bit-ops/bit-ops.c

#include <stdio.h>

void zeroth_bit_test();

unsigned char PTAD;

void do_bit_ops() {
	PTAD = 0x10;
	printf("PTAD = %#x\n* OR\n", PTAD);
	PTAD |= 0x01;
	printf("PTAD |= 0x01 --> %#010x (%#x)\n", PTAD, PTAD);

	printf("----------\n* AND\n");
	printf("PTAD = %#x\n", PTAD=0x1f);
	PTAD &= 0xfe;
	printf("PTAD &= 0xfe --> %#010x (%#x)\n", PTAD, PTAD);

	printf("----------\n* NOT\n");
	printf("PTAD = %#x\n", PTAD=0x10);
	PTAD = ~PTAD;
	printf("PTAD = ~PTAD --> %#010x (%#x)\n", PTAD, PTAD);

	printf("----------\n* XOR\n");
	printf("PTAD = %#x\n", PTAD=0x10);
	PTAD ^= 0xfe;
	printf("PTAD ^= 0xfe --> %#010x (%#x)\n", PTAD, PTAD);

	zeroth_bit_test();
}

void zeroth_bit_test() {
	PTAD = 0x10;
	printf("----------\n* 0th bit test\n");
	for (PTAD = 0x00; PTAD < 0x0a; PTAD++){
		printf("PTAD = %u (", PTAD);
		for (int i = 0; i < 8; i++) {
			printf("%d", !!((PTAD << i) & 0x80));
		}
		printf(")\n");
		if ( PTAD & 0x01 ) {
			printf("0th bit is 1\n");
		} else {
			printf("0th bit is 0\n");
		}
	}
}


int main() {
	printf("*** bit-ops pls ***\n");
	do_bit_ops();
	return 0;
}