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