While compling a program in C++ I got this error 'Linker Error: Undefined symbol _circle' Explanation please?

Question

While compling a program in C++ I got this error 'Linker Error: Undefined symbol _circle' Explanation please?

Answer 1

it means what it says: the symbol _circle used in the file FILE.CPP is ... used, but not defined anywhere.



the linker is the program (often called automatically after the compiler) that must find the code/memory for the symbols used, when they are not in the same "file" (roughly saying)... it "links" (the verb link has a meaning, right?) e.g. symbols of standard libraries with the code of the libraries, so that you can obtain an executable (even when the lib is not "embedded" but dynamically linked, —rather common—, the linker must check if the symbol can be "resolved")

Answer 2

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Answer 3

see first you need to know what is a linker and what is a linker error. After code compilation, that code is linked with all the library functions existent in your turboC directory...Now, that is the job of the linker to find out the body of the functions u have used like printf, scanf etc...Now you have used one function called "symbol_circle" which you have declared and called from the main function but you havent declared the body of it...During linking time, the linker sees that the function is called but it has got no corresponding code to execute...write a body of that function.....then u will find no linker error will occur..

Answer 4

Check whether you have entered the header file that consist of the circle() in ti. Eg. graphics.h in C and for pow() we use math.h



So just right click at the circle() in the TurboC editor and find the header file.



Enter the header file and try out.



If it still not works then check for the spellings and check for the inclusion of graphics in the code.

Answer 5

check the name (spell) of the variable where it was defined ... if the variable "_circle" is not defined in FILE.cpp, the re-declare the variable in this file using "extern" before using it .... still problem, then post ur code here .... good luck :)

Answer 6

the identifier circle is not defined in your library i.e. the library files where compiler searches for the code of included functions.

Include proper header files and use proper library.

Answer 7

hi dear,

linker error generally occurs when you are not writing any method properly.eg-prit() or print f().like this

secondly undefined symbole generally occured when the variable used by u is not declared.

Answer 8

maybe u havent declared _circle in ur program or somtimes it might be because u would't have given the correct directry to ur C

++ language..

Answer 9

Check ur declarations...give more details are you linking to any other file i mean dynamic linking..post u r code pl..

Answer 10

you have not give the definition of the circle function

if you are using circle function of the graphics than you need to add

graphics.h header file



and if you create your own function than include a prototype defintion of the function before main like

int circle(int);