help to solve this

[sudeep]

C++ Programming Language Assignment 1

Associative Array Class
Problem Statement
Associative arrays are a useful feature found in many languages
particularly in those that are interpretive and support dynamic
variables, such as awk, perl, APL, etc.
An associative array is very much like the much familiar array, with
the only difference that the index specified, can be of any type. (In
arrays, array index HAS TO BE integer). An associative array provides
all the standard array operations of element access and assignment.

In this assignment, you are to make available an associative
array-mechanism using C++. This is done be defining a class, called
AssocArray.
Sample Program
Use of the class is illustrated by the following code. It uses an
associative array to count the frequency of words in the input. After
reading the input, the top ten most frequent words are displayed.

#include <iostream.h>
#include "Assoc.h"

const int TOPNUM = 10;

int main()
{
AssocArray wordCount;
int i, j, added, c[TOPNUM];
char word[128], *w[TOPNUM];

while ( cin >> word ) wordCount[word]++;

for ( i = 0; i < TOPNUM; i++ ) {
c[i] = 0; w[i] = 0;
}

for ( wordCount.start (); !wordCount.last (); wordCount.next( ) ) {
added = 0;
for ( i = 0; (i < TOPNUM) && !added; i++ ) {
if ( wordCount.value () > c[i] ) {
for ( j = TOPNUM-1; j > i; j-- ) {
c[j] = c[j-1];
w[j] = w[j-1];
}

w[i] = wordCount.key() ;
c[i] = wordCount.value ();
added = 1;
}
}
}

for ( i = 0; i < TOPNUM; i++ )
if ( w[i] )
cout << w[i] << " " << c[i] << endl;

return 0;
}
Specifications
Do not make assumptions about the maximum number of keys for choosing
a representation for the AssocArray. The suggested representation is
an ordered linked list of < key, value > pairs, where the key is a
string (char*) and value is an int
For the class, you are expected to code
default constructor
a constructor with an integer initializer - this should be the initial
value of any key that has been added (default value).
copy constructor
destructor - to ensure against memory leaks
assignment operator
Other methods, like start(), next(), last(), value(), as shown in the
sample have to be implemented.
Operators to be overloaded
[] - for array indexing
+ - for merging two associative arrays. Values added for the same key
value)
- - (a - b) contains those elements (key values) of 'a' that are not
there in 'b'
<< - to output the associative array
For comparisons of the keys of the associative array, you can make use
of the strcmp() function.
// append to file

[Bob Hairgrove]

On 17 Oct 2004 03:16:29 -0700, su************@ yahoo.co.in (sudeep)
wrote:

[snipped homework assignment]

You didn't tell us where you are stuck with the problem.

--
Bob Hairgrove
No**********@Ho me.com

[Alf P. Steinbach]

* sudeep:

C++ Programming Language Assignment 1
Write some code and post it along with specific questions.

Otherwise HOMEWORK is off-topic.

However, do give your C-oriented lecturer the following comments,
including this comment: C++ is not C, and a good book to learn
C++ from is "Accelerate d C++".

Sample Program
Use of the class is illustrated by the following code. It uses an
associative array to count the frequency of words in the input. After
reading the input, the top ten most frequent words are displayed.

#include <iostream.h>
The <iostream.h> header file is not a standard C++ header.

Corresponding facilities are provided by the <iostream> standard header.

#include "Assoc.h"

const int TOPNUM = 10;
All uppercase should only be used for macros.

int main()
{
AssocArray wordCount;
int i, j, added, c[TOPNUM];
Style: don't declare multiple variables this way.

Style: don't declare variables outside the block where they're used.

It's not a good idea to use global variables.

If your lecturer maintains there are no global variables he/she
should perhaps consider a new profession.

Style: use appropriate data types ('added' should be a 'bool').

char word[128], *w[TOPNUM];
It's not a good idea to teach use of pointers in a programming
assignment #1.

while ( cin >> word ) wordCount[word]++;
Possible buffer overflow (I don't know and don't care to check).
Use std::string instead of array of char.

for ( i = 0; i < TOPNUM; i++ ) {
Style: use '++i', not 'i++'.

c[i] = 0; w[i] = 0;
Bug: use of uninitialized variable 'w'.

Style: 'c' should have been initialized as follows:

int c[TOPNUM] = {0};

not via a loop.
}

And so on...

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

[Jacek Dziedzic]

sudeep wrote:

C++ Programming Language Assignment 1

http://www.parashift.com/c++-faq-lite/how-to-post.html

see 5.2

HTH,
- J.