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 left  = end - start + 1;     
    uint8_t right = (uint8_t)(((1u << left) - 1u) << start); 
    reg |= right;                                      
    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;
}