C is a highly efficient programming language that was initially developed to write operating systems. It has many features that make it flexible and easy to use. It has low-level access to memory, a clean and concise style and a simplistic set of keywords. The source code written using C for one system can work effectively on another operating system without experiencing any changes.

Though C was developed as a programming language for UNIX operating systems, it now has many compilers that allow it to be used across almost all hardware platforms and operating systems. When it was first beginning to become popular, the American National Standards Institute, also known as ANSI, found it necessary to create a commercial standard for the programming language. Since then, it has also been approved by the International Standards Organisation and is now sometimes referred to as "ANSI C."

Here are a few important features of the C programming language:

• It offers functions and operators that are inbuilt. These can be used to solve all kinds of complex problems.

• C combines the functionality of both low-level and high-level languages.

• All operating systems can be used to write a C program.

• C provides great support in terms of the data types and operators it offers. These features make C programs very speedy.

• C is extendable.

• The libraries required to support the different functions and operators are provided by C itself.

C programming finds its application across industries and can be used in many ways, such as:

• In embedded systems

• For the development of system applications

• For the development of desktop applications

• For the development of a majority of Adobe applications

• For the development of browsers and the different extensions for these browsers

• In the development of databases like MySQL

• In the development of operating systems

• To produce compilers

• In IoT-related applications

As one of the foundational languages in programming, C is used more widely than other interpreted languages, such as PHP and Ruby. Learning C will time, but the benefits are worth the effort. Here are some of the primary advantages of learning C.

A variable is a name of the memory location. It is used to store data. Its value can be changed, and it can be reused many times.

It is a way to represent memory location through symbol so that it can be easily identified.

Example:

int a;  

float b;  

char c;

Here, a, b, c are variables. The int, float, char are the data types.

• A variable can have alphabets, digits, and underscore.

• A variable name can start with the alphabet, and underscore only. It can't start with a digit.

• No whitespace is allowed within the variable name.

• A variable name must not be any reserved word or keyword, e.g. int, float, etc.

1. local variable

2. global variable

3. static variable

4. automatic variable

5. external variable

Single-line comments start with two forward slashes ( // ). Any text between // and the end of the line is ignored by the compiler (will not be executed).

multi lines of code in any C/C++ editor view. The leading characters // are added to the beginning of each line when commenting one or more lines of code. You can also block comment multiple lines of code using the characters (/* */ ).

#include<stdio.h>

#include<conio.h>

void main()

{

clrscr();

getch();

}