf ("%d\n", i++);
+  goto loop;
+  int a = 42;
+endloop:
+  printf ("The answer is: %d\n", a);
+  return 0;
+}