Answer Posted / kunal kumar

* 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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Question: Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and Monthly. An appointment has a description (for example, “see the dentist”) and a date and time. Write a virtual function occurs_on(int year, int month, int day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of Appointment* with a mixture of appointments. Have the user enter a date and print out all appointments that happen on that date.

895

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class CTest { public: void someMethod() { int nCount = 0; cout << "This is some method --> " << nCount; } }; int main() { CTest *pctest; pctest->someMethod(); return 0; } It will executes the someMethod() and displays the value too. how is it possible with our creating memory for the class . i think iam not creating object for the class. Thanks in Advance... Prakash

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#include #include #include #include void insert(char *items, int count); int main(void) { char s[255]; printf("Enter a string:"); gets(s); insert(s, strlen(s)); printf("The sorted string is: %s.\n", s); getch(); return 0; } void insert(char *items, int count) { register int a, b; char t; for(a=1; a < count; ++a) { t = items[a]; for(b=a-1; (b >= 0) && (t < items[b]); b--) items[b+1] = items[b]; items[b+1] = t; } } design an algorithm for Insertion Sort

2348

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