DIFFERENCE BETWEEN C,C++ AND JAVA

DIFFERENCES BETWEEN C,C++ AND JAVA IN A NUTSHELL

S.NO	C	C++	JAVA
1.	Structured programming language	Object-oriented programming language	Object-oriented programming language
2.	Compiled	Compiled	Compiled and interpreted
3.	32 keywords Eg:- case, char	60 keywords Eg:- class, protected	50 keywords Eg:- interface, extends
4.	Rules for naming identifier 1.      Should begin with alphabet 2.      Can have numbers,underscore 3.      Keywords cannot used as identifiers	Rules for naming identifier 1.      Should begin with alphabet 2.      Can have numbers,underscore 3.      Keywords cannot used as identifiers	Rules for naming identifier 1.      Can  begin with alphabet, underscore or dollar symbol. But cannot begin with a  number 2.      Keywords cannot used as identifiers
5.	Comments:- /*….*/ (multi line comment),   //(single line comment)	Comments:- /*….*/ (multi line comment),   //(single line comment)	Comments:- /*….*/ (multi line comment),   //(single line comment), /** …. */(documentation comment)
6.	Data types :- int,char,float,double,void	Data types :- int,char,float,double,void	Data types:- byte,short,int,long, float,double, char,boolean
7.	Bitwise shift operators are : >>(right shift),<<(left shift)	Bitwise shift operators are : >>(right shift),<<(left shift)	Bitwise shift operators are : >>(right shift),<<(left shift),>>>(triple right shift operator)
8.	Char is 8 bits wide	Char is 8 bits wide	Java uses Unicode to represent characters. It is 16 bits wide.
9.	Preprocessor directives allowed Eg:- #include,#define	Preprocessor directives allowed Eg:- #include,#define	No preprocessor directives
10.	Variables need not be initialized before using it	Variables need not be initialized before using it	Variables must be initialized before using it
11.	Array should be declared mentioning its size Eg:- int num[10];	Array should be declared mentioning its size Eg:- int num[10];	Arrays are declared without mentioning its size. int num[];  num=new int[10] (or) int num[]=new int[10];
12.	Explicit string data type not available	Explicit string data type not available	String data type available in java. It is a class
13.	Supports pointers	Supports pointers	Does not support pointers
14.	Structures and unions available	Structures and unions available	Structures and unions not available
15.	-	Supports operator overloading	Does not support operator overloading
16.	-	Programs can be written in c++ without using a class	All the code in java program needs to be written in one or more classes
17.	Global variables and functions are allowed	Global variables and functions are allowed	No global variables or functions
18.	-	Allows default arguments in functions	Not allowed in java
19.	-	Supports multiple inheritance	Multiple inheritance not supported
20.	-	Supports constructors and destructors	Supports constructors, no destructors
21.	Supports typedef	Supports typedef	Does not support typedef
22.	Unsigned integers can be declared	Unsigned integers can be declared	No unsigned integers
23.	Allows goto	Allows goto	Does not allow goto
24.	-	delete operator available	No delete operator
25.	-	Objects may be passed by value or by reference	Objects are passed by reference only in Java