22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    // uint32_t bits = reg & 0x55555555;
    uint32_t i = 0, bits = 0, j=0;
    for(i=0;i<32;i=i+2){
         bits |= ((reg>>i)&1)<<j;
         j++;
    }
    return bits;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}