Bit Spreading Interleave Bits with Zeros

Code

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

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    uint16_t r = val;

    // Step-by-step spreading
    r = (r | (r << 4)) & 0x0F0F;   // spread every 4 bits
    r = (r | (r << 2)) & 0x3333;   // spread every 2 bits
    r = (r | (r << 1)) & 0x5555;   // spread into even positions

    return r;
    
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);

    uint16_t result = spread_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach