How do I trigger an action everytime a variable is incremented ?

In my game, time passes : t=t+1 or t=t+0.5 depending how log an action takes.

Some events have to occur everytime t is increased by 1 (not by 0.5)

How do I check :

When t is incremented by 1 -> action ?

Keep the previous value in another variable. Then check if t>=(PrevValue+1), then execute the event and set PrevValue to t.

My advice would be: don't increment the variable directly - call a function that increments the variable, and then the function can do other work that needs to be done at the same time as that.

Thank you both for your replies.

I guess I have to be more specific about the way the game works :

- Game is time related

- Every action from the player takes time : 0.33s, 0.5s or 1s Time is in seconds.

- There's a pnj on the game screen that moves everytime a second has passed.

Thus, I need to be able to check if a whole second has passed to give the PNJ the order to move 1 distance unit on screen.