Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

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

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

Solving Approach