Thread: Simple 2 dimensional array problem

Hi there everyone, i've just joined the forum as i'm teaching myself c in my lunch hour at work and i'm sick of getting frustrated!

I've set myself a problem to tackle and i'm going to try and get a working solution and as i learn more, maybe optimise the code a bit as no doubt it will be quite crude.

I've hit a sticking point with a 2 dimensional array.

Basically i want to have a 9x9 matrix or array which looks like this:

012345678
012345678
012345678
012345678
012345678
012345678
012345678
012345678
012345678

Obviously my code is pretty crude but i'm just learning!

Code:

#include <stdio.h>

int main()
{

// **********************
//initialise variables
int originalarray[8][8]; // 9x9 matrix
int x, y, c;
//***********************


for (x = 0; x <= 8; x++) // Goes through rows
{
	for (y = 0; y <= 8; y++) //Goes through columns
	{
	//scanf( "%d", &c ); // reads character input
	originalarray[x][y] = y; // makes the integer value of the matrix equal to the column number
	}
}

for (x = 0; x <= 8; x = x++) //Goes through rows
{	printf("\n"); //print newline
		for (y = 0; y <= 8; y = y++) //Goes through columns
		{
		printf("%d", originalarray[x][y]); // prints each value of the matrix in turn
		}
}


}

So thats my code, the scanf bit is commented out as i was originally going to read in from the keyboard but i was trying to make it simlpler because it is failing.

Anyway, my output is this:
(don't know if i should put this in code tags)

Code:

012345670
012345670
012345670
012345670
012345670
012345670
012345670
012345670
Segmentation fault (core dumped)

As you can see there are only 8 rows and the end column is just zeros!
I would be very grateful if anyone could help here. Maybe i'll post the rest of my little problem up as i get more done so you can laugh at me and/or help optimise my code!

Thank you in advance for your time.
Simon.

Wow that was quick!

I'm sorry i don't understand...

The array called

Code:

int originalarray[8][8]

should be an 81 term 9x9 matrix. Each term will only be single digit integers. (0-9)

Is that ok? Sorry if i didn't answer your question!
Si

Ah Excellent!

Thats great thanks!

I was thinking that the two numbers were inclusive of zero. Hence i've now done

Code:

originalarray[9][9]

and it works fine!

Thank you Mats for a very quick response!