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meaning - "You are used to" vs. "you used to use"


I'm currently reading some boring programming book and have found this phrase:



If you are used to C and printf(), you might think cout looks odd.



If I wrote this phrase (supposing I understand it correctly) I would say:



If you used to use C and ...



without are and with additional use.


So the question is: why was it written in that way? Is it a short way of writing “used to use” or am I missing something?



Answer



In the first sentence, If you are used to means 'If you are familiar with'. In the second, If you used to use means 'If you were in the habit of using in the past'.


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