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 b = (reg & 0x80) == 0x80;
        reg = reg << 1;
        reg |= b;
    }
    return reg;
}

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