Implicit Declaration Of Function In C Error

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Error Implicit Declaration Of Function Create_proc_entry

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How To Fix Implicit Declaration Of Function

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Implicit Declaration Of Function Warning In C

takes a minute: Sign up How do i fix this error? warning: implicit declaration of function ‘main_menu’ up vote 2 down vote favorite this is a b-day reminder code utilizing linkedlists typedef struct node { char name[61]; int month; int day; int year; struct node *next; }node; this is the list typedef struct list { node *head; node *tail; }list; this werror=implicit-function-declaration is the create list code list *create_list(list *plist) { plist->head = NULL; plist->tail = NULL; return plist; } this inserts the node created to the list list *insert_list(list *plist, node *pnode, node *new_node) { new_node->next = pnode->next; pnode->next = new_node; if (plist->tail == pnode) { plist->tail = new_node; } } this is the add birthday menu void add_birthday(list *List) { char x; node *data = (node *) malloc(sizeof(node)); List = (list*) malloc(sizeof(list)); printf("******************************************************************\n"); printf(" ADD BIRTHDAY REMINDER FORM\n"); printf("******************************************************************\n"); List = insert_list(List, data, create_node(data)); printf("Would you like to add another(y/n)?\n"); scanf("%c", &x); if (x=='y') { while (x=='y') { if (x=='y') { getchar(); printf("******************************************************************\n"); node *data = (node *) malloc(sizeof(node)); List = insert_list(List, data, create_node(data)); printf("Would you like to add another(y/n)?\n"); scanf("%c", &x); } } } main_menu(List); //the problem lies here } this is the main menu void main_menu(list* List) { int x; printf("Welcome to myCalendar version 1.0.0\n"); printf("Please input the number that you wish to do:\n"); printf("[1] Add Birthday Reminder\n"); printf("[2] Delete Birthday Reminder\n"); printf("[3] View Calendar\n"); printf("[4] Quit\n"); scanf("%d", &x); getchar(); switch (x) { case 1: add_birthday(List); break;

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack implicit declaration of function strcmp Overflow the company Business Learn more about hiring developers or posting ads with us nested extern declaration Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a implicit declaration of function gets community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up warning: implicit declaration of function up vote 80 down vote favorite 16 My compiler (GCC) http://stackoverflow.com/questions/9919169/how-do-i-fix-this-error-warning-implicit-declaration-of-function-main-menu is giving me the warning: warning: implicit declaration of function Please help me understand why is it coming. c compiler-warnings share|improve this question edited Dec 9 '11 at 3:51 Andrew Marshall 63.8k12134153 asked Dec 9 '11 at 3:49 Angus 2,961195496 A "why does it not give an error version": stackoverflow.com/questions/434763/… –Ciro Santilli 烏坎事件2016六四事件 法轮功 May 13 '15 at 7:27 add a comment| 6 Answers 6 active oldest votes up http://stackoverflow.com/questions/8440816/warning-implicit-declaration-of-function vote 103 down vote accepted You are using a function for which the compiler has not seen a declaration ("prototype") yet. For example: int main() { fun(2, "21"); /* The compiler has not seen the declaration. */ return 0; } int fun(int x, char *p) { /* ... */ } You need to declare your function before main, like this, either directly or in a header: int fun(int x, char *p); share|improve this answer edited Dec 9 '11 at 3:53 answered Dec 9 '11 at 3:50 cnicutar 122k13193256 6 As an addition if you have given the prototype check that it isn't just a typo. Also if its from an external library check that you have included it. –smitec Dec 9 '11 at 3:53 14 Why is this a warning and not an error? –Flimm Nov 21 '13 at 16:15 I cannot run the code after I get this warning. So it behaves like an error. –Mien Jan 21 '14 at 13:36 @Flimm, C99 and C89/C90 has different setting for this –How Chen Jan 15 '15 at 6:06 @Flimm stackoverflow.com/questions/434763/… –Ciro Santilli 烏坎事件2016六四事件 法轮功 May 13 '15 at 7:29 add a comment| up vote 8 down vote The right way is to de

Debugging with App Logs Debugging with GDB Design and Interaction Events and Services Graphics and Animations Migrating Older Apps Pebble Packages Pebble Timeline Smartstraps Tools and Resources User Interfaces Undeclared Variables Undeclared Functions Too Few Arguments Incorrect Callback https://developer.pebble.com/guides/debugging/common-syntax-errors/ Implementations Common Syntax Errors If a developer is relatively new to writing Pebble apps (or new to the C language in general), there may be times when problems with an app's code will cause compilation errors. Some types of errors with the code itself can be detected by the compiler and this helps reduce the number that cause problems when the code is run on Pebble.These are problems with how implicit declaration app code is written, as opposed to runtime errors (discussed in Common Runtime Errors), which may include breaking the rules of the C language or bad practices that the compiler is able to detect and show as an error. The following are some examples.Undeclared VariablesThis error means that a variable that has been referenced is not available in the current scope.../src/main.c: In function 'toggle_logging': ../src/main.c:33:6: error: 'is_now_logging' undeclared (first implicit declaration of use in this function) if(is_now_logging == true) { ^ In the above example, the symbol is_now_logging has been used in the toggle_logging function, but it was not first declared there. This could be because the declaring line has been deleted, or it was expected to be available globally, but isn't. To fix this, consider where else the symbol is required. If it is needed in other functions, move the declaration to a global scope (outside any function). If it is needed only for this function, declare it before the offending line (here line 33).Undeclared FunctionsAnother variant of the above problem can occur when declaring new functions in a code file. Due to the nature of C compilation, any function a developer attempts to call must have been previously encountered by the compiler in order to be visible. This can be done through forward declaration.For example, the code segment below will not compile:static void window_load(Window *window) { my_function(); } void my_function() { // Some code here } The compiler will report this with an 'implicit declaration' error, as the app has implied the function's existence by calling it, even though the compiler has not seen it previously:../src/function-visibility.c: In function 'window_load': ../src/function-visibility.c:6:3: error: implicit declaration of function 'my_function' [-Werror=implicit-function-decl