jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 1 | /* |
| 2 | * 3-D gear wheels. This program is in the public domain. |
| 3 | * |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 4 | * Command line options: |
| 5 | * -info print GL implementation information |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 6 | * -exit automatically exit after 30 seconds |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 7 | * |
| 8 | * |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 9 | * Brian Paul |
| 10 | */ |
| 11 | |
| 12 | /* Conversion to GLUT by Mark J. Kilgard */ |
| 13 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 14 | |
| 15 | |
| 16 | #include <math.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <stdio.h> |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 19 | #include <string.h> |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 20 | #include <GL/glut.h> |
| 21 | |
| 22 | #ifndef M_PI |
| 23 | #define M_PI 3.14159265 |
| 24 | #endif |
| 25 | |
| 26 | static GLint T0 = 0; |
| 27 | static GLint Frames = 0; |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 28 | static GLint autoexit = 0; |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 29 | static GLint win = 0; |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 30 | static GLboolean Visible = GL_TRUE; |
| 31 | static GLboolean Animate = GL_TRUE; |
| 32 | static GLfloat viewDist = 40.0; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 33 | |
Brian Paul | a00c591 | 2005-01-09 17:50:27 +0000 | [diff] [blame] | 34 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 35 | /** |
| 36 | |
| 37 | Draw a gear wheel. You'll probably want to call this function when |
| 38 | building a display list since we do a lot of trig here. |
| 39 | |
| 40 | Input: inner_radius - radius of hole at center |
| 41 | outer_radius - radius at center of teeth |
| 42 | width - width of gear |
| 43 | teeth - number of teeth |
| 44 | tooth_depth - depth of tooth |
| 45 | |
| 46 | **/ |
| 47 | |
| 48 | static void |
| 49 | gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, |
| 50 | GLint teeth, GLfloat tooth_depth) |
| 51 | { |
| 52 | GLint i; |
| 53 | GLfloat r0, r1, r2; |
| 54 | GLfloat angle, da; |
| 55 | GLfloat u, v, len; |
| 56 | |
| 57 | r0 = inner_radius; |
| 58 | r1 = outer_radius - tooth_depth / 2.0; |
| 59 | r2 = outer_radius + tooth_depth / 2.0; |
| 60 | |
| 61 | da = 2.0 * M_PI / teeth / 4.0; |
| 62 | |
| 63 | glShadeModel(GL_FLAT); |
| 64 | |
| 65 | glNormal3f(0.0, 0.0, 1.0); |
| 66 | |
| 67 | /* draw front face */ |
| 68 | glBegin(GL_QUAD_STRIP); |
| 69 | for (i = 0; i <= teeth; i++) { |
| 70 | angle = i * 2.0 * M_PI / teeth; |
| 71 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 72 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 73 | if (i < teeth) { |
| 74 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 75 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 76 | } |
| 77 | } |
| 78 | glEnd(); |
| 79 | |
| 80 | /* draw front sides of teeth */ |
| 81 | glBegin(GL_QUADS); |
| 82 | da = 2.0 * M_PI / teeth / 4.0; |
| 83 | for (i = 0; i < teeth; i++) { |
| 84 | angle = i * 2.0 * M_PI / teeth; |
| 85 | |
| 86 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 87 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); |
| 88 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); |
| 89 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 90 | } |
| 91 | glEnd(); |
| 92 | |
| 93 | glNormal3f(0.0, 0.0, -1.0); |
| 94 | |
| 95 | /* draw back face */ |
| 96 | glBegin(GL_QUAD_STRIP); |
| 97 | for (i = 0; i <= teeth; i++) { |
| 98 | angle = i * 2.0 * M_PI / teeth; |
| 99 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 100 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 101 | if (i < teeth) { |
| 102 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 103 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 104 | } |
