Basics of C++ - Ebhor.com

Tokens in C++

In a C++ language, token is either a keyword, a symbol ,an identifier, a constant or a string literal.

A C++ program consists of various tokens for example, the following C++ program consists of four tokens

cout<< “Hello”;

1	cout<< “Hello”;

The individual tokens are −

cout
<<
"Hello"
;

cout

"Hello"

;

Comments are the text in C++ program language and they are ignored by the compiler during compilation and execution.

They start with /* and terminate with the characters */ as shown below −

/* first C ++ program */

Anything written within Comment will never execute. You can’t write comments within comments.

This is a multi line comment.

We can also use single line comment.

Single line comment start with // and continue until the end of the line.

In a C++ language, identifier is a name given to any variable, function, or any other user-defined item.

In C++ language identifier starts with a letter A to Z, a to z, digits (0 to 9) or an underscore ‘_’ followed by zero.

C++ language does not allow punctuation characters such as @, $, and % within identifiers.

Here are some examples of acceptable identifiers −

kumar       aditya    abc   move_name   a_123
name70           j      a23b9        myDemo

1 2	kumar aditya abc move_name a_123 name70 j a23b9 myDemo

In a C++ language keywords are the reserved\predefined words whose meaning already explained in a compiler.

These reserved words can’t be used as a variables or identifier names.

There are 60 key words currently defined for C++.