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#include <stdio.h>
#define WIDTH 213
#define HEIGHT 56
#define F_ARGS _Bool board[HEIGHT][WIDTH], int neighbours[HEIGHT][WIDTH], int y, int x
int get_neighbours(_Bool board[HEIGHT][WIDTH], int y, int x)
{
int neighbours = 0;
if(y > 0)
{
if(board[y - 1][x]) ++neighbours; // n
if((x + 1) < WIDTH && board[y - 1][x + 1]) ++neighbours; // ne
if( x > 0 && board[y - 1][x - 1]) ++neighbours; // nw
}
if((x + 1) < WIDTH && board[y][x + 1]) ++neighbours; // e
if( x > 0 && board[y][x - 1]) ++neighbours; // w
if((y + 1) < HEIGHT)
{
if(board[y + 1][x]) ++neighbours; // s
if((x + 1) < WIDTH && board[y + 1][x + 1]) ++neighbours; // se
if( x > 0 && board[y + 1][x - 1]) ++neighbours; // sw
}
return neighbours;
}
void iter(void (*f)(F_ARGS), _Bool board[HEIGHT][WIDTH], int neighbours[HEIGHT][WIDTH])
{
for(int y = 0; y < HEIGHT; ++y)
{
for(int x = 0; x < WIDTH; ++x)
{
(*f)(board, neighbours, y, x);
}
}
}
void print_board_pos(F_ARGS)
{
board[y][x] ? putc('*', stdout) : putc('.', stdout);
if(x + 1 == WIDTH)
putc('\n', stdout);
}
void calculate_neighbours(F_ARGS)
{
neighbours[y][x] = get_neighbours(board, y, x);
}
void apply_rules(F_ARGS)
{
if(neighbours[y][x] < 2 || neighbours[y][x] > 3)
{
board[y][x] = 0;
}
else if(neighbours[y][x] == 3)
{
board[y][x] = 1;
}
}
int handle_input(int input)
{
switch(input)
{
case 'q':
return 0;
default:
return 1;
}
}
int main(void)
{
_Bool board[HEIGHT][WIDTH] = { 0 };
int neighbours[HEIGHT][WIDTH] = { 0 };
board[0][1] = 1;
board[1][2] = 1;
board[2][0] = 1;
board[2][1] = 1;
board[2][2] = 1;
iter(&print_board_pos, board, neighbours);
int input = getchar();
_Bool run = handle_input(input);
while(run)
{
iter(&calculate_neighbours, board, neighbours);
iter(&apply_rules, board, neighbours);
iter(&print_board_pos, board, neighbours);
input = getchar();
run = handle_input(input);
}
return 0;
}
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