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Email Required, but never shown. The Overflow Blog. This little program takes a number on the command line and computes its factorial. However, it also contains cutting-edge AI functionality for runtime verification that the company's coding standards, including the correct use of whitespace and blank lines, are being followed. Removing a blank line will trigger the algorithm to reject the insufficiently maintainable program.
Due to the advanced mathematics involved, if you compile with gcc , remember to use -lm. The complicated vrfy function is never called, but rather the funny-looking vfry macro. It also uses the backslash character to spread a define over multiple lines, conveniently lined up well out of sight. However, it also does two things kind of wrong:. As a result, the output after removing the blank line is:. Returns success and can be used as an implementation for true.
If the empty line is removed you can use it as an implementation for false instead. If there is blank line between them the result is 2. This code prints Hello, World! Removing the blank line gives a syntax error instead. Perl's here-doc syntax for multi-line strings allows an empty terminator string. It's even explicitly documented. Removing the blank line causes the closing parenthesis and everything else up to the next blank line, if there is one to be interpreted as part of the string, causing a syntax error.
The error messages you get are actually pretty decent, for such an oddball syntax feature. If there is an empty line at the end of the program, you get something like this instead: syntax error at foo. This code will output Hello and on the next line World.
When either or both of the blank lines are removed, it outputs nothing at all. There is an explanation here. This isn't in any way hidden. If you remove the empty line, it gives the fourth character and the sixth if you add one. There's nothing to hide here, it does what it says, so I'm not spoilerizing the explanation. The function info is a swiss army knife of introspection what other languages call reflection. With the blank line, a is the local variable a and without it's the macro parameter Technically not a "code" issue, but a server one.
The function whereami responds with the position of the calling line, relative to its own position in the source code. If any blank line in the whereami function is removed. The output is NaN line s confusing me. Adding lines doesn't break it.
It actually only counts how many lines are between i and the first and last line respectively. If they fall under a given value. I tried to hide it a bit in unreadable ternary expressions. This perl script will read the script file and check if after the line containing "blabla" there is a closing bracket. Due to bug in escript implementation valid escript has to be at least three lines long and first line hast to be shebang line or empty line. So following script hast to have two empty lines where first one has to be first one:.
By the way that first letter is a thorn. This is a classic and rather dumb trick. You will know what it is when you see it, this is just here for completion's sake. As such, I'm marking this as a community wiki answer. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science.
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