Bit Reversal in an 8-bit Value

Code

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

#define GET_BIT(reg, pos)  ((reg >> pos) & 1)

uint8_t reverse_bits(uint8_t val) {
    uint8_t res = 0;
    uint8_t j = 7;
    for(int i = 0; i<8; i++) {
        res |=  (GET_BIT(val, i)) << j;
        j--;
    }
    return res;
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);

    uint8_t result = reverse_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach