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
    int posi=-1,i;
    for(i=15;i>=0;i--)
    {
        if((reg>>i)&1)
        {
            posi=i;
            break;
        }
    }

    for(i=posi-1;i>=0;i--)
    {
        if((reg>>i)&1)
        {
            reg=reg&(~(1<<i));
        }
    }
    return reg;
}

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

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

Solving Approach