Bit Reversal in an 8-bit Value

Code

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

uint8_t reverse_bits(uint8_t val) {
    // 1. Swap nibbles (0xFO becomes 0x0F)
    val = (val & 0xF0) >> 4 | (val & 0x0F) << 4;
    // 2. Swap pairs (0xCC becomes 0x33)
    val = (val & 0xCC) >> 2 | (val & 0x33) << 2;
    // 3. Swap single bits (0xAA becomes 0x55)
    val = (val & 0xAA) >> 1 | (val & 0x55) << 1;
    return val;
}

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

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

Solving Approach