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

    
    if (reg == 0)
    {
        return 0;
    }

    uint16_t var = 0x8000;
    int x = 1;
    //loop until result is not 0 but first bit that is 1.
    while ((reg & var)==0)
    {
        var = (0x8000 >> x);
        x++;
    }


    return var;
}

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

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

Solving Approach