Joystickapi DLL(Incomplete)

//Controller: Return USB Controller Input
#include <Windows.h>
#define EXPORT extern "C" _declspec( dllexport )
#pragma comment( lib , "Winmm.lib" )
JOYINFOEX joystick[ 16 ];

//Controller: Initiate JOYINFOEX Data.
void JoyCheck( double joyid ) {
    if ( joystick[ int( joyid ) ].dwSize == false ) {
        joystick[ int( joyid ) ].dwSize = sizeof( JOYINFOEX );
        joystick[ int( joyid ) ].dwFlags = JOY_RETURNALL;
    }
}

//Controller: Check If Joystick Is Plugged In.
EXPORT double JoystickPlugged( double joyid ) {
    JoyCheck( joyid );

    bool joy = joyGetPosEx( UINT( joyid )  , &joystick[ int( joyid ) ] ) == JOYERR_NOERROR;
    return double( joy );
}

//Controller: Buttons Up To 1-32.
EXPORT double JoystickButtons( double joyid , double button ) {
    JoyCheck( joyid );
    return double( joystick[ int( joyid ) ].dwButtons & ( 1 << int( button ) ) );
}

//Controller: Left Joystick + Left Joystick Button.
EXPORT double JoystickJStickL( double joyid , double mode ) {
    JoyCheck( joyid );

    double joyXpos = double( joystick[ int( joyid ) ].dwXpos );
    double joyYpos = double( joystick[ int( joyid ) ].dwYpos );
    double joyZpos = double( joystick[ int( joyid ) ].dwZpos );

    switch( int( mode ) ) {
        case 0:
            return ( ( joyXpos == 65535 ) * 1 ) + ( ( joyXpos == 32511 ) * 0 ) + ( ( joyXpos == 0 ) * -1 );
        break;

        case 1:
            return ( ( joyYpos == 65535 ) * 1 ) + ( ( joyYpos == 32511 ) * 0 ) + ( ( joyYpos == 0 ) * -1 );
        break;

        case 2:
            return ( ( joyZpos == 1 ) * 1 ) + ( ( joyZpos == 0 ) * 0 );
        break;

        default:
            return -4;
        break;
    }
}

//Controller: Right Joystick + Right Joystick Button.
EXPORT double JoystickJStickR( double joyid , double mode ) {
    JoyCheck( joyid );

    double joyUpos = double( joystick[ int( joyid ) ].dwUpos );
    double joyVpos = double( joystick[ int( joyid ) ].dwVpos );
    double joyRpos = double( joystick[ int( joyid ) ].dwRpos );

    switch( int( mode ) ) {
        case 0:
            return ( ( joyUpos == 65535 ) * 1 ) + ( ( joyUpos == 32511 ) * 0 ) + ( ( joyUpos == 0 ) * -1 );
        break;

        case 1:
            return ( ( joyVpos == 65535 ) * 1 ) + ( ( joyVpos == 32511 ) * 0 ) + ( ( joyVpos == 0 ) * -1 );
        break;

        case 2:
            return ( ( joyRpos == 1 ) * 1 ) + ( ( joyRpos == 0 ) * 0 );
        break;
        default:
            return -4;
        break;
    }
}