19. Extract a Bit Field from a 32-bit Register

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

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    uint32_t reg1 =0;
    int j=0;
   for(int i=pos;i<pos+len;i++)
   {
    if(reg & (1<<i))
    reg1 |= (1<<j);
    j++;
   }
    return reg1;
}

int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", extract_field(reg, pos, len));
    return 0;
}