Keep Only the Highest Set Bit

Code

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

uint16_t highest_set_bit(uint16_t reg) {
    int c=0 , pos;
    for(pos=15 ; pos>=0 ; pos--)
    {
        if(reg&1<<pos)
        c++;
    }

    for(pos=0 ; pos<=15 ; pos++)
    {
        if((reg&1<<pos) && c>1)
        {
            reg = reg^1<<pos;
            c--;
        }
    }
    return reg;
}

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

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

Solving Approach