Thread: invert an array

i have an 8x8 array is there a way to invert it. the way its assigned to the board element 0,0 is bottom left corner and i want to turn the board so 0,0 becomes the top most corner ie

Code:

// way it is now

//7,0 7,1 7,2 7,3 7,4 7,5 7,6 7,7
//6,0 6,1 6,2 6,3 6,4 6,5 6,6 6,7
// etc etc
//1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7
//0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7

//inverted
//0,7 0,6 0,5 0,4 0,3 0,2 0,1 0,0
//1,7 1,6 1,5 1,4 1,3 1,2 1,2 1,1
// etc etc
//6,7 6,6 6,5 6,4 6,3 6,2 6,1 6,0
//7,7 7,6 7,5 7,4 7,3 7,2 7,1 7,0

effectively i have turned the board 180 degrees
many thanks
coop

this is getting on my nerves now

Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i, j , array[8][8], count = 0;

    for (j = 0; j < 8; j++)
    {
        for (i = 0; i < 8; i ++)
        {
            array[i][j] = count;
            count++;
        }
    }

    for (j = 7; j >= 0; j--)//(j = 0; j <8; j++)// swap in
    {
        for (i = 0; i < 8; i ++)//(i = 7; i >= 0; i --)same here swap in
        {
            printf("%d\t", array[i][j]);
        }
        printf("\v\n");
    }
    return 0;
}

//i get the output
//56 57 58 59 60 61 62 63
//48 49 50 51 52 53 54 55
//etc etc
//8  9 10 11 12 13 14 15
//0  1  2  3  4 5  6  7  8

all cool if i change the second set of for loops to:

Code:

    for (j = 0; j <8; j++)  //(j = 7; j >= 0; j--)//(j = 0; j <8; j++)// swap in
    {
        for (i = 7; i >= 0; i --) //(i = 0; i < 8; i ++)//(i = 7; i >= 0; i --)same here swap in
        {
            printf("%d\t", array[i][j]);
        }
        printf("\v\n");
    }

// i get the output:
//  7   6   5   4   3   2 1 0
//15 14 13 12 11 10 9 8
// etc etc
//55 54 53 52 51 50 49 48
//63 62 61 60 59 58 57 56

Bingo just what i wanted!
however

Code:

void draw_board(char board[][ROW_MAX + 1])
{
    int column, row, temp_array[8][8];
    bool change_player = false; //whites go

    if (change_player == false)
    {
        for (row = ROW_MAX; row >= ROW_MIN; row--)
        {
            for (column = COLUMN_MIN; column <= COLUMN_MAX; column++)
            {
                temp_array[column][row] = board[column][row];
            }
        }
    }

    for (row = ROW_MAX; row >= ROW_MIN; row--)
    {
        for (column = COLUMN_MIN; column <= 3; column++)
        {
            if (column == 0)
            {
                printf("   *****************************************************************\n");
            }
            else if (row % 2 == 0)
            {
                if (column % 2 == 0)
                {
                    change_player ? printf(" %d *   %c   *********   %c   *********   %c   *********   %c   *********\n", row, board[0][row], board[2][row], board[4][row], board[6][row]) :
                    printf(" %d *   %c   *********   %c   *********   %c   *********   %c   *********\n", row, temp_array[0][row], temp_array[2][row], temp_array[4][row], temp_array[6][row]);
                }
                else
                {
                    printf("   *       *********       *********       *********       *********\n");
                }
            }
            else
            {
                if (column % 2 == 0)
                {
                    change_player ? printf(" %d *********   %c   *********   %c   *********   %c   *********   %c   *\n",row, board[1][row], board[3][row], board[5][row], board[7][row]) :
                    printf(" %d *********   %c   *********   %c   *********   %c   *********   %c   *\n",row, temp_array[1][row], temp_array[3][row], temp_array[5][row], temp_array[7][row]);
                }
                else
                {
                    printf("   *********       *********       *********       *********       *\n");
                }
            }
        }
    }
    printf("   *****************************************************************\n");
    printf("       0        1       2      3       4       5       6       7    \n");
}

the for loops in the if statment make no difference what so ever to how the pieces appear on the screen!!!
How come?
coop