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) {
    //easy explaination 
    // uint8_t count = (end - start) + 1;
    // uint8_t mask = ((1 << count) - 1);
    // mask <<= start;
    // reg |= mask;

    // 1 way
    return (reg | (((1 << (end - start + 1)) - 1) << start));
}

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