c error null undeclared (first use in this function)

my compiler would say 'NULL' undeclared (first use this function)...

my compiler would say 'NULL' undeclared (first use this function)? you are misunderstanding the error message: First use in this function.

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NULL is defined in stddef.h, is used very widely, and is a reference to a n...

NULL is defined in stddef.h, is used very widely, and is a reference to a null . error: 'NULL' undeclared (first use in this function) /// return.

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NULL is not a built-in constant in the C or C++ languages. In fact, in C++ ...

NULL is not a built-in constant in the C or C++ languages. In fact, in C++ it's more or less obsolete, just use a plain literal 0 instead, the compiler.

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If you really really really like to type nullptr in C, you can use Notice t...

If you really really really like to type nullptr in C, you can use Notice that C has the NULL macro from ; it is readable too, but its.

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main.c: In function 'main': main.c error: 'file' undecl...

main.c: In function 'main': main.c error: 'file' undeclared (first use in FILE and NULL are wrongly written (C is case sensitive). fopen line was missing a semicolon. pointed out, your main() function should be specified as returning an int Alternatively, you could make it return 1; (error codes are usually.

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I got this error today: error C ''NULL'': undeclared id...

I got this error today: error C ''NULL'': undeclared identifier The code line it NULL is defined in stdlib.h/cstdlib and is very much standard C and C++. He''s using Visual Studio though (guessing from the look of the error message) “Debugging is twice as hard as writing the code in the first place.

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`NULL' undeclared (first use in this function). (Each undeclared ident...

`NULL' undeclared (first use in this function). (Each undeclared identifier is reported only once for each function it appears in.) syntax error.

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variable ' undeclared (first use in this function): In C and C++ varia...

variable ' undeclared (first use in this function): In C and C++ variables must be This error message indicates that the compiler has encountered a variable name . using char c = '\n'; Similar errors can occur with misuse of the macro NULL.

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sttty说的是，添加stdio.h 确实能解决问题，NULL在很多头文件中声明，其中就包括STDIO.H 但是linux是不是默认添加这个头文件呢？...

sttty说的是，添加stdio.h 确实能解决问题，NULL在很多头文件中声明，其中就包括STDIO.H 但是linux是不是默认添加这个头文件呢？因为即使不.

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I am developing a double linked list in C (development environment) is QT #...

I am developing a double linked list in C (development environment) is QT #ifndef NULL #define NULL 0 #endif #ifdef __cplusplus extern "C" 'NODE' undeclared (first use in this function) same happens in Netbeans IDE, interesting thing is if change the source file from c to cpp the error goes away.

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in bold): bbftpd_list.c error: use of undeclared identifier 'NULL'...

in bold): bbftpd_list.c error: use of undeclared identifier 'NULL' bbftpd_list.c warning: implicit declaration of function 'free' is.

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J'utilise Dev-C++, j'ai créer une fonction dans un fichier annexe...

J'utilise Dev-C++, j'ai créer une fonction dans un fichier annexe à mon "main.c", si je tente `NULL' undeclared (first use in this function).

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et puis j'ai décidé de séparer le main.c (trop long) en plusieurs autr...

et puis j'ai décidé de séparer le main.c (trop long) en plusieurs autres.c (dont me renvoit: 'NULL' undeclared (forst used in this function) o_O.

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fsevent_sleep.c error: expected ';' before 'pathsToWatch...

fsevent_sleep.c error: expected ';' before 'pathsToWatch'. fsevent_sleep.c error: 'NULL' undeclared (first use in this function). fsevent_sleep.c error.

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fmq_msg.c error: 'NULL' undeclared (first use in this function) f...

fmq_msg.c error: 'NULL' undeclared (first use in this function) fmq_msg.c: At top level: fmq_msg.c error: unknown type name.

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