Can variables be declared?

Does a variable have to be declared?

Every variable must be declared, indicating its data type, before it can be used. Declaration can also involve explicit initialization, giving the variable a value; a variable that is declared but not explicitly initialized is of uncertain value (and should be regarded as dangerous until it is initialized).

What is variable how it is declared?

Declaration of a variable in a computer programming language is a statement used to specify the variable name and its data type. Declaration tells the compiler about the existence of an entity in the program and its location. When you declare a variable, you should also initialize it.

Where is a variable declared?

A scope is a region of the program and broadly speaking there are three places, where variables can be declared: Inside a function or a block which is called local variables, In the definition of function parameters which is called formal parameters. Outside of all functions which is called global variables.

Can you declare a variable in a function?

Variables that are declared inside a function or block are called local variables. They can be used only by statements that are inside that function or block of code. Local variables are not known to functions outside their own.