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Input and Output in C++

📘 C++ 👁 27 views 📅 Dec 22, 2025
⏱ Estimated reading time: 2 min

Input and output operations allow interaction between the user and the program.

1. Input in C++

C++ uses the cin object to take input from the user.

Syntax

cin >> variable;

Example

int age;
cin >> age;

  • >> is called the extraction operator

  • Takes input from the keyboard

2. Output in C++

C++ uses the cout object to display output on the screen.

Syntax

cout << variable>

Example

cout << age>

  • << is called the insertion operator

  • Displays output on the screen

3. Header File Required

To use cin and cout, include:

#include 
using namespace std;

4. Displaying Text and Variables

cout << "Age: " << age>

  • Multiple values can be displayed using <<

5. Taking Multiple Inputs

int a, b;
cin >> a >> b;

6. New Line in Output

Using endl:

cout << "Hello" << endl>

Using \n:

cout << "Hello\n";

7. Complete Example Program

#include 
using namespace std;

int main() {
    int x, y;
    cin >> x >> y;
    cout << "Sum = " << x>return 0;
}

8. Input and Output with Strings

string name;
cin >> name;
cout << name>

Note: cin reads input only until a space.

Key Points

  • cin is used for input

  • cout is used for output

  • >> and << are stream operators

  • endl moves the cursor to a new line

Conclusion

Input and output operations are essential for making C++ programs interactive and user-friendly.

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