Keep Only the Highest Set Bit

Code

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

uint16_t highest_set_bit(uint16_t reg) {
    int pos, tmp;
    while(pos!=16) {
        if(reg & 1 << pos) {
            tmp = pos;
            reg &= ~(1 << pos);
            pos++;
        }
        else pos++;
    }
    if(tmp != 0) reg |= (1 << tmp);
    return reg;
}

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

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

Solving Approach