How To Fix Linker Error In Turbo C
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How To Solve Linker Error In C
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C++ Linker Error Undefined Symbol In Module
each other. Join them; it only takes a minute: Sign up Linker error in C. while using
module It means that you have not enabled the graphics library for linking. By default this setting is http://www.softwareandfinance.com/Turbo_C/Graphics_initgraph.html OFF when you install Turbo C++ version 3.0. All you need to do is, from turbo c++ menu, goto Options -> Linker -> Libraries... and check the Graphics Library option Disclaimer: This web site is for educational and informational purposes only. Click here to read the Disclaimer. Content copyright 2010-2015. Betelgeuse LLC. All rights reserved.
Practice Problems Quizzes Resources Source Code Source Code Snippets C and C++ Tips Finding a Job References Function Reference Syntax Reference Programming FAQ Getting Help Message Board Email http://www.cprogramming.com/tutorial/compiler_linker_errors.html About Us Dealing with Compiler Errors - Surviving the Compilation Process By Alex Allain It's your first C (or C++) program--it's not that long, and you're about to compile it. You hit http://community.embarcadero.com/article/technical-articles/162-programming/14926-understanding-undefined-symbol-error-messages compile (or enter the build command) and wait. Your compiler spits out fifty lines of text. You pick out words like "warning and "error". Does that mean it worked? you wonder. linker error You look for the resulting executable. Nothing. Damn, you think, I guess I have to figure out what this all means... The Types of Compilation Errors First, let's distinguish between the types of errors: most compilers will give three types of compile-time alerts: compiler warnings, compiler errors, and linker errors. Although you don't want to ignore them, compiler warnings aren't something severe linker error in enough to actually keep your program from compiling. Usually, compiler warnings are an indication that something might go wrong at runtime. How can the compiler know this at all? You might be making a typical mistake that the compiler knows about. A common example is using the assignment operator ('=') instead of the equality operator ('==') inside an if statement. Your compiler may also warn you about using variables that haven't been initialized and other similar mistakes. Generally, you can set the warning level of your compiler--I like to keep it at its highest level so that my compiler warnings don't turn in to bugs in the running program ('runtime bugs'). Nevertheless, compiler warnings aren't going to stop you from getting your program working (unless you tell your compiler to treat warnings as errors), so they're probably a bit less frustrating than errors. Errors are conditions that prevent the compiler from completing the compilation of your files. Compiler errors are restricted to single source code files and are the result of 'syntax errors'. What this really means is that you've done something that the compiler ca
View All Answers My Questions Articles Tutorial Tips, Tricks & Techniques News Database Support Community Forums Search Recent DiscussionsResourcesQuality PortalEvents CalendarEmbarcadero on YouTube Job BoardRegistered User DownloadsTrial Downloads Books Login Register HomeArticlesTips, Tricks & TechniquesPROGRAMMINGUnderstanding "Undefined Symbol" Error Messages. Understanding "Undefined Symbol" Error Messages. Written by Embarcadero USA. Posted in PROGRAMMING Technical Information Database TI688C.txt Understanding "Undefined Symbol" Error Messages. Category :General Platform :All Product :Borland C++ ALL Description: One of the most common error messages seen by developers using a C or C++ compiler is "undefined symbol." This document provides a general description of what causes undefined symbol error messages, as well as instructions on solving specific undefined symbol errors. UNDEFINED SYMBOL AT COMPILE TIME An undefined symbol at compile time indicates that the named identifier was used in the named source file, but had no definition in the source file. This is usually caused by a misspelled identifier name, or missing declaration of the identifier used. EXAMPLE 1: int main(void) { test = 1; return 0; } The code shown for example one will cause an undefined symbol error message to be displayed because the variable "test" has not been declared in either a header file which has been included or in the actual code itself. EXAMPLE 2: int main(void) { int test; Test = 1; return 0; } The code shown for example one will cause an undefined symbol error message to be displayed because when the variable "test" was used it was misspelled. The misspelling was a capital 't' instead of a lower case 't'. EXAMPLE 3: int main(void) { int test; test = 1; return 0; } The code shown in example three has no errors and is an example of what must be done to resolve an undefined symbol error message. In the example here we simply made sure we have a definition for the integer test and that we spelled it the same at the time we used it. It's that simple! UNDEFINED SYMBOL AT LINK TIME When linking multi-file projects, the linker must resolve all references to functions and global variables shared between modules. When these references cannot be resolved, the linker generates