Keep Only the Highest Set Bit

Code

#include <stdio.h>
#include <stdint.h>
#define READ_BIT(REG, BIT)     

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    int pos = 0,flag = 0;
    int retval = 0;
    for(int index  = 0;index < 16;index++)
    {
        if((((reg) >> (index)) & 0x1U))
        {
            flag = 1;
            pos = index;
        }
    }
    if(flag)
    {
        retval |= (1 << pos);
    }

    return retval;
}

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

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

Solving Approach