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
    int i;
    int mask = 1 << start;
    for (i= start; i < end; i++) {
        mask |= (mask << 1);
    }
    return reg |=mask;}

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

use a loop to set all bits from start to end, then bitwise OR with register