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.”
What is void data type?
What is void data type give an example?
What is void data type and three uses?
What is meant by typedef in C?
typedef is a reserved keyword in the programming languages C and C++. It is used to create an additional name (alias) for another data type, but does not create a new type, except in the obscure case of a qualified typedef of an array type where the typedef qualifiers are transferred to the array element type.
What is header file in C?
A header file is a file with extension . h which contains C function declarations and macro definitions to be shared between several source files. There are two types of header files: the files that the programmer writes and the files that comes with your compiler.
How do you declare a character in C?
In order to declare a variable with character type, you use the char keyword followed by the variable name. The following example declares three char variables. char ch; char key, flag;. In this example, we initialize a character variable with a character literal.
What characters are allowed in C function identifier?
A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores. The first letter of an identifier should be either a letter or an underscore. You cannot use keywords like int , while etc. as identifiers.
How do you create a struct in C++?
To create a structure, use the struct keyword and declare each of its members inside curly braces.
How can you declare and define a pointer variable?
You can declare a pointer to a structure, union, or enumeration type before you define the structure, union, or enumeration type. You declare the pointer by using the structure or union tag as shown in the examples below.
How do you define Iostream in C++?
iostream: iostream stands for standard input-output stream. This header file contains definitions of objects like cin, cout, cerr, etc. iomanip: iomanip stands for input-output manipulators. The methods declared in these files are used for manipulating streams.
How do you create a string in Java?
- By string literal : Java String literal is created by using double quotes. For Example: String s=“Welcome”;
- By new keyword : Java String is created by using a keyword “new”. For example: String s=new String(“Welcome”);
- By string literal : Java String literal is created by using double quotes. For Example: String s=“Welcome”;
- By new keyword : Java String is created by using a keyword “new”. For example: String s=new String(“Welcome”);
How do you display a string in Python?
Strings in python are surrounded by either single quotation marks, or double quotation marks. ‘hello’ is the same as “hello”.
What is difference between keyword and identifier?
In general, keywords are the predefined and specific reserved words, which hold special meaning. On the other hand, an identifier is a different term or name given to a variable, label of class in the program or function.
Can a function start with a number C++?
We can not specify the identifier which starts with a number because there are seven phases of compiler as follows. None of above supports that a variable starts with a number. This is because the compiler gets confused if is a number or identifier until it reaches an alphabet after the numbers.
What is a typedef C++?
The typedef keyword allows the programmer to create new names for types such as int or, more commonly in C++, templated types–it literally stands for “type definition”. Typedefs can be used both to provide more clarity to your code and to make it easier to make changes to the underlying data types that you use.
What is member function C++?
Member functions are operators and functions that are declared as members of a class. Member functions do not include operators and functions declared with the friend specifier. These are called friends of a class. You can declare a member function as static ; this is called a static member function.
What is initialization in C?
Initialization is the process of locating and using the defined values for variable data that is used by a computer program. For example, an operating system or application program is installed with default or user-specified values that determine certain aspects of how the system or program is to function.
How do you print something in C++?
Std::cout is the preferred way to print a string in C++.