Computer Science Canada

About Structures and Nested Arrays
Author:  ahsonmonis [ Thu Oct 22, 2009 12:38 am ]
Post subject:  About Structures and Nested Arrays
struct event schedule[] = {{{9,45},{9,55}},{{13,0},{14,20}},{{15,0},{16,30}}};

So how can I read each individual entry?

I want to use this and compare it to an integer.

So basically lets say i have h = 9,

I want to see if h>9 or h<9 and h>13 or h<14 and h>15 or h<16
but i cant access the numbers in the schedule array because it is an array of arrays.

How can I see what the first element is, the second element etc.
Author:  OneOffDriveByPoster [ Thu Oct 22, 2009 12:23 pm ]
Post subject:  Re: About Structures and Nested Arrays
First, some formatting:
c:
struct event schedule[] = {
   {{ 9, 45}, { 9, 55}},
   {{13,  0}, {14, 20}},
   {{15,  0}, {16, 30}}
};


Then, it may help if you provided a declaration of struct event.
c:
struct event {
   int a[2], b[2];
};


Then, you can try something like:
c:
schedule[0].a[0]
Author:  ahsonmonis [ Thu Oct 22, 2009 6:43 pm ]
Post subject:  Re: About Structures and Nested Arrays
I tried it but gave errors.

code:
struct event schedule[] = {{{9,45},{9,55}},{{13,0},{14,20}},{{15,0},{16,30}}};


Ok purpose: Print the first entry and then print the second last entry.
So output be like 9, 16

How can I do that.


code:

// File name is arrayHelp.c
#include <stdio.h>
#include "arrayHelp.h"

int main (void)
{
  struct event schedule[] = {{{9,45},{9,55}},{{13,0},{14,20}},{{15,0},{16,30}}};

  struct event {
   int a[2], b[2], c[2];
   };

 printf ("%d\n",schedule[0].a[0]);
 printf ("%d\n",schedule[1]);
 printf ("%d\n",schedule[2]);
 
 system ("pause");
 return 0;
}



code:

// Filename is arrayHelp.h

  struct tod {
    int hour, minute;
  };

  struct event {
    struct tod start, end;
  };
 
  int freetime (struct event schedule[], int n, int hour, int min);


It is still giving me an error. I attached the programs as well.
Author:  ahsonmonis [ Thu Oct 22, 2009 6:44 pm ]
Post subject:  Re: About Structures and Nested Arrays
oh also, how do u add code tags so it is properly formatted and colored.
Author:  OneOffDriveByPoster [ Thu Oct 22, 2009 10:08 pm ]
Post subject:  Re: About Structures and Nested Arrays
ahsonmonis @ Thu Oct 22, 2009 6:44 pm wrote:
oh also, how do u add code tags so it is properly formatted and colored.
You can see how by clicking on the "quote" button on the top-right corner of a post that has that. It will only get you the colour though. Space it yourself, or dump it in something that will auto-format first.

Anyhow, when I said to provide a declaration, I meant to the forum. The code I gave was only an example. You do have a declaration in your code already. To access a struct member correctly, it is necessary to know how the struct type was declared.

Your relevant declarations are:
c:
struct tod {
   int hour, minute;
};

struct event {
   struct tod start, end;
};


So you can refer to the `9' like so:
c:
schedule[0].start.hour
Author:  AtoZ [ Fri Oct 23, 2009 3:37 am ]
Post subject:  Re: About Structures and Nested Arrays
Thanks alot. That is exactly what I was looking for.

:


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