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
    uint32_t flag = 1u;
    uint32_t mask = 0;
    while(flag <= reg)
    {
        mask = flag;
        flag = flag << 1;
    }
    reg = 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