How To Declare Variables In Dev C++

Hello: Is it possible to declare a variable with multiple data types. For example in my program I would like to declare my variable as int or char depending on the situation the variable is in as an example. Scope of a variable is the part of the program where the variable is accessible. Like C/C, in Java, all identifiers are lexically (or statically) scoped, i.e.scope of a variable can determined at compile time and independent of function call stack.

1. C++ Declare A String
2. Declare Variable Java

A variable in simple terms is a storage place which has some memory allocated to it. Basically, a variable used to store some form of data. Different types of variables require different amounts of memory, and have some specific set of operations which can be applied on them.

Variable Declaration:
A typical variable declaration is of the form:

A variable name can consist of alphabets (both upper and lower case), numbers and the underscore ‘_’ character. However, the name must not start with a number.

Difference b/w variable declaration and definition
Variable declaration refers to the part where a variable is first declared or introduced before its first use. Variable definition is the part where the variable is assigned a memory location and a value. Most of the times, variable declaration and definition are done together.

See the following C program for better clarification:

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You will use the keyword extern to declare a variable at any place. Though you can declare a variable multiple times in your C program, it can be defined only once in a file, a function, or a block of code. Try the following example, where variables have been declared at the top, but they have been defined and initialized inside the. I'm fairly new to C, and was just wondering how to declare a word variable. For example, while. Int variable; is able to hold only an interger value, I would like to be able to declare a variable that can hold a word, or string, e.g. Variables of this type are able to store sequences of characters, such as words or sentences. A very useful feature! A first difference with fundamental data types is that in order to declare and use objects (variables) of this type, the program needs to include the header where the type is defined within the standard library (header ).

Jun 25, 2003  To declare the variable 'age,' simply type the data type (int) in front of it. Notice that you can specify the type of data you want the function main to return. This next program uses a few more variables. It retrieves the user's age, as well as their height, weight, hair color, and eye color. These are two valid declarations of variables. The first one declares a variable of type int with the identifier a. The second one declares a variable of type float with the identifier mynumber. Once declared, the variables a and mynumber can be used within the rest of their scope in the program.

Output:

Is it possible to have separate declaration and definition?
It is possible in case of extern variables and functions. See question 1 of this for more details.

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Keywords are specific reserved words in C each of which has a specific feature associated with it. Almost all of the words which help us use the functionality of the C language are included in the list of keywords. So you can imagine that the list of keywords is not going to be a small one!

There are a total of 32 keywords in C:

Most of these keywords have already been discussed in the various sub-sections of the C language, like Data Types, Storage Classes, Control Statements, Functions etc.

Let us discuss some of the other keywords which allow us to use the basic functionality of C:

const: const can be used to declare constant variables. Constant variables are variables which, when initialized, can’t change their value. Or in other words, the value assigned to them cannot be modified further down in the program.
Syntax:

C++ Declare A String

Note: Constant variables must be initialized during their declaration. const keyword is also used with pointers. Please refer the const qualifier in C for understanding the same.

extern: extern simply tells us that the variable is defined elsewhere and not within the same block where it is used. Basically, the value is assigned to it in a different block and this can be overwritten/changed in a different block as well. So an extern variable is nothing but a global variable initialized with a legal value where it is declared in order to be used elsewhere. It can be accessed within any function/block. Also, a normal global variable can me made extern as well by placing the ‘extern’ keyword before its declaration/definition in any function/block. This basically signifies that we are not initializing a new variable but instead we are using/accessing the global variable only. The main purpose of using extern variables is that they can be accessed between two different files which are part of a large program.
Syntax:

static: static keyword is used to declare static variables, which are popularly used while writing programs in C language. Static variables have a property of preserving their value even after they are out of their scope! Hence, static variables preserve the value of their last use in their scope. So we can say that they are initialized only once and exist till the termination of the program. Thus, no new memory is allocated because they are not re-declared. Their scope is local to the function to which they were defined. Global static variables can be accessed anywhere within that file as their scope is local to the file. By default, they are assigned the value 0 by the compiler.
Syntax:

void: void is a special data type. But what makes it so special? void, as it literally means, is an empty data type. It means it has nothing or it holds no value. For example, when it is used as the return data type for a function it simply represents that the function returns no value. Similarly, when its added to a function heading, it represents that the function takes no arguments.
Note: void also has a significant use with pointers. Please refer to the void pointer in C for understanding the same.

typedef: typedef is used to give a new name to an already existing or even a custom data type (like a structure). It comes in very handy at times, for example in a case when the name of the structure defined by you is very long or you just need a short-hand notation of a per-existing data type.

Let’s implement the keywords which we have discussed above. Take a look at the following code which is a working example to demonstrate these keywords:

Output:

Declare Variable Java