Ubuntu-gr Forum

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

#define NUM_CHARS (int) sizeof(alphabeta) / sizeof(alphabeta[0])

#define NUM_ROWS 10
#define NUM_COLUMNS 10

int main(void)
{
    int move, row = 0, col = 0;
    const char alphabeta[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
                               'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
                               'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
    char table[NUM_ROWS][NUM_COLUMNS] = {{alphabeta[0]}};

    srand((unsigned) time(NULL));

    for (int i = 1; i < NUM_CHARS; i++) {
        if (table[row+1][col] && table[row-1][col] && table[row][col+1] && table[row][col-1])
            break;

        while (1) {
            move = rand() % 4;
            if (move == 0) {
                if ((! table[row-1][col]) && row - 1 >= 0) {
                    row--;
                    break;
                }
            }
            else if (move == 1) {
                if ((! table[row][col+1]) && col + 1 < NUM_COLUMNS) {
                    col++;
                    break;
                }
            }
            else if (move == 2) {
                if ((! table[row+1][col]) && row + 1 < NUM_ROWS) {
                    row++;
                    break;
                }
            }
            else if (move == 3) {
                if ((! table[row][col-1]) && col - 1 >= 0) {
                    col--;
                    break;
                }
            }
        }
        table[row][col] = alphabeta[i];
    }

    for (row = 0 ; row < NUM_ROWS; row++) {
        for (col = 0; col < NUM_COLUMNS; col++)
            table[row][col] ? printf("%c ", table[row][col]) : printf(". ");
        printf("\n");
    }

    return 0;
}