Keywords in c. Keywords are those words whose meaning is already defined by compiler. Prev tutorial next tutorial. Keywords c programs are constructed from a set of reserved words which provide control and from libraries which perform special functions.
This section also describes extensions to standard keywords not only new ones. C language supports more than 64 keywords. Most of these keywords have already been discussed in the various sub sections of the c language like data types storage classes control statements functions etc.
Since automatic variables are local to a function they are also called local variables. Variables and keywords in c. Keywords are words that have special meaning to the c compiler.
C contains reserved words that have special meaning for the compiler. C keywords are also called as reserved words. See a description of translation phases in the preprocessor reference.
If square brackets are used in syntax descriptions they mean optional arguments as usual in syntax describing languages not square brackets as literals. For example at if is a valid identifier but if is not because if is a keyword. Keyword is a predefined or reserved word in c library with a fixed meaning and used to perform an internal operation.
In addition to keywords there are identifiers with special meaning which may be used as names of objects or functions but have special meaning in certain contexts. These reserved words are called keywords. Cannot be used as variable name.
They are recreated each time a function is executed. They cannot be used as identifiers in your program unless they include at as a prefix. To learn more visit c storage class.
Keywords in c programming language. Every keyword exists in lower case latter like auto break case const continue int etc. The first table in this topic lists keywords that are reserved identifiers in.
The basic instructions are built up using a reserved set of words such as main for if while default double extern for and int etc c demands that they are used only for giving commands or making statements. This statement suggests that var1 is a variable of storage class auto and type int. There are 32 keywords in c.
Keywords cannot be used as a name identifier of a variable class interface etc. In translation phases 7 and 8 an identifier cannot have the same spelling and case as a c keyword. Let us discuss some of the other keywords which allow us to use the basic functionality of c.