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

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

My code

• I tried find the simple solution without a loop

Solution is more understandable 

uint8_t set_range(uint8_t reg, uint8_t start, uint8_t end) {
    uint8_t mask = ((1 << (end - start + 1)) - 1) << start; 
    return reg | mask;
}