Keep Only the Highest Set Bit

Code

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

uint16_t highest_set_bit(uint16_t reg)
{
    int index = 0;
    for(int i = 0;i<16;i++)
    {
      if((reg&(1<<i)))
        index = i;
    }
    reg = reg &(1<<index);
    return reg;
}

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

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

Solving Approach