What is void function? void (C++)
When used as a function return type, the void keyword specifies that the function doesn't return a value. When used for a function's parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is "universal."
Then, What return type is void?
The void type, in several programming languages derived from C and Algol68, is the type for the result of a function that returns normally, but does not provide a result value to its caller. Usually such functions are called for their side effects, such as performing some task or writing to their output parameters.
Likewise, What is void * in C#? The void keyword is used in method signatures to declare a method that does not return a value. A method declared with the void return type cannot provide any arguments to any return statements they contain.
Nevertheless, What does return mean in Visual Basic?
In visual basic, the Return statement is useful to terminate the execution of the method in which it appears and return the control back to the calling method. Generally in visual basic, the Return statement is useful whenever we want to get some value from the other methods.
What is void display?
void display; () is not a function declaration; void display (void) is called function prototyping and the "void" in the arguments list tells the compiler that there are no arguments . The (void) Is pretty old and was used in c; today in c++ we simply leave it empty like this void display ();
Related Question for What Is Void Function?
Why is void main used?
The void main() indicates that the main() function will not return any value, but the int main() indicates that the main() can return integer type data. When our program is simple, and it is not going to terminate before reaching the last line of the code, or the code is error free, then we can use the void main().
What is void data type?
The void data type has no values and no operations. It's a data type that represents the lack of a data type. The void data type is typically used in the definition and prototyping of functions to indicate that either nothing is being passed in and/or nothing is being returned.
What is void pointer?
A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type. Some Interesting Facts: 1) void pointers cannot be dereferenced. For example the following program doesn't compile.
What are void methods?
The void keyword allows us to create methods which do not return a value. This method is a void method, which does not return any value. Call to a void method must be a statement i.e. methodRankPoints(255.7);.
What does void mean in AC method?
It means "no value". You use void to indicate that a function doesn't return a value or that it has no parameters or both.
What is Boolean in VB net?
Use the Boolean Data Type (Visual Basic) to contain two-state values such as true/false, yes/no, or on/off. The default value of Boolean is False . Boolean values are not stored as numbers, and the stored values are not intended to be equivalent to numbers.
What is inheritance in VB net?
Inheritance is the idea that one class, called a subclass, can be based on another class, called a base class. Inheritance provides a mechanism for creating hierarchies of objects. For example, a dog is a mammal and a collie is a dog.
How do you end a sub in VBA?
In VBA, you can exit a Sub or Function, by using the Exit Sub or Exit Function commands. When the execution of the code comes to Exit Sub or Exit Function, it will exit a Sub or Function and continue with any other code execution.
What is the use of void?
In computer programming, when void is used as a function return type, it indicates that the function does not return a value. When void appears in a pointer declaration, it specifies that the pointer is universal. When used in a function's parameter list, void indicates that the function takes no parameters.
Is void a data type?
Void is considered a data type (for organizational purposes), but it is basically a keyword to use as a placeholder where you would put a data type, to represent "no data".
What is void in Java?
void is a Java keyword. Used at method declaration and definition to specify that the method does not return any type, the method returns void .
What is a void variable?
Its a pointer to an undefined type. You can not dereference a void pointer, that is following on from you example. *Foo. Would cause a compiler error. Void pointers are useful when the type of a pointer can not be know or is not useful to know.
What does void main () mean?
Void main () is the entry point for execution in C program. The void is a keyword that represents function will not return anything but a void value. Main is the name of the function and () represents parameter list that can be passed to function in this case nothing is passed.
What does a void function return?
In lieu of a data type, void functions use the keyword "void." A void function performs a task, and then control returns back to the caller--but, it does not return a value. You may or may not use the return statement, as there is no return value.
Is void a basic data type?
character, integer, float, and void are fundamental data types. Pointers, arrays, structures and unions are derived data types. char, Signed char, Unsigned char. void is used where there is no return value required.
What is void in C with example?
Void is an empty data type that has no value. We use void data type in functions when we don't want to return any value to the calling function. Example: void sum (int a, int b); – This function won't return any value to the calling function.
How do you cout a void function?
You can not cout the result of a void function or cast the void to something to be used on the cout , since there is nothing being returned.
What is the void pointer and why use?
A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type. Note that the above program compiles in C, but doesn't compile in C++. In C++, we must explicitly typecast return value of malloc to (int *).
Where is void pointer used?
The void pointer in C is a pointer which is not associated with any data types. It points to some data location in the storage means points to the address of variables. It is also called general purpose pointer. In C, malloc() and calloc() functions return void * or generic pointers.
What is a void pointer and a null pointer?
A null pointer points has the value NULL which is typically 0, but in any case a memory location which is invalid to dereference. A void pointer points at data of type void. The word "void" is not an indication that the data referenced by the pointer is invalid or that the pointer has been nullified.
How do you write a void function?
A void function has a heading that names the function followed by a pair of parentheses. The function identifier/name is preceded by the word void. The parameter list with the corresponding data type is within the parentheses. The body of the function is between the pair of braces.
What is true of a void method?
What is true of a void method? It returns no value.
Do void methods take parameters?
You can use any name you want for methods, except main or any of the Java keywords. And they are both void , which means that they don't yield a result (unlike the Math methods, for example). The parentheses after the method name contain a list of variables, called parameters, where the method stores its arguments.
What is void in asp net?
You use void as the return type of a method (or a local function) to specify that the method doesn't return a value. You cannot use void as the type of a variable.
What does the word void?
Definition of void (Entry 2 of 3) 1a : opening, gap. b : empty space : emptiness, vacuum. 2 : the quality or state of being without something : lack, absence. 3 : a feeling of want or hollowness.
What is the size of void data type?
If the system is 32-bit, size of void pointer is 4 bytes. If the system is 64-bit, size of void pointer is 8 bytes.
What can I use instead of void?
Synonyms & Antonyms of void
Should I use void?
void pointers should be used any time the contents of a block of data is not important. For functions that operate on blocks of memory without needing to understand the contents using void pointers clarifies the design to users so that they know the function does not care for any data format.
Should I use void or int?
when you use void, it means you don't want anything returned from the function. while an int return may be a result of calculation in the function, or indicate the status when it returning, such as an error number or something else that can tell you what has happened when the function executing.
What is the difference between static and void?
static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating an object of the class. void means that the method has no return value.
What is the difference between public and void?
public is an access specifier. void is a return type, or more specifically the lack of a return type.
Was this helpful?
0 / 0