FAQ: Variables - Type

This community-built FAQ covers the “Type” exercise from the lesson “Variables”.

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Learn Swift

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so im learning swift and i had to Declare a Double variable named tempf and initialize it with the temperature.

Declare another Double variable named tempc .

i have had problems before where i type the right code and it says its incorrect but gives no error but this time its giving me a error, i dont see how my code it wrong
var tempf: double = 84.0 var tempc: double = 9.0
and its giving me this error,
“Temperature.swift:2:12: error: use of undeclared type ‘double’
var tempf: double = 84.0”