IsNan equivalent in C

I have a piece of Javascript code and i am trying to convert it into C code. I have a problem to convert following line to C: var q = (!isNaN(dLat/dPhi)) ? dLat/dPhi : Math.cos(lat1); Can you tell me equivalent of isNan in C? Thanks.
are you trying to determine if is not null? if so check this out: stackoverflow.com/questions/872323/…

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