Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg)
{
    if (reg == 0)
    {
        return 0; // No bits are set
    }
    uint16_t mask = 1 << 15; // Start with the highest bit (bit 15) set 
    while ((reg & mask) == 0)
    {
        mask >>= 1; // Shift the mask right until we find the highest set bit
    }
    return mask;
}

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

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

Solving Approach