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

    uint16_t bounds;
    // Clear the bits before start
    bounds = 0xFF >> start;
    bounds <<= start;

    // Clear the bits after end
    bounds <<= (7 - end);
    bounds &= 0xFF;
    bounds >>= (7 - end);

    return reg | (uint8_t)bounds;
}

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