Rotate Left in an 8-bit Register

Code

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    int ex1;
    while(n){
    ex1 = reg & 0x80;
    reg = reg << 1;
    if(ex1) reg  = reg | 0x01;
    else reg = reg | 0x00;
    n--;
    }
    return reg;

}

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

Solving Approach