CelToFahr(tCel) = 9/5*tCel + 32

#or

CelToFahr = tCel -> 9/5*tCel + 32

#or

#this is the preferred way, the others are just quick ways to do minimal stuff.
function CelToFahr(tCel)
    tFahr = 9/5*tCel + 32
    return tFahr
end