? Variables in C

A variable is a name that stores a value — like a container in memory you can use and update.

? Syntax

c
type variableName = value;

Example:

c
Data Type
Description
Example
int
Integer
int x = 10;
float
Floating point number
float pi = 3.14;
char
Single character
char grade = 'A';
double
Double precision float
double d = 9.81;
char[]
String (array of chars)
char name[] = "Alice";
? Declaring Multiple Variables
c
int a = 5, b = 10, c;
? Rules for Naming Variables
Must start with a letter (or _)
Can contain letters, numbers, and underscores
Case-sensitive (age ? Age)
Avoid keywords (int, return, etc.)
? Example Program
c
#include <stdio.h>int main() {    int age = 20;    float gpa = 3.75;    char grade = 'A';    printf("Age: %d\n", age);    printf("GPA: %.2f\n", gpa);    printf("Grade: %c\n", grade);    return 0;}
? Tip:
Always initialize your variables — C doesn't automatically set them to zero!