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Variables and its Types in C
Language
1. What is a Variable in C?
A variable in C is a named location in memory where data is stored. It acts as a container to hold values that may change during the execution of a program.
Key Points:
Each variable must have a unique name (called an identifier).
Variables must be declared before use.
They store data of specific types (like int, float, char, etc.).
2. Syntax of Variable Declaration:
data_type variable_name;
Example:
int age; float price; char grade;
3. Types of Variables in C
Variables in C can be categorized based on their scope (where they are accessible) and lifetime (how long they exist in memory). The two most common types are:
● Local Variables
● Global Variables
4. Local Variables
Definition:
Local variables are declared inside a function or a block (like inside main() or an if block). They are accessible only within that function or block.
Key Characteristics:
Scope : Limited to the function or block.
Lifetime : Exists only while the function is executing.
Automatically destroyed after the function ends.
Must be initialized before use.
Example:
#include <stdio.h>
void display() { int x = 10; // Local variable printf("Value of x: %d\n", x); }
int main() { display(); // printf("%d", x); // Error: x is not accessible here return 0; }
5. Global Variables
Definition:
- Can you use a local variable outside the function it is defined in?
- What happens if both local and global variables have the same name?