| 105 | } |
| 106 | glEnd(); |
| 107 | |
| 108 | /* draw back sides of teeth */ |
| 109 | glBegin(GL_QUADS); |
| 110 | da = 2.0 * M_PI / teeth / 4.0; |
| 111 | for (i = 0; i < teeth; i++) { |
| 112 | angle = i * 2.0 * M_PI / teeth; |
| 113 | |
| 114 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 115 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); |
| 116 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); |
| 117 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 118 | } |
| 119 | glEnd(); |
| 120 | |
| 121 | /* draw outward faces of teeth */ |
| 122 | glBegin(GL_QUAD_STRIP); |
| 123 | for (i = 0; i < teeth; i++) { |
| 124 | angle = i * 2.0 * M_PI / teeth; |
| 125 | |
| 126 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 127 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 128 | u = r2 * cos(angle + da) - r1 * cos(angle); |
| 129 | v = r2 * sin(angle + da) - r1 * sin(angle); |
| 130 | len = sqrt(u * u + v * v); |
| 131 | u /= len; |
| 132 | v /= len; |
| 133 | glNormal3f(v, -u, 0.0); |
| 134 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); |
| 135 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); |
| 136 | glNormal3f(cos(angle), sin(angle), 0.0); |
| 137 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); |
| 138 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); |
| 139 | u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da); |
| 140 | v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da); |
| 141 | glNormal3f(v, -u, 0.0); |
| 142 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 143 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 144 | glNormal3f(cos(angle), sin(angle), 0.0); |
| 145 | } |
| 146 | |
| 147 | glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5); |
| 148 | glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5); |
| 149 | |
| 150 | glEnd(); |
| 151 | |
| 152 | glShadeModel(GL_SMOOTH); |
| 153 | |
| 154 | /* draw inside radius cylinder */ |
| 155 | glBegin(GL_QUAD_STRIP); |
| 156 | for (i = 0; i <= teeth; i++) { |
| 157 | angle = i * 2.0 * M_PI / teeth; |
| 158 | glNormal3f(-cos(angle), -sin(angle), 0.0); |
| 159 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 160 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 161 | } |
| 162 | glEnd(); |
| 163 | |
| 164 | } |
| 165 | |
| 166 | static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0; |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 167 | static GLint gear1, gear2, gear3; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 168 | static GLfloat angle = 0.0; |
| 169 | |
| 170 | static void |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 171 | cleanup(void) |
| 172 | { |
| 173 | glDeleteLists(gear1, 1); |
| 174 | glDeleteLists(gear2, 1); |
| 175 | glDeleteLists(gear3, 1); |
| 176 | glutDestroyWindow(win); |
| 177 | } |
| 178 | |
| 179 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 180 | draw(void) |
| 181 | { |
| 182 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 183 | |
| 184 | glPushMatrix(); |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 185 | |
| 186 | glTranslatef(0.0, 0.0, -viewDist); |
| 187 | |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 188 | glRotatef(view_rotx, 1.0, 0.0, 0.0); |
| 189 | glRotatef(view_roty, 0.0, 1.0, 0.0); |
| 190 | glRotatef(view_rotz, 0.0, 0.0, 1.0); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 191 | |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 192 | glPushMatrix(); |
| 193 | glTranslatef(-3.0, -2.0, 0.0); |
| 194 | glRotatef(angle, 0.0, 0.0, 1.0); |
| 195 | glCallList(gear1); |
| 196 | glPopMatrix(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 197 | |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 198 | glPushMatrix(); |
| 199 | glTranslatef(3.1, -2.0, 0.0); |
| 200 | glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0); |
| 201 | glCallList(gear2); |
