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 MSB = -1;
    uint16_t reg_copy = reg;

    while(reg_copy != 0){
        reg_copy = reg_copy >> 1;
        MSB++;
    }
    
    /*
    This while loop figures out which bit of the input is the MSB
    */

    reg = (1u << MSB);
    return reg;
}

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

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

Solving Approach