Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    uint8_t len;
    uint8_t flag;
    len = 16;
    flag = 0;

    for (int i=len-1; i>=0; --i) {
        if ((reg & (1 << i)) && flag == 0) {
            flag = 1;
            continue;
        }

        if (flag == 1) {
            reg &= ~(1 << i);
        }
    }

    return reg;
}

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

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

Solving Approach