Input and Output in C++

📘 C++ 👁 52 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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Input and Output in C++

⏱ Estimated reading time: 2 min

1. Input in C++

Syntax

Example

2. Output in C++

Syntax

Example

3. Header File Required

4. Displaying Text and Variables

5. Taking Multiple Inputs

6. New Line in Output

7. Complete Example Program

8. Input and Output with Strings

Key Points

Conclusion

Variables and Data Types in C++

Operators in C++

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