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Use backtick code blocks for syntax highlighting

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James Gregory 2013-12-31 11:38:48 +11:00
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18-04.md
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@ -12,155 +12,161 @@ pages: 361-365
**LISTING 18.3 MAIN.C**
// MAIN.C
//
// David Stafford
//
```c
// MAIN.C
//
// David Stafford
//
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <time.h>
#include <bios.h>
#include "life.h"
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <time.h>
#include <bios.h>
#include "life.h"
// functions in VIDEO.C
void enter_display_mode( void );
void exit_display_mode( void );
void show_text( int x, int y, char *text );
// functions in VIDEO.C
void enter_display_mode( void );
void exit_display_mode( void );
void show_text( int x, int y, char *text );
void InitCellmap( void )
void InitCellmap( void )
{
unsigned int i, j, t, x, y, init;
for( init = (HEIGHT * WIDTH * 3) / 2; init; init— )
{
x = random( WIDTH * 3 );
y = random( HEIGHT );
CellMap[ (y * WIDTH) + x / 3 ] |= 0x1000 << (2 - (x % 3));
}
for( i = j = 0; i < WIDTH * HEIGHT; i++ )
{
if( CellMap[ i ] & 0x7000 )
{
unsigned int i, j, t, x, y, init;
for( init = (HEIGHT * WIDTH * 3) / 2; init; init— )
{
x = random( WIDTH * 3 );
y = random( HEIGHT );
CellMap[ (y * WIDTH) + x / 3 ] |= 0x1000 << (2 - (x % 3));
}
for( i = j = 0; i < WIDTH * HEIGHT; i++ )
{
if( CellMap[ i ] & 0x7000 )
{
ChangeList1[ j++ ] = (short)&CellMap[ i ];
}
}
NextGen(); // Set cell states, prime the pump.
ChangeList1[ j++ ] = (short)&CellMap[ i ];
}
}
void main( void )
{
unsigned long generation = 0;
char gen_text[ 80 ];
long start_time, end_time;
unsigned int seed;
NextGen(); // Set cell states, prime the pump.
}
printf( "Seed (0 for random seed): " );
scanf( "%d", &seed );
if( seed == 0 ) seed = (unsigned) time(NULL);
srand( seed );
void main( void )
{
unsigned long generation = 0;
char gen_text[ 80 ];
long start_time, end_time;
unsigned int seed;
#ifndef NODRAW
enter_display_mode();
show_text( 0, 10, "Generation:" );
#endif
printf( "Seed (0 for random seed): " );
scanf( "%d", &seed );
if( seed == 0 ) seed = (unsigned) time(NULL);
srand( seed );
InitCellmap(); // randomly initialize cell map
#ifndef NODRAW
enter_display_mode();
show_text( 0, 10, "Generation:" );
#endif
_bios_timeofday( _TIME_GETCLOCK, &start_time );
InitCellmap(); // randomly initialize cell map
do
{
NextGen();
generation++;
_bios_timeofday( _TIME_GETCLOCK, &start_time );
#ifndef NOCOUNTER
sprintf( gen_text, "%10lu", generation );
show_text( 0, 12, gen_text );
#endif
}
#ifdef GEN
while( generation < GEN );
#else
while( !kbhit() );
#endif
do
{
NextGen();
generation++;
_bios_timeofday( _TIME_GETCLOCK, &end_time );
end_time -= start_time;
#ifndef NOCOUNTER
sprintf( gen_text, "%10lu", generation );
show_text( 0, 12, gen_text );
#endif
}
#ifdef GEN
while( generation < GEN );
#else
while( !kbhit() );
#endif
#ifndef NODRAW
getch(); // clear keypress
exit_display_mode();
#endif
_bios_timeofday( _TIME_GETCLOCK, &end_time );
end_time -= start_time;
printf( "Total generations: %ld\nSeed: %u\n", generation, seed );
printf( "%ld ticks\n", end_time );
printf( "Time: %f generations/second\n",
(double)generation / (double)end_time * 18.2 );
}
#ifndef NODRAW
getch(); // clear keypress
exit_display_mode();
#endif
printf( "Total generations: %ld\nSeed: %u\n", generation, seed );
printf( "%ld ticks\n", end_time );
printf( "Time: %f generations/second\n",
(double)generation / (double)end_time * 18.2 );
}
```
**LISTING 18.4 VIDEO.C**
/* VGA mode 13h functions for Game of Life.
Tested with Borland C++. */
#include <stdio.h>
#include <conio.h>
#include <dos.h>
```c
/* VGA mode 13h functions for Game of Life.
Tested with Borland C++. */
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#define TEXT_X_OFFSET 28
#define SCREEN_WIDTH_IN_BYTES 320
#define TEXT_X_OFFSET 28
#define SCREEN_WIDTH_IN_BYTES 320
#define SCREEN_SEGMENT 0xA000
#define SCREEN_SEGMENT 0xA000
/* Mode 13h mode-set function. */
void enter_display_mode()
{
union REGS regset;
/* Mode 13h mode-set function. */
void enter_display_mode()
{
union REGS regset;
regset.x.ax = 0x0013;
int86(0x10, &regset, &regset);
}
regset.x.ax = 0x0013;
int86(0x10, &regset, &regset);
}
/* Text mode mode-set function. */
void exit_display_mode()
{
union REGS regset;
/* Text mode mode-set function. */
void exit_display_mode()
{
union REGS regset;
regset.x.ax = 0x0003;
int86(0x10, &regset, &regset);
}
regset.x.ax = 0x0003;
int86(0x10, &regset, &regset);
}
/* Text display function. Offsets text to non-graphics area of
screen. */
void show_text(int x, int y, char *text)
{
gotoxy(TEXT_X_OFFSET + x, y);
puts(text);
}
/* Text display function. Offsets text to non-graphics area of
screen. */
void show_text(int x, int y, char *text)
{
gotoxy(TEXT_X_OFFSET + x, y);
puts(text);
}
```
**LISTING 18.5 LIFE.H**
void far NextGen( void );
```c
void far NextGen( void );
extern unsigned short CellMap[];
extern unsigned short far ChangeList1[];
extern unsigned short CellMap[];
extern unsigned short far ChangeList1[];
#define LEFT (-2)
#define RIGHT (+2)
#define UP (WIDTH * LEFT)
#define DOWN (WIDTH * RIGHT)
#define UPPERLEFT (UP + LEFT)
#define UPPERRIGHT (UP + RIGHT)
#define LOWERLEFT (DOWN + LEFT)
#define LOWERRIGHT (DOWN + RIGHT)
#define WRAPLEFT (RIGHT * (WIDTH - 1))
#define WRAPRIGHT (LEFT * (WIDTH - 1))
#define WRAPUP (DOWN * (HEIGHT - 1))
#define WRAPDOWN (UP * (HEIGHT - 1))
#define LEFT (-2)
#define RIGHT (+2)
#define UP (WIDTH * LEFT)
#define DOWN (WIDTH * RIGHT)
#define UPPERLEFT (UP + LEFT)
#define UPPERRIGHT (UP + RIGHT)
#define LOWERLEFT (DOWN + LEFT)
#define LOWERRIGHT (DOWN + RIGHT)
#define WRAPLEFT (RIGHT * (WIDTH - 1))
#define WRAPRIGHT (LEFT * (WIDTH - 1))
#define WRAPUP (DOWN * (HEIGHT - 1))
#define WRAPDOWN (UP * (HEIGHT - 1))
```
### Keeping Track of Change with a Change List {#Heading5}