C Variables – Examples

 C Variables – Examples (Beginner → Practical)

In C language, a variable is used to store data (values) that can change during program execution.
Below are clear, practical examples of C variables, exactly as expected in exams, interviews, and real coding.

 Integer Variable Example

•  Stores whole numbers

 Float Variable Example

•  Stores decimal values

 Double Variable Example

•  Stores high-precision decimals

 Character Variable Example

•  Stores single character

 Multiple Variables Example

•  Multiple variables in one line

 Variable Declaration vs Initialization

or

• Both are valid

 Updating Variable Values

•  Variable value can change

 Variable with User Input

•  Value taken at runtime

 Variables in Expressions

•  Used in calculations

 Local vs Global Variable Example

•  Local → inside function
•  Global → outside function

Constant Variable Example

•  Value cannot change

 Variable with Pointer Example

•  Pointer accesses variable value indirectly

 Common Mistakes

•  Using uninitialized variables
•  Wrong format specifier
•  Forgetting & in scanf() 
•  Confusing variable name with value

 Interview Questions (Must Prepare)

1. What is a variable?

2. Difference between declaration and initialization

3. What is local and global variable?

4. Can variable value change during execution?

5. What is a constant variable?

 Summary

•  Variables store values in memory
•  Values can change during execution
•  Must be declared before use
•  Data type defines stored value
•  Essential for all C programs & interviews