| 202 | glPopMatrix(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 203 | |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 204 | glPushMatrix(); |
| 205 | glTranslatef(-3.1, 4.2, 0.0); |
| 206 | glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0); |
| 207 | glCallList(gear3); |
| 208 | glPopMatrix(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 209 | |
| 210 | glPopMatrix(); |
| 211 | |
| 212 | glutSwapBuffers(); |
| 213 | |
| 214 | Frames++; |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 215 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 216 | { |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 217 | GLint t = glutGet(GLUT_ELAPSED_TIME); |
| 218 | if (t - T0 >= 5000) { |
| 219 | GLfloat seconds = (t - T0) / 1000.0; |
| 220 | GLfloat fps = Frames / seconds; |
| 221 | printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps); |
Keith Whitwell | e6479c6 | 2009-02-24 12:02:24 +0000 | [diff] [blame] | 222 | fflush(stdout); |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 223 | T0 = t; |
| 224 | Frames = 0; |
| 225 | if ((t >= 999.0 * autoexit) && (autoexit)) { |
| 226 | cleanup(); |
| 227 | exit(0); |
| 228 | } |
| 229 | } |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 230 | } |
| 231 | } |
| 232 | |
| 233 | |
| 234 | static void |
| 235 | idle(void) |
| 236 | { |
Brian Paul | a00c591 | 2005-01-09 17:50:27 +0000 | [diff] [blame] | 237 | static double t0 = -1.; |
| 238 | double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; |
| 239 | if (t0 < 0.0) |
| 240 | t0 = t; |
| 241 | dt = t - t0; |
| 242 | t0 = t; |
| 243 | |
Brian Paul | d0529b6 | 2005-09-30 15:03:33 +0000 | [diff] [blame] | 244 | angle += 70.0 * dt; /* 70 degrees per second */ |
| 245 | angle = fmod(angle, 360.0); /* prevents eventual overflow */ |
| 246 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 247 | glutPostRedisplay(); |
| 248 | } |
| 249 | |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 250 | static void |
| 251 | update_idle_func(void) |
| 252 | { |
| 253 | if (Visible && Animate) |
| 254 | glutIdleFunc(idle); |
| 255 | else |
| 256 | glutIdleFunc(NULL); |
| 257 | } |
| 258 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 259 | /* change view angle, exit upon ESC */ |
| 260 | /* ARGSUSED1 */ |
| 261 | static void |
| 262 | key(unsigned char k, int x, int y) |
| 263 | { |
| 264 | switch (k) { |
| 265 | case 'z': |
| 266 | view_rotz += 5.0; |
| 267 | break; |
| 268 | case 'Z': |
| 269 | view_rotz -= 5.0; |
| 270 | break; |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 271 | case 'd': |
| 272 | viewDist += 1.0; |
| 273 | break; |
| 274 | case 'D': |
| 275 | viewDist -= 1.0; |
| 276 | break; |
| 277 | case 'a': |
| 278 | Animate = !Animate; |
| 279 | update_idle_func(); |
| 280 | break; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 281 | case 27: /* Escape */ |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 282 | cleanup(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 283 | exit(0); |
| 284 | break; |
| 285 | default: |
| 286 | return; |
| 287 | } |
| 288 | glutPostRedisplay(); |
| 289 | } |
| 290 | |
| 291 | /* change view angle */ |
| 292 | /* ARGSUSED1 */ |
| 293 | static void |
| 294 | special(int k, int x, int y) |
| 295 | { |
| 296 | switch (k) { |
| 297 | case GLUT_KEY_UP: |
| 298 | view_rotx += 5.0; |
| 299 | break; |
| 300 | case GLUT_KEY_DOWN: |
| 301 | view_rotx -= 5.0; |
| 302 | break; |
| 303 | case GLUT_KEY_LEFT: |
| 304 | view_roty += 5.0; |
| 305 | break; |
| 306 | case GLUT_KEY_RIGHT: |
| 307 | view_roty -= 5.0; |
| 308 | break; |
| 309 | default: |
| 310 | return; |
| 311 | } |
| 312 | glutPostRedisplay(); |
| 313 | } |
| 314 | |
| 315 | /* new window size or exposure */ |
| 316 | static void |
| 317 | reshape(int width, int height) |
| 318 | { |
| 319 | GLfloat h = (GLfloat) height / (GLfloat) width; |
| 320 | |
| 321 | glViewport(0, 0, (GLint) width, (GLint) height); |
| 322 | glMatrixMode(GL_PROJECTION); |
