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Error Prototype Declaration C

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Function Prototype Declaration In C

more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags why do we need prototype declaration in c Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, function prototype in c header file helping each other. Join them; it only takes a minute: Sign up function declaration isn't a prototype up vote 103 down vote favorite 25 I have a library I created, mylib.c: #include int testlib() { printf("Hello world\n");

Function Prototype In C Example

return (0); } mylib.h: #include extern int testlib(); In my program, I've attempted to call this library function: myprogram.c: #include int main (int argc, char *argv[]) { testlib(); return (0); } When I attempt to compile this program I get the following error: In file included from myprogram.c:1 mylib.h:2 warning: function declaration isn't a prototype I'm using: gcc (GCC) 3.4.5 20051201 (Red Hat 3.4.5-2) My question is, what is the proper way to declare a

Function Prototype In C Programming

function prototype? c gcc compiler-construction share|improve this question edited Dec 30 '13 at 16:21 Ryan Stein 5,03131232 asked Sep 3 '08 at 17:08 Alan H 1,06431316 1 Remove extern from the declaration in mylib.h Especially if you are writing a pure C program, the extern declaration is unnecessary there. –Ryan Ahearn Sep 3 '08 at 17:16 8 You don't need to #include in mylib.h. –pmg Oct 22 '09 at 7:59 add a comment| 3 Answers 3 active oldest votes up vote 222 down vote accepted In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing. I suggest that you use void consistently when you mean no arguments. If you have a variable a, extern int a; is a way to tell the compiler that a is a symbol that might be present in a different translation unit (C compiler speak for source file), don't resolve it until link time. On the other hand, symbols which are function names are anyway resolved at link time. The meaning of a storage class specifier on a function (extern, static) only affects its visibility and extern is the default, so extern is actually unnecessary. I suggest removing the extern, it is extraneous and is usually omitted. share|improv

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Werror=strict-prototypes

developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the no previous prototype for Stack Overflow 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 Function declaration isn’t a prototype in http://stackoverflow.com/questions/42125/function-declaration-isnt-a-prototype C up vote 2 down vote favorite I'm learning to write kernel modules for linux as a beginner. What I'm trying to do is to write every task and its child process into the kernel log using DFS algorithm. But when I compile the code using Makefile, it shows the above error: function declaration isn’t a prototype [-Werror=strict-prototypes] struct task_struct *current; It points out the task_struct http://stackoverflow.com/questions/32157741/function-declaration-isn-t-a-prototype-in-c keyword at the function DFS. Here's my code: # include # include # include # include # include void DFS (struct task_struct *task) { struct task_struct *current; struct list_head *list; list_for_each (list, &task->children) { current = list_entry(list, struct task_struct, sibling); printk(KERN_INFO "%d\t%d\t%s \n", (int)current->state, current->pid, current->comm); if (current != NULL) { DFS(current); } } } int DFS_init(void) { printk(KERN_INFO "Loading the Second Module...\n"); printk(KERN_INFO "State\tPID\tName\n"); DFS(&init_task); return 0; } void DFS_exit(void) { printk(KERN_INFO "Removing the Second Module...\n"); } Anyone knows how to fix this ?? EDIT I found the error. Seems like C doesn't allows to make a variable called *current. I changed it to another name and, it compiled !!! c compiler-errors linux-kernel share|improve this question edited Aug 22 '15 at 16:26 Gene 29.8k32757 asked Aug 22 '15 at 15:22 Sam 1,08821235 Why votedown ?? Can you explain ?? –Sam Aug 22 '15 at 15:30 3 C does allow current. Perhaps there's something in the headers you've included? –Karoly Horvath Aug 22 '15 at 15:53 9 In the kernel, current is a globally visible variable (pointer) pointing to the current process-table-entry. –wildplasser Aug 22 '15 at 16

For other uses, see Software prototyping. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and https://en.wikipedia.org/wiki/Function_prototype removed. (September 2016) (Learn how and when to remove this template message) In computer programming, a function prototype or function interface is a declaration of a function that specifies the function's name and type signature (arity, data types of parameters, and return type), but omits the function body. While a function definition specifies how the function does what it in c does (the "implementation"), a function prototype merely specifies its interface, i.e. what data types go in and come out of it. The term function prototype is particularly used in the context of the programming languages C and C++ where placing forward declarations of functions in header files allows for splitting a programm into translation units, i.e. into parts that a function prototype in compiler can separately translate into object files, to be combined by a linker into an executable or a library. In a prototype, parameter names are optional (and in C/C++ have function prototype scope, meaning their scope ends at the end of the prototype), however, the type is necessary along with all modifiers (e.g. if it is a pointer or a const parameter). In object-oriented programming, interfaces and abstract methods serve much the same purpose. Contents 1 Example 2 Uses 2.1 Creating library interfaces 2.2 Class declaration 3 See also 4 References Example[edit] Consider the following function prototypes: double myfunction(int n); This prototype specifies that in this program, there is a function named "myfunction" which takes a single integer argument "n" and returns a double. Elsewhere in the program a function definition must be provided if one wishes to use this function. It's important to be aware that a declaration of a function does not need to include any arguments. The following is an argument-less function declaration, which just declares the function name and its return type,

 

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