Solved

help (urgent)

Posted on 1997-04-30
8
215 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
Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

 
LVL 4

Expert Comment

by:AVaulin
ID: 1163127
What compiler do you use?
0
 

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

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

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

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…
Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

777 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