bw.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <time.h>

void print_bits         (uint8_t vals);
void bitwise_and        ();
void bitwise_and_assign ();
void bitwise_or         ();
void bitwise_or_assign  ();
void bitwise_not        ();
void bitwise_xor        ();
void bitwise_lshift     ();
void bitwise_rshift     ();

int main (int argc, char** argv) {

    time_t t;
    srand((unsigned)time(&t));

    bitwise_and       ();
    bitwise_or        ();
    bitwise_and_assign();
    bitwise_or_assign ();
    bitwise_not       ();
    bitwise_xor       ();
    bitwise_lshift    ();
    bitwise_rshift    ();

    return 0;
}

void rand_u8 (uint8_t* ptr) {
    *ptr = (rand() % 255);
}

void print_bits (uint8_t val) {
    printf("\tval (%-3u) bits: ", val);
    uint8_t max_pow = 1 << (sizeof(uint8_t) * 8 - 1);
    for (int i = 0; i < sizeof(uint8_t) * 8; i++) {
        int res = (val & max_pow);
        printf("\e[%dm%u\e[0m", res ? 34 : 91, res ? 1 : 0);
        val = val << 1;
    }
    printf("\n");
}

void bitwise_and() {
    printf("\e[91m%s\e[0m\n", "BITWISE AND ( & )");

    printf("\n bit a | bit b | a & b\n");
    printf(" ------+-------+--------\n");
    printf("    0  +   0   | 0\n" );
    printf(" ------+-------+--------\n");
    printf("    0  +   1   | 0\n" );
    printf(" ------+-------+--------\n");
    printf("    1  +   1   | 1\n" );
    printf(" ------+-------+--------\n");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);
        uint8_t rval; rand_u8(&rval);

        uint8_t res = (uint8_t)(lval & rval);
        printf("\n\e[92m%-2u\e[0m & %u = %u\n\n", rval, lval, res);
        print_bits(lval);
        print_bits(rval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_and_assign() {
    printf("\e[91m%s\e[0m\n", "BITWISE AND ASSIGN ( &= )");

    // @TODO: UPDATE ME - rows are c/p'd
    printf("\n bit a | bit b | a &= b\n");
    printf(" ------+-------+---------\n");
    printf("    0  +   0   | 0\n" );
    printf(" ------+-------+---------\n");
    printf("    0  +   1   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   0   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   1   | 1\n" );
    printf(" ------+-------+---------\n");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);
        uint8_t rval; rand_u8(&rval);

        uint8_t res = (uint8_t)(lval &= rval);
        printf("\n\e[92m%-2u\e[0m &= %u = %u\n\n", rval, lval, res);
        print_bits(lval);
        print_bits(rval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_or() {
    printf("\e[91m%s\e[0m\n", "BITWISE OR ( | )");

    printf("\n bit a | bit b | a | b\n");
    printf(" ------+-------+---------\n");
    printf("    0  +   0   | 0\n" );
    printf(" ------+-------+---------\n");
    printf("    0  +   1   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   0   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   1   | 1\n" );
    printf(" ------+-------+---------\n");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);
        uint8_t rval; rand_u8(&rval);

        uint8_t res = (uint8_t)(lval | rval);
        printf("\n\e[92m%-2u\e[0m | %u = %u\n\n", rval, lval, res);
        print_bits(lval);
        print_bits(rval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_or_assign() {
    printf("\e[91m%s\e[0m\n", "BITWISE OR ASSIGN ( |= )");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);
        uint8_t rval; rand_u8(&rval);

        uint8_t res = (uint8_t)(lval |= rval);
        printf("\n\e[92m%-2u\e[0m |= %u = %u\n\n", rval, lval, res);
        print_bits(lval);
        print_bits(rval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_not() {
    printf("\e[91m%s\e[0m\n", "BITWISE NOT ( ~ )");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);

        uint8_t res = (uint8_t)(~lval);
        printf("\n\e[92m~%-2u\e[0m = %u\n\n", lval, res);
        print_bits(lval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_xor() {
    printf("\e[91m%s\e[0m\n", "BITWISE XOR ( ^ )");

    printf("\n bit a | bit b | a ^ b\n");
    printf(" ------+-------+---------\n");
    printf("    0  +   0   | 0\n" );
    printf(" ------+-------+---------\n");
    printf("    0  +   1   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   0   | 1\n" );
    printf(" ------+-------+---------\n");
    printf("    1  +   1   | 0\n" );
    printf(" ------+-------+---------\n");

    for (uint8_t i = 0; i < 5; i++) {
        uint8_t lval; rand_u8(&lval);
        uint8_t rval; rand_u8(&rval);
        uint8_t res = (uint8_t)(lval ^ rval);

        printf("\n\e[92m%-2u\e[0m ^ %u = %u\n\n", rval, lval, res);
        print_bits(lval);
        print_bits(rval);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_lshift() {
    printf("\e[91m%s\e[0m\n", "BITWISE SHIFT LEFT ( << 1 )");

    uint8_t val; rand_u8(&val);

    for (uint8_t i = 0; i < 8; i++) {
        uint8_t res = (uint8_t)(val << (i + 1));
        printf("\n\e[92m%-2u\e[0m << 1 = %u\n\n", val, res);
        print_bits(val);
        print_bits(res);

        printf("\n");
    }
}

void bitwise_rshift() {
    printf("\e[91m%s\e[0m\n", "BITWISE SHIFT RIGHT ( >> 1 )");

    uint8_t val; rand_u8(&val);

    for (uint8_t i = 0; i < 8; i++) {
        uint8_t res = (uint8_t)(val >> (i + 1));
        printf("\n\e[92m%-2u\e[0m >> 1 = %u\n\n", val, res);
        print_bits(val);
        print_bits(res);

        printf("\n");
    }
}