Extract a Bit Field from a 32-bit Register

Code

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

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
        if(pos>0){ //apply only when pos > 0 , hence pos = 0 case will automatically becmes 0;
        reg = (reg >> pos) & 0x0F;
        }
        return reg ;
} 
    


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;
}

Solving Approach