Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

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

}

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

Solving Approach

masking  concept used and for upper nibble we only need shift that higher nibble to lower nibble side.