Keep Only the Highest Set Bit

Code

#include <stdio.h>
#include <stdint.h>

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    int i;
    for(i = 31; i >= 0; i--){
        if(reg & (0x1 << i)){
            break;
        }
    }
    uint16_t mask = (0x1 << i) - 1;
    return reg & ~mask;
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);

    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach