C++ Basic Input/Output

In C++, cout sends formatted output to standard output devices, such as the screen. We use the cout object along with the

Example 1: String Output

#include using namespace std; int main() < // prints the string enclosed in double quotes cout

Output

This is C++ Programming

How does this program work?

We first include the iostream header file that allows us to display output.
The cout object is defined inside the std namespace. To use the std namespace, we used the using namespace std; statement.
Every C++ program starts with the main() function. The code execution begins from the start of the main() function.
cout is an object that prints the string inside quotation marks " " . It is followed by the
return 0; is the "exit status" of the main() function. The program ends with this statement, however, this statement is not mandatory.

Note: If we don't include the using namespace std; statement, we need to use std::cout instead of cout .

This is the preferred method as using the std namespace can create potential problems.

However, we have used the std namespace in our tutorials in order to make the codes more readable.

#include int main() < // prints the string enclosed in double quotes std::cout

Example 2: Numbers and Characters Output

To print the numbers and character variables, we use the same cout object but without using quotation marks.

#include using namespace std; int main() < int num1 = 70; double num2 = 256.783; char ch = 'A'; cout

Output

70 256.783 character: A

Notes:

cout


C++ Input
In C++, cin takes formatted input from standard input devices such as the keyboard. We use the cin object along with the >> operator for taking input.
Example 3: Integer Input/Output
#include using namespace std; int main() < int num; cout > num; // Taking input cout
Output
Enter an integer: 70 The number is: 70
In the program, we used
cin >> num;
to take input from the user. The input is stored in the variable num . We use the >> operator with cin to take input.
Note: If we don't include the using namespace std; statement, we need to use std::cin instead of cin .
C++ Taking Multiple Inputs
#include using namespace std; int main() < char a; int num; cout > a >> num; cout
Output
Enter a character and an integer: F 23 Character: F Number: 23
Table of Contents

  C++ Output
  Example 1: String Output
  Example 2: Numbers and Characters Output
  C++ Input
  Example 3: Integer Input/Output
  C++ Multiple Input