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 len = end - start +1;   // trying to make a mask of the correct length and is inclusive so + 1
    uint8_t mask = (1 << len)-1;    // making the mask then -1 to make bits to right =1
    mask = (mask << start);         // just setting the mask position to whever we need to start.

    return reg | mask;              // set 
}

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