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Variables, Data Types & I/O - Concepts

Explore the key concepts of variables, data types & i/o with practical examples and exercises.

45 min•By Priygop Team•Last updated: Feb 2026

Introduction to Variables, Data Types & I/O

In this section, we cover the fundamental aspects of variables, data types & i/o. You'll learn core concepts, see real-world examples, and understand how to apply them in your projects.

Key Concepts

Understanding the core principles of variables, data types & i/o
Practical applications and real-world use cases
Step-by-step implementation guides
Common patterns and best practices
Tips for debugging and troubleshooting
Performance optimization techniques

Variables, Data Types & I/O - Code Example

Example

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

int main() {
    int age = 25;
    double salary = 55000.50;
    string name = "Alice";
    bool active = true;
    auto count = 42; // Type inference

    cout << "Name: " << name << endl;
    cout << "Age: " << age << endl;
    cout << "Salary: " << salary << endl;

    cout << "Enter your name: ";
    getline(cin, name);
    cout << "Hello, " << name << "!" << endl;
    return 0;
}

Try It Yourself: Variables, Data Types & I/O

Try It Yourself: Variables, Data Types & I/OC++

C++ Editor

✓ ValidTab = 2 spaces

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

int main() {
    string name;
    int age;
    
    cout << "Enter name: ";
    getline(cin, name);
    cout << "Enter age: ";
    cin >> age;
    
    cout << "Hello " << name << "!" << endl;
    cout << "In 10 years: " << age + 10 << endl;
    
    // String operations
    cout << "Name length: " << name.length() << endl;
    cout << "Upper first: " << (char)toupper(name[0]) << name.substr(1) << endl;
    return 0;
}

Output

Click ▶ Run to see the result

Edit the code on the left, then click Run

C++|21 lines|482 chars|✓ Valid syntax

UTF-8

Quick Quiz: Variables, Data Types & I/O

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