Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    int lower_nibble =0x0f;
    int upper_nibble =0xf0;
    if(pos){
        return ((reg &upper_nibble)>>4);
    }
    else{
return reg&lower_nibble;
}
    }
    

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

Solving Approach