Variable declaration in C program is an important topic. The below video provides a detailed view of the topic.
Table of Contents of Variable Declaration in C
In the following lesson, we will see the details about various data types along with variable declaration in C.
What are Data Types in the C Programming Language?
- Data types in the C programming language are declarations for variables.
- The data type contains a collection of data with fixed values.
- Data types are categorized based on the type of data a variable can store. The data type lets one know whether the associated variable is an integer, float, or character, etc.,
What are the Different Data Types in C?
-In the ‘C’ programming language, data types are primarily categorized into primitive and user-defined.
-While the primitive data type includes int, char, and float, the user-defined data type has an array and structure.
-The primitive data structure can store only one data type: int, float, or character.
-In contrast, the user-defined data structure can store different data types in a single entity.
-While an array is a collection of similar data types, a structure is a collection of dissimilar ones.
-Another difference lies in the way of memory allocation.
Whenever you declare the variables independently, as in primitive data type, the compiler or the operating system, based on the memory availability, will allocate those values at different memory locations of the RAM. In contrast, all the variables of an array will be stored consequently inside the memory.
How to Store Variables in C Program?
In C, we can store variables associated with different keywords, such as the int keyword, to store integers, whole numbers, or numbers without decimals, such as 1,2,3.
Float stores floating point numbers that include decimal numbers like 19.99.
Next, char: to store single characters, like A or ‘B.’
Based on the data type, the size differs.
In ‘int,’ it is 2 or 4 bytes.
Float, the size is 4 bytes.
Char can store a single letter, character, or ASCII value, and the size is 1 byte.
Variable in C Program: A Brief Introduction
What is a variable?
The process of assigning a name to the memory’s particular storage area involved in data manipulation of the program is known as a variable. Variables are containers that help to store data values such as numbers and characters.
What is the format of the syntax for variable declaration?
The syntax includes the associated data type along with the variableName, which equals the value; which Means the format consists of int a=5;
A brief overview of Data Members and Member Functions.
While the data variables are referred to as data members, the functions applied to the variables or data members to manipulate them are known as member functions.
For example, here, A, B, and C are data members, and the add function enclosed within the curly brackets is the member function.
Data members and member functions play an important role in object creation.
In programming languages such as Java, there is much importance for object creation. As such, these member functions and data members play an important role in object creation, as they define the behavior and properties of the object.
Member functions that define the logic operate on these values to give the output.
So, for example, if there is mention of x+y, it can only function if we assign values such as x=5 and y=7. With data, logic can do something.
As a result, functions use the data members to perform the logic.