Keep Only the Highest Set Bit

Code

#include <stdio.h>
#include <stdint.h>
#define firstlogic
// Complete the function
uint16_t highest_set_bit(uint16_t reg) {

#ifdef    firstlogic
    uint16_t count =0;
    for(uint16_t i =0 ; i < 16 ; i++)  
    {
        if((reg & ( 1<< 15)) == 0)
        {
            count++;
        }else
        {
             break;
        }
      

        reg = (reg << 1);

    }
    reg = 0;

    reg = ( 1 << (15 - count));

    return reg;

#else


    uint16_t result1 = 1 << 15;

    while((reg & result1) == 0)
    {
        result1 >>= 1;

    }
    return result1;

#endif
}

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

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

Solving Approach