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1. Top results related to where can a function be defined in c programming

   • Can a static function be called through a function pointer in C?

     Top Answer

     Answered Nov 05, 2011 · 42 votes

     Yes, you can export static functions by handing out pointers to them. This is a common means of implementing the Factory pattern in C, where you can hide the implementations of a whole bunch of functions from the modules that use them, and have a FuncPtr_t GetFunction( enum whichFunctionIWant) that hands them out to consumers. That's how many dynamic linking implementations work.

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     Answered Nov 05, 2011 · 11 votes

     However, if I somehow manage to get a pointer to this function into another file, can I then call this function from that file.

     Yes, it's perfectly possible. The function isn't visible to the linker, but it's there in the executable. You can always jump to its address.

     I am not sure about scenarios though. Maybe you want others to only call your function after they called some other function (non-static of course). So you have them obtain it, and then they can call it.

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     Answered Nov 05, 2011 · 6 votes

     As the other mentioned, you can do it. An example of why you might want to is for some sort of "driver". You might pass back a structure containing the open, close, read, and write functions without having to make the actual functions publicly accessible.

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     1/5

   • Can a script be set as a parameter of a function in c# Unity?

     Top Answer

     Answered Mar 03, 2023 · 1 votes

     That's OOP basics - In such a case you have mainly two options:

     You should have

     public interface IDamageable{ void TakeDamage(float damage);}

     public class PlayerAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm a player and do a certain thing when I take {damage} amount of damage"); }}public class EnemyAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm an enmy and do something completely different when I take {damage} amount of damage"); }}

     // Careful with this naming in that case!public class Damageable : MonoBehaviour{ virtual void TakeDamage(float damage) { Debug.Log("This is the common default behavior for my inheritors - except the overwrite or extend it"); }}

     public class PlayerAnimator : Damageable { public override void TakeDamage(float damage) { // First call the default implementation base.TakeDamage(damage); Debug.Log($"I'm a player and do some additional stuff"); }}public class EnemyAnimator : Damageable { public override void TakeDamage(float damage) { Debug.Log($"I'm an enmy and decided to not do the default thing but something completely different"); }}

     • an interface if it is only about having the same method signatures but completely different behavior public interface IDamageable{ void TakeDamage(float damage);}And then public class PlayerAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm a player and do a certain thing when I take {damage} amount of damage"); }}public class EnemyAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm an enmy and do something completely different when I take {damage} amount of damage"); }}
     • go through inheritance and have a common parent class which already implements common behavior and can then be extended - if needed at all // Careful with this naming in that case!public class Damageable : MonoBehaviour{ virtual void TakeDamage(float damage) { Debug.Log("This is the common default behavior for my inheritors - except the overwrite or extend it"); }}and public class PlayerAnimator : Damageable { public override void TakeDamage(float damage) { // First call the default implementation base.TakeDamage(damage); Debug.Log($"I'm a player and do some additional stuff"); }}public class EnemyAnimator : Damageable { public override void TakeDamage(float damage) { Debug.Log($"I'm an enmy and decided to not do the default thing but something completely different"); }}Here if you don't need any different behavior between EnemyAnimator and PlayerAnimator the answer would be easy: Just stick to a single class then!

     And then I would go

     public void Attack(){ _animator.SetTrigger("Attack");- var hitEnemies = Physics2D.OverlapCircleAll(_attackPoint.position, _attackRange, _enemyLayer); foreach (Collider2D enemy in hitEnemies) { // OPTION A if(enemy.TryGetComponent<IDamagable>(out var damageable)) // or OPTION B //if(enemy.TryGetComponent<Damagable>(out var damageable)) { damageable.TakeDamage(_attackDamage) } }}

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     2/5

   • Where Isolate can be defined in Flutter? How to start a thread in Flutter?

     Top Answer

     Answered Mar 17, 2021 · 3 votes

     You should read https://dev.to/alphamikle/why-should-you-use-isolates-in-flutter-1k5o, and look at package:isolates.

     The article contrasts using main thread, compute, Isolate proper, and the isolates package, with advantages and disadvantages of each. Best article I've seen in a long time.

     Also keep in mind, Java threads are data-shared, leading to possible deadlocks. Dart isolates are share-nothing, using "ports" to carefully move data between isolates, and no need for locking!

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     3/5

   • In how many ways can a function be invoked(called) in C++?

