Help with multiple conditions in an If statement(s)

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1

Hi:
I have a problem with trying to set up a valid heat index calculation. I make the initial calculation no problem. Then you make an adjustment if RH (relative humidity is < 13%) and (80 <t and t < 112). I don't know how to set this up. There is one other complication. If t <80 another formula with no adjustments are needed. Thanks for any guidance.
Bob

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 if (t < 80) {...}
else if (RH  < 0.13 and t < 112) {...
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and? You still suck in the Pascal days? How about &&?

EDIT : OMG, when did and get added to c++?

-jim lee