C Print To Std Error
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C Print Standard Error
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Fprintf Stderr C
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Print To Stderr Perl
a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How I can print to stderr in C? [closed] up vote -3 down vote http://forum.codecall.net/topic/61791-writing-to-stderr-in-c/ favorite In C, Printing to stdout is easy, with printf from stdio.h. However, how can print to stderr? We can use fprintf to achieve it apparently, but its syntax seems strange. Maybe we can use printf to print to stderr? c printf stderr share|improve this question edited Aug 17 at 18:01 asked Aug 17 at 16:40 wad 64 closed as off-topic by KevinDTimm, Paul R, Olaf, qrdl, Ashish Ahuja ツ Aug http://stackoverflow.com/questions/39002052/how-i-can-print-to-stderr-in-c 20 at 5:25 This question appears to be off-topic. The users who voted to close gave this specific reason:"This question was caused by a problem that can no longer be reproduced or a simple typographical error. While similar questions may be on-topic here, this one was resolved in a manner unlikely to help future readers. This can often be avoided by identifying and closely inspecting the shortest program necessary to reproduce the problem before posting." – Paul R, Olaf, qrdl, Ashish Ahuja ツIf this question can be reworded to fit the rules in the help center, please edit the question. 4 What's so "strange" about it's syntax? It's print where, how and what. –Eugene Sh. Aug 17 at 16:42 4 I am focusing on it. The only problem which is arising from the question, that you find the solution "strange". Otherwise there is no question. Use fprintf. –Eugene Sh. Aug 17 at 16:46 @Eugene. I agree with you. I thought it was strange as I did not realize stderr is a FILE :) –wad Aug 17 at 16:49 add a comment| 4 Answers 4 active oldest votes up vote 5 down vote accepted The syntax is almost the same as printf. With printf you gi
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us http://stackoverflow.com/questions/12102332/when-should-i-use-perror-and-fprintfstderr Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow https://www.rosettacode.org/wiki/Hello_world/Standard_error Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up When should I use perror(“…”) and fprintf(stderr, “…”)? up print to vote 54 down vote favorite 24 Reading the man pages and some code did not really help me in understanding the difference between - or better, when I should use - perror("...") or fprintf(stderr, "..."). c stderr share|improve this question edited Jan 11 at 22:36 Jamal 56261625 asked Aug 24 '12 at 2:03 freeboy1015 6771612 add a comment| 4 Answers 4 active oldest votes up vote 56 print to std down vote accepted Calling perror will give you the interpreted value of errno, which is a thread-local error value written to by POSIX syscalls (i.e., every thread has it's own value for errno). For instance, if you made a call to open(), and there was an error generated (i.e., it returned -1), you could then call perror immediately afterwards to see what the actual error was. Keep in mind that if you call other syscalls in the meantime, then the value in errno will be written over, and calling perror won't be of any use in diagnosing your issue if an error was generated by an earlier syscall. fprintf(stderr, ...) on the other-hand can be used to print your own custom error messages. By printing to stderr, you avoid your error reporting output being mixed with "normal" output that should be going to stdout. Keep in mind that fprintf(stderr, "%s\n", strerror(errno)) is similar to perror(NULL) since a call to strerror(errno) will generate the printed string value for errno, and you can then combined that with any other custom error message via fprintf. share|improve this answer edited Aug 22 at 20:11 Lambda Ninja 7,85182861 answered Aug 24 '12 at 2:07 Jason
< Hello worldJump to:navigation, search Hello world/Standard error You are encouraged to solve this task according to the task description, using any language you may know. Hello world/Standard error is part of Short Circuit's Console Program Basics selection. A common practice in computing is to send error messages to a different output stream than normal text console messages. The normal messages print to what is called "standard output" or "standard out". The error messages print to "standard error". This separation can be used to redirect error messages to a different place than normal messages. Task Show how to print a message to standard error by printing Goodbye, World! on that stream. Contents 1 4DOS Batch 2 Ada 3 Aime 4 ALGOL 68 5 Argile 6 ATS 7 AutoHotkey 8 AutoIt 9 AWK 10 BASIC 10.1 ZX Spectrum Basic 11 Batch File 12 BBC BASIC 13 C 14 C# 15 C++ 16 Clojure 17 CMake 18 COBOL 19 CoffeeScript 20 Common Lisp 21 D 21.1 Alternative Version 22 Déjà Vu 23 Delphi 24 Dylan.NET 25 E 26 Elixir 27 Emacs Lisp 28 Erlang 29 Euphoria 30 F# 31 Factor 32 Fantom 33 Forth 34 Fortran 35 Frink 36 Go 37 Groovy 38 Haskell 39 Icon and Unicon 40 J 41 Java 42 JavaScript 43 jq 44 Julia 45 Lasso 46 Lingo 47 Logtalk 48 Lua 49 m4 50 Mathematica / Wolfram Language 51 MATLAB / Octave 52 Mercury 53 Metafont 54 ML/I 55 Modula-2 56 Modula-3 57 Nemerle 58 NetRexx 59 Nim 60 Oberon-2 61 Objective-C 62 OCaml 63 Octave 64 Oforth 65 ooRexx 66 Oz 67 PARI/GP 68 Pascal 69 Perl 70 Perl 6 71 Phix 72 PHP 73 PicoLisp 74 PL/I 75 PostScript 76 PowerBASIC 77 PowerShell 78 PureBasic 79 Python 80 R 81 Ra 82 Racket 83 Retro 84 REXX 84.1 version 1 84.2 version 2 84.3 version 3 85 Ring 86 Ruby 87 Run BASIC 88 Rust 89 S-lang 90 Salmon 91 Sather 92 Scala 92.1 Ad hoc REPL solution 92.2 Via Java runtime 92.3 Via Scala Console API 92.4 Short term deviation to err 92.5 Long term deviation to err 93 Scheme 94 sed 95