C variable and Datatypes

C language Tutorial with programming approach for beginners and professionals, helps you to understand the C language tutorial easily. Our C tutorial explains each or every topic with example.

The C programing language is a procedural and general- purpose language that rovides low-level access to System memory is knows as C programming language.

Variable in C

A variable is a name of the memory location. It is use to store data. Its value can be change, and it can be reused many time is knows as Variable in C.

Syntax

• type variable_list;  

Rules for defining variables

1. A variable can have alphabets, underscore or digits.
2. A variable name can start with the alphabet, and underscore only.
3. It can not start with a digit.
4. No whitespace is allow within the variable name.
5. A variable name must not be any reserve word or keyword.

Types of Variables in C

There are some important types of variables in c

• local variable
  • Declare inside the function
• global variable
  • Declare outside the function
• static variable
  • Declare with the static keyword
• automatic variable
  • Declare inside the block, are automatic variables by default
• external variable

Simple example of Variables Declaration in C

Input value

#include <stdio.h>
extern int a, b;
extern int c;
extern float f;

int main () {

   int a, b;
   int c;
   float f;

   a = 45;
   b = 25;
  
   c = a + b;
   printf("value of c : %d \n", c);

   f = 72.0/3.0;
   printf("value of f : %f \n", f);
 
   return 0;
}

Output value

DATATYPES

A data type specifies the type of data that a variable can store just like as integer, floating, character, etc. is knows as DataTypes in C programming language.

TYPES OF DATATYPES

Basic Data Type

• int
• char
• float
• double

Derived Data Type

• array
• pointer
• structure
• union

Enumeration Data Type

• enum

VOID

• Void

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