Input and Output in C++

One of the important aspects of programming is the ability to interact with the user through input and output operations. In C++, this is accomplished using the input/output (I/O) library.

Output with cout

To display output in C++, you can use the cout object, which is part of the iostream library. Here's an example of how to use cout to print "Hello, World!" to the console:

1#include <iostream>
2using namespace std;
3
4int main() {
5  cout << "Hello, World!" << endl;
6  return 0;
7}

The << operator is used to insert values into the cout object, and the endl manipulator is used to insert a newline character.

Input with cin

To get input from the user in C++, you can use the cin object, also part of the iostream library. Here's an example of how to use cin to get the user's age and display it:

1#include <iostream>
2using namespace std;
3
4int main() {
5  int age;
6  cout << "Enter your age: ";
7  cin >> age;
8  cout << "Your age is " << age << endl;
9  return 0;
10}

In the above code, the >> operator is used to extract values from the cin object and store them in the age variable.

This allows you to write interactive programs where the user can provide input, which the program can then process and respond to.

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#include <iostream>

using namespace std;

​

int main() {

  // Simple output

  cout << "Hello, World!" << endl;

​

  // Input from user

  int age;

  cout << "Enter your age: ";

  cin >> age;

  cout << "Your age is " << age << endl;

​

  return 0;

}