Extract the Nibble from an 8-bit Register

Code

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

unsigned char extractNibble(unsigned char reg, int pos) {
    uint8_t nibble;
    if(pos == 0){
       nibble  = (reg & 0x0F);
    }else{
        nibble = (reg & 0xF0) >> 4;
    }
    return nibble;
}

int main() {
    unsigned char reg;
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%d", extractNibble(reg, pos));
    return 0;
}

Solving Approach