Button Press Callback

Question

Problem: Button Press Callback. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 
#include 
using namespace std;

void onPressA() { cout << "Button A pressed
"; }
void onPressB() { cout << "Button B pressed
"; }

void simulatePress(void (*callback)()) {
    callback(); // call the function passed in
}

int main() {
    string input;
    cin >> input;

    if (input == "A") {
        simulatePress(onPressA);
    } else if (input == "B") {
        simulatePress(onPressB);
    }

    return 0; 
}

Explanation & Logic Summary:

simulatePress takes a function pointer callback.
When called, it runs whichever function is passed (onPressA or onPressB).
This shows how the program can register different behaviors dynamically.

👉 In simple words:
Think of the button as a doorbell. The callback is who answers the door. You can change who answers without changing the doorbell itself.

Firmware Relevance & Real-World Context:

This is exactly how interrupts and callbacks work in firmware.
Example:
- A GPIO button press triggers an interrupt.
- The programmer sets a callback that runs when the interrupt fires.
This makes code modular — you can reuse the same button code but change the action as needed.

193. Button Press Callback