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There are several techniques you can use to eliminate bouncing in a button using C++ on an Atmega 328p microcontroller:

1. Debouncing in software: One way to eliminate button bounce is to use software debouncing. You can do this by adding a delay after the button is pressed, checking the button state again after that delay, and only registering the button press if the state is still high.

2. Hardware debouncing: Another way to eliminate button bounce is to use a hardware debouncing circuit. This circuit can be as simple as a capacitor and resistor combination connected across the button terminals.

3. Using interrupts: You can also use interrupts to remove bouncing in a button. You can connect the button to an interrupt input pin on the microcontroller, and configure the microcontroller to trigger an interrupt when the button is pressed. When the interrupt occurs, the microcontroller can read the button state and execute the corresponding action.

Depending on the application and the circuitry involved, one of these techniques can effectively eliminate bouncing in a button.