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 five tokens −
printf("Hello, World! \n");
The individual tokens are −
Comments are the text in C program and they are ignored by the compiler during compilation and execution.
They start with /* and terminate with the characters */ as shown below −
value of i & j = 10 20
Anything written within Comment will never execute. You can’t write comments within comments.
In a C language, identifier is a name given to any variable, function, or any other user-defined item.
C language identifier starts with a letter A to Z, a to z, digits (0 to 9) or an underscore ‘_’ followed by zero.
C 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 words whose meaning already explained in a compiler.
These reserved words can’t be used as a variables or identifier names. There are 32 Keywords in C