Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    int output;
    if(pos==0){
        output = (reg>>0)& 0x0F;
    }
    if(pos==1){
        output = (reg>>4)& 0x0F;
    }
    return output;
}

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

Solving Approach