Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0 - C# Discussion Boards

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 21:45

I did mess up with the whole greater and less then thing... its suppossed to be

i<100 && i> 0

and your right, it is an endless loop of "it doesn't work"

...

and if I make those changes

public set(int[] intSet)
       {
     this.boolSet = new bool[intSet.Length];


           for (int i = 0; i < intSet.Length;i++)//change to while maybe
           {

               if (!(intSet[i] > 0 && intSet[i] < 100))
               {

                   boolSet[intSet[i]] = true;

               }
               else
               {
                   Console.WriteLine("This doesn't work");
                  boolSet[intSet[i]] = false;
               }
           }
       }

it goes through "this doesn't work" the whole time...

SeMartens9-Sep-09 21:48

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 21:48

Well then you should put away the ! in your if-statement...

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Sivyo9-Sep-09 21:57

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 21:57

it still goes through "This doesn't work " a whole lot but does insert the numbers into the array

Sivyo9-Sep-09 22:03

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:03

it still doesn't stop my program from crashing when the user inserts a number over those numbers

SeMartens9-Sep-09 22:08

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:08

Do you receive an exception? If yes, what message does the exception has?

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Sivyo9-Sep-09 22:10

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:10

I noticed when I debug that it doesn't get i... i is always equal to 0

OriginalGriff9-Sep-09 21:58

OriginalGriff

9-Sep-09 21:58

I'm betting it doesn't do it "the whole time" - just about 100 times!
I think if you put a similar Console.WriteLine into the "boolSet[intSet[i]] = true" part of the if statement, then it will not happen often. Why? Because your input data is nearly all negative or greater than 100.

Do you know how to use the debugger? If so then put a breakpoint on the "boolSet = new bool..." line, and single step you way round the loop a few times - see what you have in the data, and what your code it doing with it. It is well worth getting used to the debugger, it will save you a lot of time in the future!

P.S. you don't need the "this." part of "this.boolSet = new bool..." - it is implied and makes the code harder to read... It's not wrong to include it, but it isn't needed and you will find out later why you can do it.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

OriginalGriff9-Sep-09 22:02

OriginalGriff

9-Sep-09 22:02

Addendum: Now that you have changed to "boolSet[intSet[i]]" you need to swap the "new bool[inset.Length]" back to "new bool[101]" or you will have problems if the number of elements in your data is less than 101!

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

Sivyo9-Sep-09 22:11

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:11

I noticed when debugging that i is always equal to 0...

SeMartens9-Sep-09 22:12

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:12

Okay, could you post the code with all your changes again. I'm not sure what you changed and what not... Did you forgot the i++ in the for-loop?

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Sivyo9-Sep-09 22:14

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:14

public set(int[] intSet)
       {
           this.boolSet = new bool[101];


           for (int i = 0; i < intSet.Length;i++)

               if (intSet[i] > 0 && intSet[i] < 100)
               {

                   boolSet[intSet[i]] = true;

               }
               else
               {

                  boolSet[intSet[i]] = false;
               }
           }
       }

would it be easier to check the range when user inserts numbers?

int[] userIn = new int[3];

     bool flag = false;
     while (flag ==false)
     {
         Console.WriteLine("User, please enter 3 number 0 - 100");
         for (int i = 0; i < userIn.Length; i++)
         {
             if (Int32.TryParse(Console.ReadLine(), out userIn[i]))
                 flag = true;

         }
     }

That is in main

SeMartens9-Sep-09 22:19

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:19

Is the app crashing in the main-method or within the set-method? The set-method seems to be okay...

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Sivyo9-Sep-09 22:21

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:21

its crashing as soon as after the 3 numbers are entered. Maybe it would be better if one of the numbers is checked first then inserted into the array...

DavodM9-Sep-09 22:33

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:33

Your crash is likely coming from here:

else
{
                 
    boolSet[intSet[i]] = false; 
}

If intSet[i] is greater than 100 or less then 0(lets say its 103) we go into the else block. Your boolSet array only has 101 items in it so trying to access boolSet[103] will raise and arrayOutOfBoundsException (or something similar) is that the message you see?

