Bit manipulation

#include <stdio.h>

typedef void (*bit_fn_t)(const int, const int);

// extract and transform bits
void transform_bits(bit_fn_t bit_fn, unsigned int x, int n) {
    for (int idx = n - 1; idx >= 0; --idx) {
        const int bit = (x >> idx) & 1;
        bit_fn(idx, bit);
    }
}

// function to apply to each bit
void bitFoo(const int bit_idx, const int bit) {
    printf("%d) %d\n", bit_idx, bit);
}

int main() {
    unsigned int x = 103;  // = '01100111'
    int n = 8;  // number of bits to extract

    printf("> bits of %u:\n", x);
    transform_bits(bitFoo, x, n);
    printf("\n");

    return 0;
}

//** compile:
// gcc -std=c11 -Wall -O3 -o bits.exe bits.c

//** run:
// ./bits.exe