31. Rotate Left in an 8-bit Register

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    // (val << n)         -> Shifts bits left
    // (val >> (8 - n))   -> Moves the overflow bits to the right
    // & 0xFF             -> Ensures result is treated as 8-bit
    return ((reg << n) | (reg >> (8-n)) & 0xFF);
}

int main() {
    uint8_t reg, n;
    scanf("%hhu %hhu", &reg, &n);
    printf("%u", rotate_left(reg, n));
    return 0;
}