Spiral View (without using arrays)

[Bchandaria]

Any one can help me out i want to display a spiral of n*n size with out using arrays?

out put when n=2 should be 3 2
                           0 1
when n=3 should be 8 7 6
                   1 0 5
                   2 3 4

when n=4 should be 15 14 13 12
                   04 03 02 11
                   05 00 01 10
                   06 07 08 09

[Gonbe]

Something like this?

#include <stdio.h>
#include <assert.h>

void DrawSpiralLine(const int n, const int line)
{
    // Throw an assertion when faulty parameters are supplied.
    assert(line >= 0 && line < n && n > 0);

    const int square = n * n;
    int       i      = 0;

    // Simple case: The first line of a spiral.
    if (line == 0)
    {
        for (i = 0; i < n; i++)
        {
            printf("%02d ", (square - 1) - i);
        }
    }

    // Simple case: The last line of a spiral.
    else if (line == (n - 1))
    {
        for (i = 0; i < n; i++)
        {
            printf("%02d ", square - (3 * n) + 2 + i);
        }
    }

    // Complex case: Line with other inner spirals.
    else
    {
        // Print the first character.
        printf("%02d ", square - (4 * n) + 4 + (line - 1));

        // Print a line of the rest
        DrawSpiralLine(n - 2, line - 1);

        // Print the last character
        printf("%02d ", (square - 1) - n - (line - 1));
    }
}

void DrawSpiral(const int n)
{
    int i = 0;

    // Draw the lines of the spiral.
    for (i = 0; i < n; i++)
    {
        DrawSpiralLine(n, i);
        printf("\n");
    }
}

int main(void)
{
    DrawSpiral(6);
    return 0;
}

DrawSpiral(6) will draw something like:

35 34 33 32 31 30
16 15 14 13 12 29
17 04 03 02 11 28
18 05 00 01 10 27
19 06 07 08 09 26
20 21 22 23 24 25

Let me know if there's anything specific you want to know, I think it's pretty straight forward. (Recursive solutions are often pretty easy to read)

[ahmedhamdy]

how you arange output ???
i mean why 8 print as fist element in output when n=2
?????????????????

[ahmedhamdy]

if you use console screen
you can use gotoxy() function to draw output

[deceptikon]

you can use gotoxy() function to draw output

gotoxy() isn't widely implemented by compilers. You're essentially assuming that the OP is using Turbo C, which isn't a safe assumption.

[ahmedhamdy]

yes i know
so that i telod to him

if you use console screen

[deceptikon]

The "console screen" isn't unique to Turbo C. Your suggestion is still very poor and makes unwarranted assumptions about the OP's compiler and operating system.

[ahmedhamdy]

you are right