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 pos = 0, curlen = 0;
    for(int i = 0; i<16; i++){
        if(reg>>i){
            curlen = i;
            if(pos < curlen){
                pos = curlen;
            }
        }
    }
    uint16_t ans = 0;
    if(pos == 0) return 0;
    return (ans)|(1<<pos);
}

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

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

Solving Approach