Nibble Swap & Alternate Bit Swapping

int main( void )
{
    unsigned char  a = 40, b=20;

    a = ( a>>4 ) | ( a<<4 );

    b = ( ( b & 0xAA ) >> 1 ) | ( ( b & 0x55 ) << 1 );
   
    printf( "After Nibble Swap %d\n", a );
    printf( "Alternate Bit swapping %d\n", b );
    getch();

    return 0;
}