How to determine whether the program in progress? ? ?

I used to do a cocos2d game, there is a pause in the interface menu, I click the game stops, and then click on the game began.

I ask, is there a function or a variable can determine the game is in progress? So I can pause or start the game were based on the results of judgment,

Trouble you, I was a rookie
Reply:
Define an enumerated type, which means that now the state like ⋯ ⋯
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There's really nothing to say it wants a 1L
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Whether the operation can only rely on their own judgment
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The game is running is controlled by you, ah, you need to tell you who ah. You also define variables and control ah
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So simple, how I want it! True bs own