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Next message (by thread): [erlang-questions] Built-in io:format syntax for printing lists? Messages sorted by: Phrase = io_lib:format("The ~p in the ~p", ["cat", "hat"]) Depending on what you are going to do, you may have to apply lists:flatten to the string to get a flat list. io_lib:format has the same format options as io:format, and is in fact called by io:format to generate the output string. The first formats to terminal output, while the second formats to an iolist. The format specifiers differ from printf, refer to the Erlang documentation for details. Erlang - Numbers - In Erlang there are 2 types of numeric literals which are integers and floats.
The data is tokenized and parsed as ifit were an Erlang form - one of the valid Erlangexpressions in an Erlang source file - until a final'.'is reached. The result of io:format that you see as "test." is the rendered version as sent to the terminal (including the newline) , then it returns ok. Conversely, the return value of io_lib:format that you see as "\"test\". " is simply the erlang shell's representation of the same string, with the quotes and newline escaped, and surrounded by its own quotes. Identifier = lists: flatten (io_lib: format (" ~s: ~s ()", [Mod, Name])), Len = max (40, string: len (Identifier)), % That weird syntax is similar to a C format string, but % in erlang's own weird way.
Luckily, the Erlang standard library functions :io.format/2 and :io_lib.format/2 may be used.
Erlang/OTP: erts/emulator/beam/erl_driver.h Fossies
Erlang provides a number of methods when working with I/O. It has easier classes to provide the following functionalities for files − Reading files; Writing to files; Seeing whether a file is a file or directory; File Operation Methods in Erlang. Let’s explore some of the file operations Erlang has to offer. There is an io_lib:formatwhich returns the formatted result instead of printing it. Notice io_lib as module name instead of io.
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Identifier = lists: flatten (io_lib: format (" ~s: ~s ()", [Mod, Name])), Len = max (40, string: len (Identifier)), % That weird syntax is similar to a C format string, but % in erlang's own weird way.
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This is done because the table do not change from a build to another and should not be regenerated outside of a bug or a fundamental change in the algorithm.
Erlang was developed by Ericsson to aid in the development of software for The io:format/2 function itself returns the atom ok if everything goes as planned. Name: an atom; Body: one or more erlang expressions; Return: The value of last expression. e.g: add(X, Y) -> X + Y. hello() -> io:format("Hello World!~n"). 关于erlang的io format各种格式的介绍比较多，但都不全面，这里自己做一个总结 。 3个输出函数.
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Jan 4, 2019 lot about Erlang recently, and I stumbled upon a strange behaviour: printing strings containing non-ascii characters, e.g.
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