Beispielprogramme 6.11.2017

20171106/answer.c

+#include "answer.h"
+
+int answer (void)
+{
+  return 23;
+}

20171106/answer.h

+extern int answer (void);

20171106/cube-1.c

+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "opengl-magic.h"
+
+void draw (void)
+{
+  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);
+  set_material_color (1.0, 0.7, 0.0);
+  glutSolidCube (0.75);
+  glFlush ();
+  glutSwapBuffers ();
+}
+
+int main (int argc, char **argv)
+{
+  init_opengl (&argc, argv, "Cube");
+  glutDisplayFunc (draw);
+  glutMainLoop ();
+  return 0;
+}

20171106/cube-2.c

+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "opengl-magic.h"
+
+void draw (void)
+{
+  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);
+  set_material_color (1.0, 0.7, 0.0);
+  glRotatef (-30.0, 0.5, 1.0, 0.0);
+  glutSolidCube (0.75);
+  glFlush ();
+  glutSwapBuffers ();
+}
+
+int main (int argc, char **argv)
+{
+  init_opengl (&argc, argv, "Cube");
+  glutDisplayFunc (draw);
+  glutMainLoop ();
+  return 0;
+}

20171106/cube-3.c

+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "opengl-magic.h"
+
+float t = 0.0;
+
+void draw (void)
+{
+  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  set_material_color (1.0, 0.7, 0.0);
+  glRotatef (t, 0.5, 1.0, 0.0);
+  glutSolidCube (0.5);
+  glFlush ();
+  glutSwapBuffers ();
+}
+
+void timer_handler (int value)
+{
+  t += 0.05;
+  glutPostRedisplay ();
+  glutTimerFunc (50, timer_handler, 0);
+}
+
+int main (int argc, char **argv)
+{
+  init_opengl (&argc, argv, "Cube");
+  glutDisplayFunc (draw);
+  glutTimerFunc (50, timer_handler, 0);
+  glutMainLoop ();
+  return 0;
+}

20171106/cube-4.c

+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "opengl-magic.h"
+
+float t = 0.0;
+
+void draw (void)
+{
+  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  set_material_color (1.0, 0.7, 0.0);
+  glPushMatrix ();
+  glRotatef (t, 0.5, 1.0, 0.0);
+  glutSolidCube (0.5);
+  glPopMatrix ();
+  glFlush ();
+  glutSwapBuffers ();
+}
+
+void timer_handler (int value)
+{
+  t += 0.05;
+  glutPostRedisplay ();
+  glutTimerFunc (50, timer_handler, 0);
+}
+
+int main (int argc, char **argv)
+{
+  init_opengl (&argc, argv, "Cube");
+  glutDisplayFunc (draw);
+  glutTimerFunc (50, timer_handler, 0);
+  glutMainLoop ();
+  return 0;
+}

20171106/cube-5.c

+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "opengl-magic.h"
+
+float t = 0.0;
+
+void draw (void)
+{
+  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  set_material_color (1.0, 0.7, 0.0);
+  glPushMatrix ();
+  glRotatef (20.0 * t, 0.5, 1.0, 0.0);
+  glutSolidCube (0.5);
+  glPopMatrix ();
+  glFlush ();
+  glutSwapBuffers ();
+}
+
+void timer_handler (int value)
+{
+  t += 0.05;
+  glutPostRedisplay ();
+  glutTimerFunc (50, timer_handler, 0);
+}
+
+int main (int argc, char **argv)
+{
+  init_opengl (&argc, argv, "Cube");
+  glutDisplayFunc (draw);
+  glutTimerFunc (50, timer_handler, 0);
+  glutMainLoop ();
+  return 0;
+}

20171106/hello-1.c

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

20171106/hello-2.c

+extern int printf (const char *__restrict __format, ...);
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}

20171106/hello-3.c

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

20171106/hexe.h

+eine kleine Hexe.

20171106/maerchen.c

+Vor langer, langer Zeit
+gab es einmal
+#include "hexe.h"
+Die lebte in einem Wald.

20171106/philosophy.c

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

20171106/stdio.h

+extern int printf (const char *__restrict __format, ...);