Cout in C++

Cout in C++:

In previous tutorial, we learnt how to store data. Now we will learn in this C++ tutorial that how to print that desired result on the console.

In C++, output on the standard output device is accomplished through the use of "cout" and the operator “ << ”.

Note: 

The standard output device is usually the screen.

Syntax:

cout << expression or identifier ;

This is called an output statement. In C++, "<<" is called the stream insertion operator.

Example:

 Here are some simple c programs with output to show the use of this command.

1.  char ch = A.

     cout << ch;

Output:

A                             //This A was stored in char variable ch

2.  cout << ‘A’;

Output:

A                             //This A was hard coded

For char ch variable, you didn’t needed double quotes but for hard coded ‘A’ you needed double quotes.

Statement                                                  Output

cout << 29 / 4 << endl;                                   7

cout <<“Hello World”<< endl;                    Hello World

cout <<20<< endl;                                         20

cout <<3.2<< endl;                                       3.2

cout << ”29 / 4“ << endl;                             29 / 4

cout <<20 + 100<< endl;                              120        

cout <<‘A’<< endl;                                          A

cout <<“4 + 16 =”<<4 + 20 <<endl;           4 + 16 = 20

cout <<2 + 3 * 4<< endl;                               14

cout <<“Hello \nWorld”<< endl;                Hello

                                                                                World

Look at the statement cout << “Hello \nWorld” << endl;

This statement contains \n. It is a newline character. It causes the insertion point to move to the beginning of the next line before printing there. That’s why it prints Hello one line and World on the next line.

Note:In C++, \ is called the escape character and \n is called newline escape sequence.

If we don’t assign any value to a variable and try to cout it on the screen then it will print a junk value.

Example:

int num;

cout << num <<endl;

The output will be some junk value.

Final Words:

In this c tutorial for beginners we have discussed how to print something on console with the help of cout in c ++.We have also showed some c programs with output which clarify the use of cout command in C++.