18. Set Multiple Bits in 8-bit Register

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

uint8_t set_range(uint8_t reg, uint8_t start, uint8_t end) {
    // Your code here
    //uint8_t mask = 1 << start;
    //while (start < end) { 
    //    mask = (mask << 1) | 0x1;
    //    start ++;
    //}
    //return reg | mask;
    while (start <= end) {
    reg |= 1u << start;
    start++;
  }
  return reg;
}

int main() {
    uint8_t reg, start, end;
    scanf("%hhu %hhu %hhu", &reg, &start, &end);
    printf("%u", set_range(reg, start, end));
    return 0;
}