22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t temp = 0;
    for(int i=0;i<31;i=i+2){
        temp |= ((reg >> i) & 1U) << (i>>1); //(i>>1) equivalent to i divide by 2
    }
    return temp;
}

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