c++ provides classes...and classes do what we want but why
then strcut are used...if we say data hiding... it is also
provided by c++ in structs then why to prefer clasess
They started with the brief introduction followed by few
basic C++ questions on polumorphism, inheritance and then
virtual functions.
What is polymorphims?
How you will access polymorphic functions in C?
How virtual function mechanism works?
117
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
155
Question In a class, there is a reference or pointer of an
object of
another class embedded, and the memory is either allocated
or assigned to the new object created for this class. In
the constructor, parameters are passed to initialize the
data members and the embedded object reference to get
inialized. What measures or design change should be advised
for proper destruction and avioding memory leaks, getting
pointers dangling for the embedded object memory
allocation? Please suggest.
Question Submitted By :: Sunil Kumar
I also faced this Question!! Rank Answer Posted By
Re: In a class, there is a reference or pointer of an
object of another class embedded, and the memory is either
allocated or assigned to the new object created for this
class. In the constructor, parameters are passed to
initialize the data members and the embedded object
reference to get inialized. What measures or design change
should be advised for proper destruction and avioding
memory leaks, getting pointers dangling for the embedded
object memory allocation? Please suggest.
Answer
# 1 use copy constructors
0 Shanthila
There is something to be taken care in destructor, in copy
constructor, suppose the memory is assigned to the embedded
member object pointer with the parameter passed value, but
if some other objects of different class also are pointing
to this memory, then if some one deletes the object then
this class member pointer object will become dangling, or
if the object is not deleted properly then there will be
memory leak. Please suggest the design change required to
handle or avoid this situation
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
void select(char *items, int count);
int main(void)
{
char s[255];
printf("Enter a string:");
gets(s);
select(s, strlen(s));
printf("The sorted string is: %s.\n", s);
getch();
return 0;
}
void select(char *items, int count)
{
register int a, b, c;
int exchange;
char t;
for(a = 0; a < count-1; ++a)
{
exchange = 0;
c = a;
t = items[ a ];
for(b = a + 1; b < count; ++b)
{
if(items[ b ] < t)
{
c = b;
t = items[ b ];
exchange = 1;
}
}
if(exchange)
{
items[ c ] = items[ a ];
items[ a ] = t;
}
}
}
design an algorithm for Selection Sort
24
What is byval and byref? What are differences between them?
119
write a program using c++ to implement single contiguous
memory mangement techniques.display the content of the main
memory after yhe allocation of jobs and percentage of the
wastage of the main memory
703
This program numbers the lines found in a text file. Write a
program that reads text from a file and outputs each line
preceded by a line number. Print the line number
right-adjusted in a field of 3 spaces. Follow the line
number with a colon, then one space, then the text of the
line. You should get a character at a time and write code to
ignore leading blanks on each line. You may assume that the
lines are short enough to fit within a line on the screen.
Otherwise, allow default printer or screen output behavior
if the line is too long (i.e., wrap or truncate). A somewhat
harder version determines the number of spaces needed in the
field for the line numbers by counting lines before
processing the lines of the file. This version of the
program should insert a new line after the last complete
word that will fit within a 72-character line.
171
How to Increment the value of the empid E001 for each and
every employee by using the programe?
They started with the brief introduction followed by few
basic C++ questions on polumorphism, inheritance and then
virtual functions.
What is polymorphims?
How you will access polymorphic functions in C?
How virtual function mechanism works?
107
What is Difeerence between List obj=new ArrayList(); and
ArrayList obj=new ArrayList()?
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