| 323 | glLoadIdentity(); |
Brian | f09b238 | 2008-01-28 12:41:47 -0700 | [diff] [blame] | 324 | glFrustum(-1.0, 1.0, -h, h, 5.0, 200.0); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 325 | glMatrixMode(GL_MODELVIEW); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | static void |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 329 | init(int argc, char *argv[]) |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 330 | { |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 331 | static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0}; |
| 332 | static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0}; |
| 333 | static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0}; |
| 334 | static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0}; |
| 335 | GLint i; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 336 | |
| 337 | glLightfv(GL_LIGHT0, GL_POSITION, pos); |
| 338 | glEnable(GL_CULL_FACE); |
| 339 | glEnable(GL_LIGHTING); |
| 340 | glEnable(GL_LIGHT0); |
| 341 | glEnable(GL_DEPTH_TEST); |
| 342 | |
| 343 | /* make the gears */ |
| 344 | gear1 = glGenLists(1); |
| 345 | glNewList(gear1, GL_COMPILE); |
| 346 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); |
| 347 | gear(1.0, 4.0, 1.0, 20, 0.7); |
| 348 | glEndList(); |
| 349 | |
| 350 | gear2 = glGenLists(1); |
| 351 | glNewList(gear2, GL_COMPILE); |
| 352 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); |
| 353 | gear(0.5, 2.0, 2.0, 10, 0.7); |
| 354 | glEndList(); |
| 355 | |
| 356 | gear3 = glGenLists(1); |
| 357 | glNewList(gear3, GL_COMPILE); |
| 358 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); |
| 359 | gear(1.3, 2.0, 0.5, 10, 0.7); |
| 360 | glEndList(); |
| 361 | |
| 362 | glEnable(GL_NORMALIZE); |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 363 | |
Brian Paul | 1e35590 | 2000-03-29 23:57:20 +0000 | [diff] [blame] | 364 | for ( i=1; i<argc; i++ ) { |
| 365 | if (strcmp(argv[i], "-info")==0) { |
| 366 | printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| 367 | printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| 368 | printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); |
| 369 | printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS)); |
| 370 | } |
| 371 | else if ( strcmp(argv[i], "-exit")==0) { |
| 372 | autoexit = 30; |
| 373 | printf("Auto Exit after %i seconds.\n", autoexit ); |
| 374 | } |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 375 | } |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 376 | } |
| 377 | |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 378 | |
Brian Paul | 3cd7738 | 2000-04-06 02:22:59 +0000 | [diff] [blame] | 379 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 380 | visible(int vis) |
| 381 | { |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 382 | Visible = vis; |
| 383 | update_idle_func(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | int main(int argc, char *argv[]) |
| 387 | { |
Brian Paul | 263f432 | 2009-12-18 08:12:55 -0700 | [diff] [blame] | 388 | glutInitWindowSize(300, 300); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 389 | glutInit(&argc, argv); |
| 390 | glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); |
Brian Paul | a1a6fa2 | 2005-08-09 15:13:32 +0000 | [diff] [blame] | 391 | win = glutCreateWindow("Gears"); |
Brian Paul | ac12609 | 1999-10-21 16:39:06 +0000 | [diff] [blame] | 392 | init(argc, argv); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 393 | |
| 394 | glutDisplayFunc(draw); |
| 395 | glutReshapeFunc(reshape); |
| 396 | glutKeyboardFunc(key); |
| 397 | glutSpecialFunc(special); |
| 398 | glutVisibilityFunc(visible); |
Brian | e7007c6 | 2008-01-28 12:35:20 -0700 | [diff] [blame] | 399 | update_idle_func(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 400 | |
| 401 | glutMainLoop(); |
| 402 | return 0; /* ANSI C requires main to return int. */ |
| 403 | } |