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
    // be careful when shifting 1 to leftmost, it not 16, 32 or 64!
    uint16_t mask = (1 << 15);

    while(mask > 0)
    {
        if(reg & mask)
        {
            break;
        }
        mask >>= 1;
    }

    return mask;
}

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

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

Solving Approach