C++ cin and cout

Introduction

cin and cout are used to read and write data from and to the console.

cin is used to read data from the console. (read from keyboard)
cout is used to write data to the console. (output to screen)

Example:
cin >> x;


Reads a value from the console and stores it in the variable x.

cout << "Hello World";


Writes "Hello World" to the console.

#include <iostream>
using namespace std;

int main() {
	cout << "Hello World!";
	return 0;
}
	

#include <iostream>
using namespace std;

int main() {
	int x;
	cout << "Enter a number: ";
	cin >> x;
	cout << "Square of " << x << " is " << x*x;
	return 0;
}
	

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

int main() {
	string name;
	cout << "Enter your name: ";
	cin >> name;
	cout << "Welcome " << name;
	return 0;
}