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
The individual tokens are −
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
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++.