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
    if(reg == 0) {
        return 0;
    }
    /*
    uint8_t hi_pos = 0;
    for (uint8_t i = 0; i < 16; i++) {
        if (reg & (1 << i)) {
            hi_pos = i;
        }
    }
    uint16_t mask = (1 << hi_pos);
    reg = reg & mask;
    */
    uint16_t result = 1u << 15;
    while ((reg & result) == 0) {
        result >>= 1;
    }
    return result;
}

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

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

Solving Approach