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) {
    // Ensure start <= end
    if (start > end || start > 7 || end > 7) {
        return reg;  // Invalid input, return unchanged
    }

    for (uint8_t i = start; i <= end; i++) {
        reg |= (1 << i);
    }

    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