Set Multiple Bits in 8-bit Register

Code

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

uint8_t set_range(uint8_t reg, uint8_t start, uint8_t end) {
    // Your code here
    reg = reg | ~((-1 << (end+1)) | (-1 >> (8-start)));
    uint8_t g1 = (-1 << (end+1));
    uint8_t g2 = ((uint8_t)0xFF >> (8-start));
    // printf("%hhu\n", g1);
    // printf("%hhu\n", g2);
    return reg | ~(g1 | g2);
}

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

Solving Approach