Bit Spreading Interleave Bits with Zeros

Code

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

#define NUM_BITS 8 // uint8_t

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    uint16_t retVal   = 0;

    for (uint8_t valBit = 0; valBit < NUM_BITS; valBit++)
    {
        if (val & (1 << valBit))
        {
            retVal |= (1 << (valBit << 1));
        }
    }

    return retVal;
}

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

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

Solving Approach