Solved

help (urgent)

Posted on 1997-04-30
8
208 Views
Last Modified: 2010-04-10
I have a little problem concerning arrays.

Say I have an array called Numbers and it has 10 elements :

array pointer       contents
    0                  3
    1                  8
    2                  12
    3                  66
    4                  7
    5                  128
    6                  1001
    7                  45
    8                  63
    9                  1137

To access for example the third elemnt in the array, I have to write, cout << Numbers[2] << endl ;
and that would print 12.
But if I had two variables, x = 1 and y = 2 then typing, cout << Numbers[x+y] does not print 12, instead it prints 3.

Does anyone know why that is, and how can I correct this so that it prints the contents instead.

Cheers.

My email address is :

a.Al-allak@uea.ac.uk
0
Comment
Question by:9628657
8 Comments
 

Expert Comment

by:SAS
ID: 1163124
Could use some source code. Is x and y an int? how are you defining x and y?
0
 

Author Comment

by:9628657
ID: 1163125
Yes, x and y are defined as integers.
0
 
LVL 2

Expert Comment

by:Philippe
ID: 1163126

The way you discribe it there should be no problem... Can you post more of your code?

 Philippe

0
 
LVL 4

Expert Comment

by:AVaulin
ID: 1163127
What compiler do you use?
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Expert Comment

by:michaelf
ID: 1163128
It is not possible to find error in your code until you post this code!
0
 
LVL 1

Accepted Solution

by:
jmmougeolle earned 10 total points
ID: 1163129
That's normal you got that result...

Your X+Y value give a result of 3 So Numbers[3] is exactely 3!
What you want to have as a X+Y result is 2!!! Not 3! SO Numbers[2] will give you 12, and that's what you are expecting!

In fact, the error come from the 0 based organisation of your coordinate!

Don't hesitate to ask for more info!


May the MFC be with you!
jmmougeolle@calva.net strikes back!
0
 

Expert Comment

by:Marauder010197
ID: 1163130
The problem you posted is NOT normal (as jmmougeolle said). In fact, x+y = 3, and therefore Numbers[x+y] should give 66, not 12 as you're expecting. But I'd recommend posting most of your program, so that I may be able to find the actual error.
0
 

Expert Comment

by:tooltown
ID: 1163131
jmmougeolle said:

>That's normal you got that result...

>Your X+Y value give a result of 3 So Numbers[3] is exactely 3!
>What you want to have as a X+Y result is 2!!! Not 3! SO >Numbers[2] will give you 12, and that's what you are expecting!

>In fact, the error come from the 0 based organisation of your >coordinate!

I do not believe this answer to be correct for the following reason: If you want x+y to give you the answer 2 so the number  12 will be displayed, why was 66 not displayed when x+y summed to 3? 66 is the value in element 3 of the array and that is what should have been displayed if jmmougeolle's theory is correct. Just a thought....no offense is intended.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now