30. Select Driver Overload

In a microcontroller HAL, the init() function has two overloads:

• One initializes using a GPIO pin number
• One initializes using a port pointer

void init(int pin);
void init(int* portPtr);

You must:

• Read a mode value
• If mode = 1 → initialize using a pin number
• If mode = 2 → initialize using a null port pointer (nullptr)
• Call the correct overload
• Print the corresponding message

Output rules:

• Calling init(int pin) → print

  • PIN <pin>
    

• Calling init(int* ptr) with a nullptr → print

  • PORT NULL 

Important:
You must use nullptr, not 0 or NULL, to ensure the pointer overload is selected.

Example 1

Input:

1 7

Output:

PIN 7 

Example 2

Input:

2

Output:

PORT NULL