Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {

    uint16_t mask = 0x8000;

    // Look for the MSB
    for (; mask != 0; mask >>= 1)
    {
        if (reg & mask) break;
    }

    // Clear remaining bits
    for (mask >>= 1; mask != 0; mask >>= 1)
    {
        reg &= ~ mask;
    }

    return reg;
}

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

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

Solving Approach