Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
        if (reg == 0) return 0;

    // keep shifting right until only MSB remains
    while (reg & (reg - 1)) {
        reg &= (reg - 1);  // clear lowest set bit
    }
    return reg;
}

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

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

Solving Approach