Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    switch(pos){
        case 0:
            return (reg  & (0xF));
        case 1:
            return ((reg >> 4) & (0xF));
        default:
            return reg;
            break;
    }
}

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

Solving Approach