Keep Only the Highest Set Bit

Code

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

uint16_t highest_set_bit(uint16_t reg) {
    uint16_t i = 1<<15;
    while(1)
    {
        int flag = 0;
        if((i & reg) != 0) 
        {
            reg = i; 
            break;  
        }
        i = i >> 1;
        if(i == 0) 
            break;
    }
    return reg;
}

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

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

Solving Approach