/* ------------------------------------------------------ */
/* PROGRAM game of life :*/
/*This is a finite implementation of John H. Conway's */
/* Game of Life. Refere to my book for detail please.*/
/**/
/* Copyright Ching-Kuang Shene July/25/1989 */
/* ------------------------------------------------------ */
#include <stdio.h>
#include <stdlib.h>
#define MAXSIZE 50 /* board size */
#define OCCUPIED 1 /* occupied flag*/
#define UNOCCUPIED0
#define YES 1
#define NO0
char cell[MAXSIZE][MAXSIZE] /* the board */
char workcopy[MAXSIZE][MAXSIZE] /* a working copy */
int row /* No. of rows you want */
int column/* no. of columns you want */
int generations /* maximum no. of generation*/
/* ------------------------------------------------------ */
/* FUNCTION read_in :*/
/*This function reads in the number of generations, */
/* the number of rows, the number of columns and finally */
/* the initial configuration (the generation 0). Then put*/
/* your configuration to the center of the board. */
/* ------------------------------------------------------ */
void read_in(void)
{
int max_row, max_col /* max # of row and col.*/
int col_gap, row_gap /* incremnet of row and col */
int i, j
char line[100]
gets(line) /* read in gens, row and col*/
sscanf(line, "%d%d%d", &generations, &row, &column)
for (i = 0i <rowi++)/* clear the board */
for (j = 0j <columnj++)
cell[i][j] = UNOCCUPIED
max_col = 0/* read in the config. */
for (max_row = 0gets(line) != NULLmax_row++) {
for (i = 0line[i] != '\0'i++)
if (line[i] != ' ')
cell[max_row][i] = OCCUPIED
max_col = (max_col <i) ? i : max_col
}
row_gap = (row - max_row)/2 /* the moving gap*/
col_gap = (column - max_col)/2
for (i = max_row + row_gap - 1i >= row_gapi--) {
for (j = max_col + col_gap - 1j >= col_gapj--)
cell[i][j] = cell[i-row_gap][j-col_gap]
for ( j >= 0j--)
cell[i][j] = UNOCCUPIED
}
for ( i >= 0i--)
for (j = 0j <columnj++)
cell[i][j] = UNOCCUPIED
}
/* ------------------------------------------------------ */
/* FUNCTION display :*/
/*Display the board. */
/* ------------------------------------------------------ */
#define DRAW_BOARDER(n) { int i \
printf("\n+") \
for (i = 0i <ni++) \
printf("-")\
printf("+") \
}
void display(int gen_no)
{
int i, j
if (gen_no == 0)
printf("\n\nInitial Generation :\n")
else
printf("\n\nGeneration %d :\n", gen_no)
DRAW_BOARDER(column)
for (i = 0i <rowi++) {
printf("\n|")
for (j = 0j <columnj++)
printf("%c", (cell[i][j] == OCCUPIED) ? '*' : ' ')
printf("|")
}
DRAW_BOARDER(column)
}
/* ------------------------------------------------------ */
/* FUNCTION game_of_life : */
/*This is the main function of Game of Life. */
/* ------------------------------------------------------ */
void game_of_life(void)
{
int stable/* stable flag */
int iter /* iteration count */
int top, bottom, left, right/* neighborhood bound */
int neighbors /* # of neighbors */
int cell_count/* # of cells count */
int done
int i, j, p, q
display(0) /* display initial config. */
done = NO
for (iter = 1iter <= generations &&!doneiter++) {
memmove(workcopy, cell, MAXSIZE*MAXSIZE)/*copy*/
stable = YES /* assume it is in stable */
cell_count = 0/* # of survived cells = 0 */
for (i = 0i <rowi++) { /* scan each cell...*/
top= (i == 0) ? 0 : i - 1
bottom = (i == row - 1) ? row-1 : i + 1
for (j = 0j <columnj++) {
left = (j == 0) ? 0 : j - 1
right = (j == column - 1) ? column-1 : j + 1
/* compute number of neighbors*/
neighbors = 0
for (p = topp <= bottomp++)
for (q = leftq <= rightq++)
neighbors += workcopy[p][q]
neighbors -= workcopy[i][j]
/* determine life or dead */
if (workcopy[i][j] == OCCUPIED)
if (neighbors == 2 || neighbors == 3) {
cell[i][j] = OCCUPIED
cell_count++
}
else
cell[i][j] = UNOCCUPIED
else if (neighbors == 3) {
cell[i][j] = OCCUPIED
cell_count++
}
else
cell[i][j] = UNOCCUPIED
stable = stable &&(workcopy[i][j] == cell[i][j])
}
}
if (cell_count == 0) {
printf("\n\nAll cells die out.")
done = YES
}
else if (stable) {
printf("\n\nSystem enters a stable state.")
done = YES
}
else
display(iter)
}
}
/* ------------------------------------------------------ */
void main(void)
{
read_in()
game_of_life()
}
