The C programming language uses libraries as its primary method of extension. In C , a library is a set of functions contained within a single "archive " file . Each library typically has a header life , which contains the prototypes of the functions contained within the library that may be used by a program , and declarations of special data types and macro symbols used with these functions . The most common C library is the C standard library , which is specified by the ISO and ANSI C standards and comes functions with every C implementation. Another common set of C library functions are those used by applications specifically targeted for Unix like systems , especially functions which provide an interface to the kernel. Libraries are often written in C because C compilers generate efficient object code ; programmers then create interfaces to the library so that the routines can be used from higher-level languages like Java , Perl , and Python.
An operator is a symbol that operates on a certain data types and produce the output as the result of the operation. Category of Operators • Unary Operator An unary operator is an operator which operates on one operand that is it operates on itself. Operand1 operator Here Operand1 may be a variable , a constant or an expression etc. For example: -b , ~a , x+1 etc. • Binary Operator A binary operator is an operator which operates on two operands. Operand1 operator Operand2 Here Operand1 and Operand2 maybe a variable, a constant or an expression etc. and Operator must be either arithmetic type or relational type or logical type etc. For example: a+b , a && b , etc. • Ternary Operator A ternary operator is an operator which operates on 3 operands. Operand1 o perator Operand2 operator Operand3 Here Operand1 , Operand 2 , Operand3 may be a variable , a constant or an expression etc. and Operator must be either arithm