     Top Answer

     Answered Feb 24, 2015 · 2 votes

     Arbitrary functions can be invoked:

     • using f(arguments...) notation
     • via a pointer to the function (whether member or non-)
     • via a std::function - (will check the implementation's left unspecified, though I'd expect it to use a pointer to function or pointer to member function under the covers so no new language features)

     Class-specific functions are also invoked in certain situations:

     • constructors are invoked when objects are created on the stack, and when static/global or thread-specific objects or dynamically-allocated objects are dynamically initialised, or with placement new , and as expressions are evaluated
     • destructors are invoked when objects leave scope, are delete d, threads exit, temporaries are destroyed, and when the destructor is explicitly called ala x.~X()
     • all manner of operators ( [] , += , == , < etc.) may be invoked during expression evaluation

     Arbitrary non-member functions may be run by:

     • functions may be run due to earlier std::atexit() or std::at_quick_exit() calls, and if they throw std::terminate may run
     • thread creation and asynchronous signals (again the interfaces accept pointer to functions, and there's no reason to think any implementation has or would use any other technique to achieve dispatch)

     Specific functions are triggered in very specific situations:

     • main() is executed by the runtime
     • std::unexpected , std::unexpected_handler , std::terminate are invoked when dynamic exception specifications are violated

     It's also possible to use setjmp and longjmp to "jump" back into a function... not quite the same thing as calling it though.

     Though not truly "C++", it's also possible to arrange function execution using inline assembly language / linked assembler, writing to executable memory.

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     4/5

   • (C Programming) How do I use a data structure and function which are defined in another file?

     Top Answer

     Answered Feb 26, 2019 · 0 votes

     You forgot the return statement

     struct ourTable establishTable(){ struct ourTable table = createTable(1000); // Create a table with a maximum of 1000 entries. addEntry(&table, "word", 1234); return table;}

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     5/5

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2. www.freecodecamp.org › news › how-to-define-aDef in C – How to Define a Function in C - freeCodeCamp.org

   www.freecodecamp.org › news › how-to-define-a

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   Apr 12, 2024 · Functions play a fundamental role in programming in C. They allow you to write code that is organized and easier to maintain. In this article, you'll learn the basics of defining functions in C. What is a Function in C? In programming, a function is ...

3. www.geeksforgeeks.org › c-functionsC Functions - GeeksforGeeks

   www.geeksforgeeks.org › c-functions

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   • Video Duration: 3 min

   • Syntax of Functions in C. The syntax of function can be divided into 3 aspects: Function Declaration. Function Definition. Function Calls.
   • Function Declarations. In a function declaration, we must provide the function name, its return type, and the number and type of its parameters. A function declaration tells the compiler that there is a function with the given name defined somewhere else in the program.
   • Function Definition. The function definition consists of actual statements which are executed when the function is called (i.e. when the program control comes to the function).
   • Function Call. A function call is a statement that instructs the compiler to execute the function. We use the function name and parameters in the function call.

4. www.guru99.com › c-functionsFunctions in C Programming with Examples: Recursive & Inline

   www.guru99.com › c-functions

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   Feb 3, 2024 · A function call can be optional in a program. C program has at least one function; it is the main function (). Each function has a name, data type of return value or a void, parameters. Each function must be defined and declared in your C program.

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5. www.makeuseof.com › c-functions-introductionAn Introduction to C Functions - MUO

   www.makeuseof.com › c-functions-introduction

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   Aug 26, 2023 · In C programming, a function is a named section of code that does something when you ask it to. It helps keep your code organized and lets you use the same action multiple times without repeating yourself. The simplest example is one you’ve already been using: the main () function.

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6. www.henryharvin.com › blog › functions-in-c-programmingA Detailed Guide on Functions in C Programming

   www.henryharvin.com › blog › functions-in-c-programming

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   Aug 4, 2023 · A function is a collection of instructions denoted by a set of curly brackets () that accept inputs, perform calculations, and output the results. C programming supports modularity and reuse by enabling many calls to the same function.

7. www.mycplus.com › tutorials › c-programmingFunctions in C Programming with Examples, Structure and Types

   www.mycplus.com › tutorials › c-programming

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   Feb 11, 2024 · A function in C is a block of code (program statements) that has a name and has a reusable property i.e. it can be executed from as many different points in a C Program as required. We can formally define a function as: Function groups a number of program statements into a unit and gives it a name.

8. People also ask

   Where can a function be defined in C?

   • In C, a function can be defined anywhere in the program, as long as it is defined before it is used. But it is a good practice to define functions at the beginning of the file or in a separate file to make the code more readable and organized.

   How to Use Functions in C - Explained With Examples - freeCodeCamp.…

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   What is a function_name in C?

   • It can be any valid C data type such as int, float, char, or void if the function doesn’t return a value. The function_name is the name you give the function. It should be meaningful and accurately describe what the function does. You will later use this to call the function. The parameter is optional.

   Def in C – How to Define a Function in C - freeCodeCamp.org

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   What is a main function in C?

   • The main () function in C is a starting point of a program. In ‘C’ programming, functions are divided into two types: The difference between the library and user-defined functions in C is that we do not need to write a code for a library function. It is already present inside the header file which we always include at the beginning of a program.

   Functions in C Programming with Examples: Recursive & Inline - Guru99

   www.guru99.com/c-functions.html

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   What is an example of a function in C?

   • The simplest example is one you’ve already been using: the main () function. The main function is particularly special because it acts as the main entry point for any C program.

   An Introduction to C Functions - MUO

   www.makeuseof.com/c-functions-introduction/

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