Bit Reversal in an 8-bit Value

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

uint8_t reverse_bits(uint8_t val) {
	/*
    * 1234 5678 -> 5678 1234
    * 5678 1234 -> 7856 3412
    * 7856 3412 -> 8765 4321 
	*/

	// swap the first 4 with last 4 bits
	val = ((0xF0 & val) >> 4) | ((0x0F & val) << 4);
	// swap top two of 4 bits with bottom two of 4 bits
	val = ((0xCC & val) >> 2) | ((0x33 & val) << 2);
	// swap each pair of bits
	val = ((0xAA & val) >> 1) | ((0x55 & val) << 1);
	
	return val;
}

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

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