![]() ![]() ![]() read-char read-byte read-line read-bytes-line read : read a datum from an input. These are the top rated real world C (Cpp) examples of std::ifstream::peek extracted from open source projects. A separate racket-lib file describes some interesting libraries. If the data type to be read is known beforehand, use read-char, read-string, read-bytes.Īlso, take a look at this implemenation for reading formatted input - a scanf in Scheme. C (Cpp) ifstream::peek - 30 examples found. I'd use the read procedure for the general case. In Windows, replace (read-line (current-input-port) 'any) with (read-line) and see what happens. Files: The open-output-file function opens a file for writing, and open-input-file opens a file for reading. ![]() The first section explains reading and writing files, with examples. (char->integer (string-ref a (- (string-length a) 1)))) The Racket Guide has a chapter on Input and Output. (printf "input: ~a, length: ~a, last character: ~a\n" (define a (read-line (current-input-port) 'any)) Racket file peek char portable#So, 'any is required to be portable when the input port is not a file (standard input). Opened in text mode, 'linefeed is usually the appropriate read-line Return-linefeed combinations to a linefeed. ForĮxample, reading a file in text mode on Windows automatically changes I made a shell script that receives a racket file as a parameter and uses it to run the command below to execute the file and stay in interactive mode. Return and linefeed characters are detected after the conversions thatĪre automatically performed when reading a file in text mode. To be portable across Unix and Windows, additional option is required. If the port is at end of file then char-ready returns. For instance (regexp-match #px" *( )" (current-input-port)) If char-ready returns t then the next read-char operation on the given port is guaranteed not to hang. scanf does), I would suggest a regexp-match on the input. at the low level, I would suggest (read-line) and (read-bytes). You can do pretty much everything you want to. ![]()
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