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Error Identifier Undeclared

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Error Null Undeclared

million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why do I get “error undeclared identifier” unless I declare my variable at the beginning? up vote 5 down error pcre_dupnames undeclared vote favorite When I have following: #include "stdafx.h" #include int main() { int val1,val2; printf("Enter the first value"); scanf("%d",val1); scanf("%d",&val2); int c; c=val1 + val2; printf(" the value is : %d", c); return 0; // 0 means no error } I get error undeclared identifier c. Also, syntax error. missing ; before type. However, if I change above to following error disappears. Please help #include "stdafx.h" #include int main() { int val1,val2,c; printf("Enter error errno undeclared the first value"); scanf("%d",&val1); scanf("%d",&val2); c=val1 + val2; printf(" the value is : %d", c); return 0; // 0 means no error } I am running C in VS 2010. c visual-studio-2010 share|improve this question edited Jan 23 '11 at 17:08 indiv 10.6k43269 asked Jan 23 '11 at 16:39 Programmer 2,429115391 add a comment| 5 Answers 5 active oldest votes up vote 3 down vote accepted In C, at least back in the old days, variable declarations have to come at the top of the block. C++ is different in that regard. edit — apparently C99 is different from C90 in this respect (C99 being essentially the same as C++ on this issue). share|improve this answer answered Jan 23 '11 at 16:41 Pointy 254k31335431 How does it work for C in vs 2010 –Programmer Jan 23 '11 at 16:45 VS2010 silently "broadens" the concept of a valid C program –mbaitoff Jan 23 '11 at 16:51 @mbaitoff: VS2010 doesn't have the concept of a C program. It only compiles C++ programs. You need MinGW if you still want to compile C programs on Windows. –Stefan Steiger Jan 23 '11 at 17:06 @Quandary: You can compile C Programs from VS 2010 command prompt. cl hello.c will give you hello.exe &

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Error Undeclared (first Use In This Function)

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Struct Undeclared First Use In This Function

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 What is an 'undeclared identifier' error and how do http://stackoverflow.com/questions/4774961/why-do-i-get-error-undeclared-identifier-unless-i-declare-my-variable-at-the-b I fix it? up vote 13 down vote favorite 8 What are undeclared identifier errors? What are common causes and how do I fix them? Example error texts: For the Visual Studio compiler: error C2065: 'printf' : undeclared identifier For the GCC compiler: `printf' undeclared (first use in this function) c++ compiler-errors declaration undeclared-identifier share|improve this question edited Mar 16 at 22:19 Vlad from Moscow 1 asked Mar http://stackoverflow.com/questions/22197030/what-is-an-undeclared-identifier-error-and-how-do-i-fix-it 5 '14 at 11:55 sashoalm 18.9k32151324 Good, now all there's left to do is use a more "C++" identifier, like the i/o streams. –Medinoc Mar 5 '14 at 12:10 A very common case is including and trying to use std::string without having included. May be worth mentioning. –πάντα ῥεῖ Mar 5 '14 at 12:12 3 @Wooble - It is hardly unprecedented. e.g. See What is a NullReferenceException and how do I fix it? though probably would have been much better as a self answered question with a canonical answer ready to go. –Martin Smith Mar 5 '14 at 12:13 1 @Wooble - I'm sure plenty of people asked and had their question closed as dupe of the canonical one –Martin Smith Mar 5 '14 at 12:16 add a comment| 6 Answers 6 active oldest votes up vote 21 down vote They most often come from forgetting to include the header file that contains the function declaration, for example, this program will give an 'undeclared identifier' error: Missing header int main() { std::cout << "Hello world!" << std::endl; return 0; } To fix it, we must include the header: #include int main() { std:

of referring to an undefined function, you are referring to an undefined variable. Sometimes this is a scope problem. You might error undeclared get this error if you tried to refer to another function's local variable. For example: #include void set_value() { int my_int = 5; } use in this /* To shorten example, not using argp */ int main() { my_int = 23; return 0; } The variable my_int is local to the function set_value, so referring to it from within main results in the following error: undec.c: In function `main': undec.c:10: `my_int' undeclared (first use in this function) undec.c:10: (Each undeclared identifier is reported only once undec.c:10: for each function it appears in.) different type arg: too few parameters...:

 

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