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Why are #ifndef and #define used in C++ header files? I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of the file is #endif What is the purpose of this?
python - Convert Pandas Column to DateTime - Stack Overflow I have one field in a pandas DataFrame that was imported as string format It should be a datetime variable How do I convert it to a datetime column, and then filter based on date? Example: raw_da
c - What mean file with extension h. in? - Stack Overflow Typically, a h in file is a header template that is filled in to become the actual header by a configure script based on the outcome of several tests for features present on the target platform
cron - How do I schedule jobs in Jenkins? - Stack Overflow A job that runs every 15 minutes has H 15 in the first field Note that the H in the first field has a special meaning If you wanted a job to run every 15 minutes, you could configure it as 0 15, which would make it run at the start of every hour However, if you configure too many jobs this way, you can overload your Jenkins controller