How to return a value from a void function and use it inside the void loop?

Using Arduino Programming Questions
3

By defining the function to return void, you CANNOT return a value. If you want to return a value, then you wouldn't use a function returning void.

If you want to return LOW or HIGH then have the function return int.

int print() {
  
  if(intPressure != 0)
  {  
    Serial.println("HIGH");
    tweet = HIGH;
  }
  else 
  {
    Serial.println("LOW");
    tweet = LOW;
  }

  return tweet;

}

And then to use it in the loop function you'd have to assign that return value to something or use it somewhere it is useful. Like:

int someVariableName = print();

or even:

if(print()){
    // code for when tweet was HIGH 
}
else {
    //code for when tweet was LOW
}