Answer Posted / reddy

• C does not have any classes or objects. It is
procedure and function driven. There is no concept of
access through objects and structures are the only place
where there is a access through a compacted variable. c++
is object oriented.
• C structures have a different behaviour compared to
c++ structures. Structures in c do not accept functions as
their parts.
• C input/output is based on library and the
processes are carried out by including functions. C++ i/o
is made through console commands cin and cout.
• C functions do not support overloading. Operator
overloading is a process in which the same function has two
or more different behaviours based on the data input by the
user.
• C does not support new or delete commands. The
memory operations to free or allocate memory in c are
carried out by malloc() and free().
• Undeclared functions in c++ are not allowed. The
function has to have a prototype defined before the main()
before use in c++ although in c the functions can be
declared at the point of use.
• After declaring structures and enumerators in c we
cannot declare the variable for the structure right after
the end of the structure as in c++.
• For an int main() in c++ we may not write a return
statement but the return is mandatory in c if we are using
int main().
• In C++ identifiers are not allowed to contain two
or more consecutive underscores in any position. C
identifiers cannot start with two or more consecutive
underscores, but may contain them in other positions.
• C has a top down approach whereas c++ has a bottom
up approach.
• In c a character constant is automatically elevated
to an integer whereas in c++ this is not the case.
• In c declaring the global variable several times is
allowed but this is not allowed in c++.

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