Erik Malund said:
Learning how to use the internet wisely is the important lesson.
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whatever you get from the net is worthless un less you are able to code the routine(s) yourself. If you do not have the capability to fully understand the routine(s) you will be stuck with "the little fix" that always is required to use downloaded stuff

This seems a little conceited. I used printf() or ctime() well before I understood how they worked, or how to code them myself. Even now, I see little point in writing them myself. After all, there are fully working implementations out there.

printf() or ctime() is NOT "downloaded internet code" they are C library functions and, as such, there is no 'adptation' required. to use those you do NOT need to "Learn how to use the internet wisely"

Erik