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When used as a function return type, the void keyword specifies that the function does not 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.'
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If a pointer's type is void*, the pointer can point to any variable that is not declared with the const or volatile keyword. A void* pointer cannot be dereferenced unless it is cast to another type. A void* pointer can be converted into any other type of data pointer.
A void pointer can point to a function, but not to a class member in C++.
- May 30, 2017 Difference between int main and void main and main Like any other function, main is also a function but with a special characteristic that the program execution always starts from the ‘main’. ‘int’ and ‘void’ are its return type.
- Dec 03, 2016 please friends like,share,and comment this video. If you have any query then comment me please. Please don't forget for subscribe.
- Source should compile and run with a void main. However, main's exit value will then always be 0 and therefore useless to test for a certain execution completion status. Alexsandro Meireles wrote: Hi, all! I tried to use the following expression in Dev-C void main (void) The compiler give a warning message 'output of main is.
If-else Statement (C); 2 minutes to read +2; In this article. Controls conditional branching. Statements in the if-block are executed only if the if-expression evaluates to a non-zero value (or TRUE). If the value of expression is nonzero, statement1 and any other statements in the block are executed and the else-block, if present, is skipped. If the value of expression is zero.
You cannot declare a variable of type void.
Example
See also
Void Main In C
How To Use Void Main In Dev C Youtube
Keywords
Built-in types
-->Built-in types
Controls conditional branching. Statements in the if-block are executed only if the if-expression evaluates to a non-zero value (or TRUE). If the value of expression is nonzero, statement1 and any other statements in the block are executed and the else-block, if present, is skipped. If the value of expression is zero, then the if-block is skipped and the else-block, if present, is executed. Expressions that evaluate to non-zero are
- TRUE
- a non-null pointer,
- any non-zero arithmetic value, or
- a class type that defines an unambiguous conversion to an arithmetic, boolean or pointer type. (For information about conversions, see Standard Conversions.)
Syntax
Example
if statement with an initializer
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Visual Studio 2017 version 15.3 and later (available with /std:c++17): An if statement may also contain an expression that declares and initializes a named variable. Use this form of the if-statement when the variable is only needed within the scope of the if-block.
Example
In all forms of the if statement, expression, which can have any value except a structure, is evaluated, including all side effects. Control passes from the if statement to the next statement in the program unless one of the statements contains a break, continue, or goto.
The else clause of an
if...else
statement is associated with the closest previous if statement in the same scope that does not have a corresponding else statement.if constexpr statements
Visual Studio 2017 version 15.3 and later (available with /std:c++17): In function templates, you can use an if constexpr statement to make compile-time branching decisions without having to resort to multiple function overloads. For example, you can write a single function that handles parameter unpacking (no zero-parameter overload is needed):
Void Main Vs Int Main
See also
Void Main In Dev C++
Selection Statements
Keywords
switch Statement (C++)
Keywords
switch Statement (C++)