C++ Variables

📦 C++ Variables – Declare, Initialize, and Use

Variables are like containers or boxes in your computer’s memory where you store stuff — like names, scores, or even the meaning of life (which is 42, obviously 😄).

🔹 What is a Variable?

A variable:

  • Has a name
  • Stores a value
  • Has a data type

Example: If you say int age = 25;, you’re creating a variable called age that stores an integer value 25.

🧪 Syntax of Variable Declaration

data_type variable_name = value;

You can also declare without assigning a value right away:

data_type variable_name;

🔧 Example: C++ Variable Declaration

#include <iostream>
using namespace std;

int main() {
    int age = 25;
    float height = 5.9;
    char grade = 'A';
    string name = "Alex";

    cout << "Name: " << name << endl;
    cout << "Age: " << age << endl;
    cout << "Height: " << height << endl;
    cout << "Grade: " << grade << endl;

    return 0;
}

Try It Now

📌 Common Data Types

Data Type Use
int Stores whole numbers (e.g. 42)
float Stores decimal numbers (e.g. 3.14)
char Stores single characters (e.g. ‘A’)
string Stores text (e.g. “Hello”)
bool Stores true or false

🧠 Remember

  • Variable names must begin with a letter or underscore
  • They cannot have spaces or special symbols (except _)
  • Use meaningful names like score or userAge