31. Rotate Left in an 8-bit Register

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    n = n % 8;
    for(int i = 0; i < n; i++) {
        uint8_t shift = 0;
        if ((reg >> 7) & 0x1) shift = 1;
        reg <<= 1;
        reg += shift;
    }
    return reg;
}

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