Keep Only the Highest Set Bit

Code

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

// unsigned int highest_Set_Bit(unsigned int num) {
//     if (num == 0) return 0;
//     unsigned int pos = 0;
//     while (num != 0) {
//         num >>= 1;
//         pos++;
//     }
//     return 1 << (pos - 1);
// }


uint16_t highest_set_bit(uint16_t reg) {
    if (reg == 0) return 0; 

    reg |= (reg >> 1);
    reg |= (reg >> 2);
    reg |= (reg >> 4);
    reg |= (reg >> 8);

    return (reg + 1) >> 1;
}

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

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

Solving Approach