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
    uint8_t temp  ;
    temp = 0b00000000 ;
    temp = (temp | ((1 << (end - start + 1)) - 1)) << start ;   
    /*
        Không phải set end bit
        Phải set end - start + 1 bit mới đúng
    */

    reg |= temp;

    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;
}

Solving Approach