Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Explain the variable declaration, initialization and assignment in C language
The main purpose of variables is to store data in memory. Unlike constants, it will not change during the program execution. However, its value may be changed during execution.
The variable declaration indicates that the operating system is going to reserve a piece of memory with that variable name.
Variable declaration
The syntax for variable declaration is as follows −
type variable_name;
or
type variable_name, variable_name, variable_name;
For example,
iInt a,b; float c; double d;
Here, a, b, c, d are variables. The int, float, double are the data types.
Variable initialization
The syntax for variable initialization is as follows −
data type variablename=value;
For example,
int width, height=20; char letter='R'; float base, area; //variable declaration double d; /* actual initialization */ width = 10; area = 26.5;
Variable Assignment
A variable assignment is a process of assigning a value to a variable.
For example,
int height = 40; int base = 31;
Rules for defining variables
A variable may be alphabets, digits, and underscore.
A variable name can start with an alphabet, and an underscore but, can’t start with a digit.
Whitespace is not allowed in the variable name.
A variable name is not a reserved word or keyword. For example, int, goto etc.
Example
Following is the C program for variable assignment −
#include <stdio.h>
int main (){
/* variable definition: */
int a, b;
int c;
float f;
/* actual initialization */
a = 40;
b = 50;
c = a + b;
printf("value of c : %d
", c);
return 0;
}Output
When the above program is executed, it produces the following result −
Value of c: 90
8K+ Views
