arrays

Hey, I am kinda having problems with the following...

Quote:

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The first array will have between 4 to 8 members of integer
data type and will be the IQs (Intelligent Quotient - usually
values between 80 and 150) for those people.

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I can't find a shorter way to do this. I mean usually you do it like int ages[5] = {49,48,26,19,16}; etc. but there has to be something for a wide range of numbers like here. And I have no idea how to include the 4 to 8 members in this :confused:

Maybe this format?

Code:

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ages[0] = 49;
     


        ages[1] = 48;
     


        ages[2] = 26;
     


        ages[3] = 19;
     


        ages[4] = 16;

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But then I don't quite know how to assign the IQ value to them.

what? I think you need to include more of the homework question. oh wait... :p

That is it. Needs to be single dimension array.

Quote:

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The first array will have between 4 to 8 members of integer

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An array can't have "between 4 and 8 members". You can have an array with 8 members and only use 4 of them, if you so choose.

Beyond that it isn't really clear what you need to do. Are you storing age or IQ, or both? Are they supposed to be stored in one array or two?

Well, there has to be a second array that has 6 members of floating point data
type and will be the amount of cash money that each of 6 people have in their pockets . Example: I have $5.32 in my pocket.

Then I gotta allow the person running the program to change the IQ of the 2nd member of the array.
At the end just display the values for each array with a for loop using the sizeof operator to determine the number of members in the array for the test expression.
That's basically it. So I guess it needs to store them.

Quote:

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Originally Posted by XodoX

At the end just display the values for each array with a for loop using the sizeof operator to determine the number of members in the array for the test expression.

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Oh God, is that a requirement? It's bad enough when newbies abuse the sizeof() operator trying to get array lengths that they could just as easily store in a variable somewhere; now teachers are promoting that practice?

Quote:

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Originally Posted by Lindley

Oh God, is that a requirement? It's bad enough when newbies abuse the sizeof() operator trying to get array lengths that they could just as easily store in a variable somewhere; now teachers are promoting that practice?

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Yes, it is.

Forgive me if I'm being redundent, but you are suposed to have an array cabable of carring up to eight integers for IQ's and an array of six floats for the spare change. The program allows you to make changes to the IQ array's second element and display a sizeof() in a for loop to display both arrays size.

Therefore your question is how to asign your elements an IQ? (got this from the first post)

If so, you are correct, this will create and assign a number to the IQ array.

int arrayIQ [8]={0,0,0,0,0,0,0,0};
arrayIQ[2]=100;

of corse, you have to let the human enter the actuall nuber that it becomes correct? So
insead of 100 you would use a variable that user input would set.

int arrayIQ[8]={0,0,0,0,0,0,0,0};
int variableForIQ_subTwo=0;


cin>>variableForIQ_subTwo;

arrayIQ[2]=variableForIQ_subTwo;



If not this, I don't understand your question.

Quote:

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Originally Posted by XodoX

Well, there has to be a second array that has 6 members of floating point data
type and will be the amount of cash money that each of 6 people have in their pockets . Example: I have $5.32 in my pocket.

Then I gotta allow the person running the program to change the IQ of the 2nd member of the array.
At the end just display the values for each array with a for loop using the sizeof operator to determine the number of members in the array for the test expression.
That's basically it. So I guess it needs to store them.

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Ok, then which part is it you're having trouble with?

Quote:

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Originally Posted by ehoi

If so, you are correct, this will create and assign a number to the IQ array.

int arrayIQ [8]={0,0,0,0,0,0,0,0};

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You can actually just do

Code:

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int arrayIQ[8] = { 0 };

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Which will initialize all of the values in the array to zero.

So the one for the six members works the same way?

float arrayIQ[6] = { 0 };

Ok, now I got it.

It's supposed to show about 8 IQ's. Then it displays a message saying that the IQ of the 2nd person has changed, and you need to enter the new IQ. Then it shows the 8 IQ's again, but now of course it gets replaced by the newly entered IQ.

Then it needs to show 5 amounts of cash that these people have ( I know, it's random)

I tried it, but it dosen't compile yet :(

Code:

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// Headers and Other Technical Items

#include <iostream>
using namespace std;

// Function Prototypes

void pause(void);

// Variables

int iq[8]={80,90,100,110,120,120,140,150};
float  cash[] = {'3.45','1.84','1.0','3.10','.2.71','0.89'};

int  x;          // Used as a flag to control for loops

//******************************************************
// main
//******************************************************

int main(void)
  {
  cout << "\nThe oiginal IQ's:" << endl;
  for(x = 0; x < 5; x++)
    {
    cout << iq[x] << endl;
    }

  cout << "\n\nThe second person became smarter, what is his  new IQ ->: ";
  cin >> iq[2];

  cout << "\n\nThe revised IQ:" << endl;
  for(x = 0; x < 5; x++)
    {
    cout << iq[x] << endl;
    }

  pause();

  cout << "\n\nThe cash these people have :" << endl;
  for(x = 0; x < sizeof cash / sizeof cash[0]; x++)
    {
    cout << cash[x] << endl;
    }

  pause();
  return 0;
  }

//******************************************************
// pause
//******************************************************

void pause(void)
  {
  cout << "\n\n";
  system("PAUSE");
  cout << "\n\n";
  return;
  }

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It changes the 3rd IQ, and something with the cash amouts dosen't work either :confused: If I wanted to say "I have xx.x cash in my pocket" , would I have to put it down in the array each time?

Quote:

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Originally Posted by Lindley

Oh God, is that a requirement? It's bad enough when newbies abuse the sizeof() operator trying to get array lengths that they could just as easily store in a variable somewhere; now teachers are promoting that practice?

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Not to mention holding financial information in floats!

Quote:

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Originally Posted by XodoX

...
It changes the 3rd IQ, ...

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you really can't figure out, even by trial and error, how to change that so it changes the third IQ?

also, sigle quotes are for const chars, e.g.

Code:

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char letterR = 'R';

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So

Code:

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char foo = 'bar';

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will probably not give what you expect. Therefore I suggest you revisit

Code:

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float  cash[] = {'3.45','1.84','1.0','3.10','.2.71','0.89'};

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just like your compiler tells you too ;)

If you remember, arrays always start counting at zero, therefore iq[2] is the THIRD element. It goes: iq[0] iq[1] iq[2] etc. Also, make sure you don't place a [number] higher than the array. (like iq[10]) It WILL use it. This usually destroys something else you stored to in doing it.

I got another questiom, I'll just post it here:

Code:

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//******************************************************
// display_array
//******************************************************

void display_array(int things[], int array_size)
  {

  cout << "\n************************************";
  for (int i = 0; i < array_size; i++)
    {
    cout << "\nOffset: " << setw(2) << i;
    cout << " Memeber: " << setw(2) << i+1;
    cout << " value is: " << setw(3) << things[i];
    }
  cout << "\n************************************";

  return;
  }

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That part is displaying an array from another code.

I need to change the display function to list the items horizontally with two spaces between them. What's the best way to do this?