Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>
#include <stdint.h>
unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    short temp =0;
    if( pos ==0){
        for( int i = 0 ; i<=3 ; i++){
          if( reg & (1<<i)){
            temp |= (1<< (i));
          }
        }
    }
    else {
        for( int i = 4 ; i<=7 ; i++){
          if( reg & (1<<i)){
            temp |= (1<< (i-4));
          }
        }
    }

    return temp;
}

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

Solving Approach