Hi!
I have aa array with pointers to the class(object) Person that I
created
( Person *ptr[10]; ). From class person there are two derived classes,
student and employee. I can add and remove objects of these types in
my array. Now I want to be able to search for a specific object of my
choice based on the persons name. How do I do that?? I need help.
So far this is what I've come up with...
//The class Personlist contains the Person *ptr[10], and functions
//to add/remove objects.
bool Personlist::find(char* name, int & position)
{
bool result = true;
int i = 0;
position = -1;
while(i<number_of_elements)//number_of elements is number of
//objects in array
{
//The Person class have a variable called m_name.
//How can I reach it from here and compare it to what
//name is sent into this function? For now I just want
to
//return true or false (and reference to position).
i++;
}
if(position == -1)
result = false;
return result;
}
Thanks,
Tommy 5 3269
<snip> //The class Personlist contains the Person *ptr[10], and functions //to add/remove objects. bool Personlist::find(char* name, int & position)
You should use 'const char* name' since you're not goint to modify that
string! Even better would be to use std::string instead of char-arrays... { bool result = true; int i = 0; position = -1;
while(i<number_of_elements)//number_of elements is number of //objects in array
Hint: You could already leave the loop when you have found the name in
the list and, thus, position is no more -1. { //The Person class have a variable called m_name. //How can I reach it from here and compare it to what //name is sent into this function? For now I just want to //return true or false (and reference to position).
The function to compare to char-arrays is strcmp which returns 0 if both
are equal. If you'd use std::string you can simply use the operator==. i++; }
if(position == -1) result = false;
return result;
}
You should also consider using std::map instead of an array to store the
Person-pointers since it is much more flexible and more comfortable to
use...
"Tommy Lang" <mu*****@yahoo.se> wrote in message
news:78**************************@posting.google.c om... Hi!
I have aa array with pointers to the class(object) Person that I created ( Person *ptr[10]; ). From class person there are two derived classes, student and employee. I can add and remove objects of these types in my array. Now I want to be able to search for a specific object of my choice based on the persons name. How do I do that?? I need help.
So far this is what I've come up with...
//The class Personlist contains the Person *ptr[10], and functions //to add/remove objects. bool Personlist::find(char* name, int & position) { bool result = true; int i = 0; position = -1;
while(i<number_of_elements)//number_of elements is number of //objects in array { //The Person class have a variable called m_name. //How can I reach it from here and compare it to what //name is sent into this function? For now I just want to
Ibelieve Personlist ia nother class different from person.
Add a public member function to your Person class.
It should return you the m_name varaible.
Then use strcmp to compare the values in this function.
Even better and safe is to use std::string.
-Sharad
"Tommy Lang" <mu*****@yahoo.se> wrote in message
news:78**************************@posting.google.c om... Hi!
I have aa array with pointers to the class(object) Person that I created ( Person *ptr[10]; ). From class person there are two derived classes, student and employee. I can add and remove objects of these types in my array. Now I want to be able to search for a specific object of my choice based on the persons name. How do I do that?? I need help.
So far this is what I've come up with...
//The class Personlist contains the Person *ptr[10], and functions //to add/remove objects. bool Personlist::find(char* name, int & position)
That should be
bool Personlist::find(const char* name, int & position) const
const correctness is important in C++.
{ bool result = true; int i = 0; position = -1;
while(i<number_of_elements)//number_of elements is number of //objects in array { //The Person class have a variable called m_name. //How can I reach it from here and compare it to what //name is sent into this function? For now I just want to //return true or false (and reference to position).
Are you using a character array or a string to store the name? You should be
using a string but many newbies don't because they aren't taught right. I'm
going to assume a character array.
You should have something like this in your Person class
class Person
{
public:
...
const char* get_name() const { return m_name; }
...
private:
...
char m_name[99]; // name is a character array
...
};
Then in your loop you use strcmp to compare the passed in name with the
person name.
if (strcmp(ptr[i]->get_name, name) == 0)
// names are the same
else
// names are different
john
John Harrison wrote:
class Person { public: ... const char* get_name() const { return m_name; } ... private: ... char m_name[99]; // name is a character array ... };
Then in your loop you use strcmp to compare the passed in name with the person name.
if (strcmp(ptr[i]->get_name, name) == 0)
Typo:
if (strcmp(ptr[i]->get_name(), name) == 0)
--
Karl Heinz Buchegger kb******@gascad.at
> if (strcmp(ptr[i]->get_name, name) == 0)
Sorry, should be
if (strcmp(ptr[i]->get_name(), name) == 0)
john This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: Federico G. Babelis |
last post by:
Hi All:
I have this line of code, but the syntax check in VB.NET 2003 and also in
VB.NET 2005 Beta 2 shows as unknown:
Dim local4 As Byte
Fixed(local4 = AddressOf dest(offset))
...
|
by: justanotherguy63 |
last post by:
Hi,
I am designing an application where to preserve the hierachy and for
code substitability, I need to pass an array of derived class object in
place of an array of base class object. Since I...
|
by: ritchie |
last post by:
Hi,
I am writing to ask if anyone can see why my array is not being sorted
correctly?
It's an array of 4 elements(ints 1,2,3,4) but after calling the
selection sort
it comes back sorted as...
|
by: Gerald |
last post by:
I have a problem with an array of pointers.
In a program I'm writing, I have to read a file, containing thousands
of short lines. The content of another file will be compared against
each line...
|
by: arkobose |
last post by:
my earlier post titled:
"How to input strings of any lengths into arrays of type: char
*array ?"
seems to have created a confusion. therefore i paraphrase my problem
below.
consider the...
|
by: Alexei A. Frounze |
last post by:
Hi all,
I have a question regarding the gcc behavior (gcc version 3.3.4).
On the following test program it emits a warning:
#include <stdio.h>
int aInt2 = {0,1,2,4,9,16};
int aInt3 =...
|
by: intrepid_dw |
last post by:
Hello, all.
I've created a C# dll that contains, among other things, two functions
dealing with byte arrays. The first is a function that returns a byte
array, and the other is intended to...
|
by: Leszek |
last post by:
Hi.
Is it possible in javascript to operate on an array without knowing how mamy
elements it has?
What i want to do is sending an array to a script, and this script should
add all values from...
|
by: sandy |
last post by:
I need (okay, I want) to make a dynamic array of my class 'Directory',
within my class Directory (Can you already smell disaster?)
Each Directory can have subdirectories so I thought to put these...
|
by: assgar |
last post by:
Hi
Seasons Greetings
Its back, I am being haunted.
I thought I had resolved this problem but I am intermittently
the receving the warnings below.
This code consist of a 1) HTML form, 2)...
|
by: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
|
by: Sonnysonu |
last post by:
This is the data of csv file
1 2 3
1 2 3
1 2 3
1 2 3
2 3
2 3
3
the lengths should be different i have to store the data by column-wise with in the specific length.
suppose the i have to...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and...
| |