Also can you state the programs goals more clearly? What information should boolSet hold?

Sivyo9-Sep-09 22:39

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:39

boolSet should hold weather or no each array has been chosen.

Example in an array of 5 and the numbers 1 2 3 5 were chosen then...

0 = False, 1 = False, 2 = true, 3 = True, 4 = False, 5 = True

so the program will show on the Console Write line 1 2 3 5

SO I have random numbers from 0 to 100 chosen in order to create 2 separate sets.

Then the user must insert 3 numbers to create a userSet. This is where I am having problems. If the user stays in range ect. then it works fine. But when he/she doesn't... well... I get out of bounds error. I know there must be an easier way of doing it... but I really don't have any experience

DavodM9-Sep-09 22:53

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 22:53

I see. It should be a fairly easy fix then. (although you have some other problems in your user input code)

The easiest way to fix the crash is to remove the else block completely. Think about it, if intSet[i] is not between 0 and 100 there is not an entry in the boolSet array to hold the information, and in fact you don't need one if you only care about the numbers 0 to 100 anyway!

The best way with your current code would be to have all the elements in boolSet set to false to start with then let the code you already have set to true the ones the user entered.

For the problems with your input code, try entering 1, 2, d. Cool | :cool:

Also if you have the requirements from the assignment posting them here (or the relevant parts) would give us a clear idea of what you have to achieve. (note I have no intention of doing your homework for you but im quite happy to you help you with problems as you have been doing the work yourself so far! Laugh | :laugh:

)

Sivyo9-Sep-09 23:05

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:05

yea I figured that,

there are two parts, the first part...

Write a class that will be used for creating sets of whole numbers in the range of 0…100. Implement the sets with a Boolean array. Define in the class the following operations:
1. A constructor without parameters, which initialize the set as an empty set.
2. A constructor that gets an array of wholes and creates a set that contains those array members.

9. Override the methods ToString and Equals that inherit from Object in the following way:
10. ToString – will return a string representation of the set.

Part two is where the user comes in

Write a program that checks the sets class in the following way:
• Create 2 sets by drawing 10 random numbers in the range of 0…100 for each set, and display the sets contents.
• Perform intersection and union of the two sets and display the received sets.
• Get from the user 3 numbers and create a third set. Check whether this set is a sub-set of one of the sets and display the result.

I am also having problems that after I create union and intersection, there is only one set and not two and the originals die...

I haven't played around with that yet so not going to ask for help with it yet.

DavodM9-Sep-09 23:18

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:18

Looks like an interesting assignment. Are you still having problems with the previous bits?

Sivyo9-Sep-09 23:23

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:23

nah, don't have a problem with the strange 0, for some reason its not there anymore.

Sivyo9-Sep-09 23:12

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:12

found another issue... I insert 3 6 fg and get an output of 4 7....

DavodM9-Sep-09 23:23

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:23

Im guessing you had been round the for loop a couple of times before you put the right input in?

I would suggest scrapping the user input code and starting again, sometimes its easier than fixing something.

You might want to break it down into smaller chunks, i.e get the input and store as a string, then try parsing it to an int and then if that works add it to the array, if not ask the user again. Repeat the above 3 times and bingo!

The code will be more verbose but it will be easier to debug and understand and once you have it working you can always go back over it and refactor it.

Terse code can look better but it can also be hard to understand and maintain.

Sivyo9-Sep-09 23:31

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:31

I will do just that...

Going to go to the school and see if I can work on it there and get some more help.

Thanks everyone for trying to help me out, if anyone else can help out still that would be great, will pop in here often, C# is killing me

DavodM9-Sep-09 23:35

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:35

You'll get your head round it eventually! Its just a matter of getting used to the way of thinking. I'm assuming this is your first programming language?

Sivyo9-Sep-09 23:39

Re: User Input Into Array, Need To Check Array Member If It Is Greater Then 100 Or Less Then 0

9-Sep-09 23:39

we learned C and C++ but I was never very good at it, and every time we learn a new language the problems become more difficult. Also, we only study each language up to 2 or 3 months, its a 2 year college.

Sivyo10-Sep-09 12:06