[2010-01] experimenting with 1d life, led to my old logo/avatar

lifebyte.c

//&>/dev/null;x="${0%.*}";[ ! "$x" -ot "$0" ]||(rm -f "$x";cc -o "$x" "$0")&&"$x" $*;exit

#import <stdio.h>
#import <stdint.h>
#import <time.h>

// Setting two adjacent bits produce an oscillator of period six.
// Setting two bits seperated by another produce an oscillator of period four.
// Setting ever other bit produces a still life.

uint8_t byte = 0x18;
uint8_t next;
uint8_t i;
uint8_t neighbours;

struct timespec cooldown = {0, 200000000};
struct timespec discarded;

#define getBit(sig) ((byte >> sig) & 1)

int main() {
	for(;;) {
		printf("|");
		for(i = 0; i < 8; i++) {
			printf(getBit(i) ? "*" : " ");
		}
		printf("| 0x%02X\n", byte);
		
		next = byte;
		
		for(i = 0; i < 8; i++) {
			neighbours = getBit((i + 7) % 8) + getBit((i + 1) % 8);
			
			if(neighbours == 1) {
				next ^=  (1 << i); // This cell is toggled next generation.
			} else if(neighbours > 1) {
				next &= ~(1 << i); // This cell is dead next generation.
			}
		}
		
		if(byte == next) {
			break;
		}
		
		byte = next;
		
		nanosleep(&cooldown, &discarded);
	}
}