Weeks Worked Special Code

According to documentation the variable wkswork1 has a special variable code 00 = N/A. I assume this implies that the variable is missing if I see 00? However will 00 be a sting or integer? If it is an integer stata shows 00 as 0 so it might confuse actual zeros with missing. How can I determine if 0 is an actual zero or missing?

The universe for WKWORK1 is persons aged 16 and older who worked last year. There are no reported values of zero hours in the data; the range of valid responses for this variable is 1-52. All values for this variable will be represented as an integer in a statistical package; all 0 codes can be interpreted as N/A.

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