beginning array question

**serruya** · 04-30-2003

I really don't understand what you want completely, but I get an figure now, please try the bottom program, and tell me what you want to do:

Code:

#include <stdio.h>

int main(void)
{
	int myArr[3][3];
	int i, j;

	//initialise the array, all values to 0
	for (i=0; i<3; i++)
		for (j=0; j<3; j++)
			myArr[i][j] = 0;

	//loop and print the position
		for (i=0; i<3; i++) {
			for (j=0; j<3; j++)
				printf("You are at myArr[%d][%d]!\n", i, j);
			putchar('\n');
		}
	
	return 0;
}

The output of this program in my machine:

Code:

You are at myArr[0][0]!
You are at myArr[0][1]!
You are at myArr[0][2]!

You are at myArr[1][0]!
You are at myArr[1][1]!
You are at myArr[1][2]!

You are at myArr[2][0]!
You are at myArr[2][1]!
You are at myArr[2][2]!

Press any key to continue

**Noobie** · 04-30-2003

Lets say I was trying to make a chessboard: the long code below will output the position of the chess pieces for the 8th rank, as I can set a8=1 and there is a pawn on a8; or h8=9 and there is a queen on h8; or e8=0 and nothing is on e8

I was hoping to use an array[8][8] to do something like this...but in order to do that I would need to set array[4][3]=6; and then check to see whether array[4][3]=6; as 6 represents a chesspiece.

But apparently Im not understanding something about arrays, I thought an array[8][8] would have 64 different slots to which I could assign 64 different values, but Im not sure how to set those values and then see what they are within an if statement.

Code:

void board()
{
if (a8==-1)
{
textcolor(BROWN);
cprintf("            _");
}
if (a8==3)
{
textcolor(LIGHTBLUE);
cprintf("            n");
}
if (a8==4)
{
textcolor(LIGHTBLUE);
cprintf("            n");
}
if (a8==6)
{
textcolor(LIGHTBLUE);
cprintf("            r");
}
if (a8==9)
{
textcolor(LIGHTBLUE);
cprintf("            q");
}
if (a8==0)
{
textcolor(LIGHTBLUE);
cprintf("            k");
}
if (a8==10)
{
textcolor(LIGHTRED);
cprintf("            K");
}
if (a8==13)
{
textcolor(LIGHTRED);
cprintf("            N");
}
if (a8==14)
{
textcolor(LIGHTRED);
cprintf("            B");
}
if (a8==16)
{
textcolor(LIGHTRED);
cprintf("            R");
}
if (a8==19)
{
textcolor(LIGHTRED);
cprintf("            Q");
}
if (b8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (b8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (b8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (b8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (b8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (b8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (b8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (b8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (b8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (b8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (b8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (c8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (c8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (c8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (c8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (c8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (c8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (c8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (c8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (c8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (c8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (c8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (d8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (d8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (d8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (d8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (d8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (d8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (d8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (d8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (d8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (d8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (d8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (e8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (e8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (e8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (e8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (e8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (e8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (e8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (e8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (e8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (e8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (e8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (f8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (f8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (f8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (f8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (f8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (f8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (f8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (f8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (f8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (f8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (f8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (g8==-1)
{
textcolor(BROWN);
cprintf(" _");
}
if (g8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n");
}
if (g8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b");
}
if (g8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r");
}
if (g8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q");
}
if (g8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k");
}
if (g8==10)
{
textcolor(LIGHTRED);
cprintf(" K");
}
if (g8==13)
{
textcolor(LIGHTRED);
cprintf(" N");
}
if (g8==14)
{
textcolor(LIGHTRED);
cprintf(" B");
}
if (g8==16)
{
textcolor(LIGHTRED);
cprintf(" R");
}
if (g8==19)
{
textcolor(LIGHTRED);
cprintf(" Q");
}
if (h8==-1)
{
textcolor(BROWN);
cprintf(" _\r\n");
}
if (h8==3)
{
textcolor(LIGHTBLUE);
cprintf(" n\r\n");
}
if (h8==4)
{
textcolor(LIGHTBLUE);
cprintf(" b\r\n");
}
if (h8==6)
{
textcolor(LIGHTBLUE);
cprintf(" r\r\n");
}
if (h8==9)
{
textcolor(LIGHTBLUE);
cprintf(" q\r\n");
}
if (h8==0)
{
textcolor(LIGHTBLUE);
cprintf(" k\r\n");
}
if (h8==10)
{
textcolor(LIGHTRED);
cprintf(" K\r\n");
}
if (h8==13)
{
textcolor(LIGHTRED);
cprintf(" N\r\n");
}
if (h8==14)
{
textcolor(LIGHTRED);
cprintf(" B\r\n");
}
if (h8==16)
{
textcolor(LIGHTRED);
cprintf(" R\r\n");
}
if (h8==19)
{
textcolor(LIGHTRED);
cprintf(" Q\r\n");
}

**Noobie** · 04-30-2003

int maploc[3][3]={0};
maploc[0][0]=1;

I assume the above set element[0][0] to a value of 1. Now I want to write an if statement that says

if (maploc[0][0]=1)

**Noobie** · 04-30-2003

I think I just answered my question!

**serruya** · 04-30-2003

Hah good luck with your program

**Noobie** · 04-30-2003

This code outputs a 3x3 map, in which 2 areas have been marked for some reason or other, one area marked blue, and other is red.

Code:

void mapdisplay()
{
int x,y;
int maploc[4][4]={0};
maploc[0][2]=2;
maploc[2][1]=1;

for (x=0; x<4; x++)
{
y=3;
maploc[x][y]=-1;
}

for (y=0; y<4; y++)
{
x=3;
maploc[x][y]=-2;
}

y=0;
for (x=0; x<4; x++)
{
for (y=0; y<4; y++)
{
if (maploc[x][y]==0)
{
cout<< " *";
}
if (maploc[x][y]==1)
{
textcolor(LIGHTBLUE);
cprintf(" *");
}
if (maploc[x][y]==2)
{
textcolor(LIGHTRED);
cprintf(" *");
}
if (maploc[x][y]==-1)
{
cout<<"\n";
}
if (maploc[x][y]==-2)
{
cout<<" ";
}
}
}
}

**serruya** · 04-30-2003

Your code looks like C++, you're using cout... hmm and don't forget you're in a C board, and not C++ board.

Waltp · 05-01-2003

Let's assume you have the following 'map' which is 3 by 3

map=
2 4 9
5 3 6
1 7 8

map[0][0] contains 2
map[1][1] contains 3
map[2][0] contains 1
etc.

map[0] is an array containing 2,4,9

Therefore, when you use 2 index values (map[1][2]) you are looking at a specific value in the matrix, row 1, col 2 (value 6).

Using one index specifies a full row.

Another definition, map is 2 by 4:
3 5 7 2
4 1 8 6

map[0][0] is 3
map[0][3] is 2
map[1][2] is 8
and so on...

Does that help?

Thread: beginning array question

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