Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned char au1_Ret;
    if( pos )
        au1_Ret = (reg >> 4) & 0x0F;
    else
        au1_Ret = reg & 0x0F;
    return au1_Ret;
}

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

Solving Approach