The NAMES that identify or represent the variables, constants, data types, functions and labels in C language.. They are mere(only) NAMES, that help in IDENTIFYING variables, data types, constants, functions and labels to differentiate them from each other.. A good identifier must be descriptive but short..
1. identifiers beginning with a letter 2. identifiers beginning with an underscore
Yes they is different, C language are case-sensitive.
An identifier is a name. All names must be declared with a type.
all keywords
'Keyword' is a synonym for 'reserved word', it is not specific to C language.
Some languages have specific terms, however keyword or reserved word is the general terminology we use when referring to a programming language's primary vocabulary. That is; words that cannot be used as identifiers. However, some languages also have contextual keywords. For instance, C++ has final and override contextual keywords. These can be used as both identifiers and keywords, depending on the context. The only reason for this is that people were using these words as identifiers before they were introduced to the language (in C++11) and making them actual keywords would have broken a lot of older code.
formatted
There is no meaning for the C in C-language. Previously , there was a language called BCPL (Basic combined programming language) ,Ken thompson improved this language and named as B language. After several modifications and inclusion of advanced features such as Pointers , Dennis Richie named it as C , (C comes after B in Alphabetical Order) So , name for that Language came in this way. Later Bjourne Strostrup included Object Oriented features to C , and Named 'C with Classes ' and later C++.
C, o, u, e
Some languages have specific terms, however keyword or reserved word is the general terminology we use when referring to a programming language's primary vocabulary. That is; words that cannot be used as identifiers. However, some languages also have contextual keywords. For instance, C++ has final and override contextual keywords. These can be used as both identifiers and keywords, depending on the context. The only reason for this is that people were using these words as identifiers before they were introduced to the language (in C++11) and making them actual keywords would have broken a lot of older code.
Let c = a+b
C, o, u, e