C++ Data Types

In C++, a data type specifies the type of data that a variable can store. Different data types require different amounts of memory and represent different kinds of values.

Basic Data Types

The following table shows some of the most commonly used data types in C++.

Data Type	Description	Example
int	Used to store integer numbers	int age = 25;
float	Used to store decimal numbers	float price = 10.5;
double	Used to store large decimal numbers with more precision	double pi = 3.14159;
char	Used to store a single character	char grade = ‘A’;
bool	Used to store true or false values	bool isActive = true;
string	Used to store text	string name = “John”;

Example Program

#include <iostream>
#include <string>
using namespace std;

int main() {

    int age = 25;
    float price = 19.99;
    char grade = 'A';
    bool isStudent = true;
    string name = "Alice";

    cout << "Name: " << name << endl;
    cout << "Age: " << age << endl;
    cout << "Price: " << price << endl;
    cout << "Grade: " << grade << endl;
    cout << "Student: " << isStudent << endl;

    return 0;
}

Output

Name: Alice
Age: 25
Price: 19.99
Grade: A
Student: 1

Important Notes

Each variable must have a data type.
Data types define the size and type of values that can be stored.
Choosing the correct data type helps improve program efficiency.

Next Topic

Next, learn about C++ Constants.