int n = 0; n = digitalRead(4) if(n == 0)

This code snippet is written in the Arduino programming language.

It initializes an integer variable `n` to 0 and then reads the digital input value from pin 4 using the `digitalRead()` function. The value of the input is stored in `n`.

After that, it checks if the value of `n` is equal to 0 using an `if` statement. If the value of `n` is indeed 0, then the code inside the `if` block will be executed. If the value of `n` is not 0, then the code inside the `if` block will be skipped.