Pattern consisting of numbers moving in clockwise direction around a rectangular shape (length and breadth decreasing each time) [closed]

Answer 1

#include 
#include 

#define SIZE 5

#define RIGHT 1
#define DOWN 2
#define LEFT 3
#define UP 4


void printArray1(int b[SIZE][SIZE], int size);
void printArray2(int b[SIZE][SIZE], int size);
int move(int b[SIZE][SIZE], int *xpos, int *ypos, int *movem, int number);


int main(void) {


    int i, j, num;
    int dir;
    int a[SIZE][SIZE] = { 0 }; 

    printArray1(a, SIZE);
    printf("\n\n");
    printArray2(a, SIZE);

    dir = RIGHT;
    i = 0;
    j = 0;
    num = 1;
    for (; num <= (SIZE * SIZE); num++ )
        move(a, &i, &j, &dir, num);

    printArray1(a, SIZE);

    printf("\n\n");

    printArray2(a, SIZE);

    return 0;
}




void printArray1 (int b[SIZE][SIZE], int size)
{
    int i, j;
    for ( i = 0; i < size; i++ ) {
        for ( j = 0; j < size; j++ )
            printf("%3d  ", b[j][i]);
        printf("\n");
    }
    printf("\n\n");
    return;
}

void printArray2 (int b[SIZE][SIZE], int size)
{
    int i, j;
    for ( i = 0; i < size; i++ ) {
        for ( j = 0; j < size; j++ )
            printf("%3d  ", b[i][j]);
        printf("\n");
    }
    printf("\n\n");
    return;
}



int move(int b[SIZE][SIZE], int *xpos, int *ypos, int *movem, int number)
{

    int x, y, dirn, reqdDirn;

    x = *xpos;
    y = *ypos;
    dirn = *movem;

    if (b[x][y] == 0 ) {
        b[x][y] = number;
    }


    reqdDirn = dirn;

    switch (dirn) {
    default:
        printf("Unexpected value");
        return;

    case RIGHT:
        x = x + 1;
        if (b[x][y] == 0) {
            if (x > SIZE-1) {
                reqdDirn = DOWN;
                x = SIZE - 1;
                y = y + 1;
                if (y > SIZE-1)
                    y = SIZE - 1;
            }
        } else {
            // just step back and change direction
            x = x - 1;
            y = y + 1;
            reqdDirn = DOWN;
        }
        break;
    case DOWN:
        y = y + 1;
        if (b[x][y] == 0) {
            if (y > SIZE-1) {
                reqdDirn = LEFT;
                y = SIZE - 1;
                x = x - 1;
                if (x < 0)
                    x = 0;
            }
        } else {
            y = y - 1;
            x = x - 1;
            reqdDirn = LEFT;
        }
        break;
    case LEFT:
        x = x - 1;
        if (b[x][y] == 0) {
            if (x < 0) {
                reqdDirn = UP;
                x = 0;
                y = y - 1;
                if (y < 0)
                    y = 0;
            }
        } else {
            // just step back and change direction
            x = x + 1;
            y = y - 1;
            reqdDirn = UP;
        }
        break;
    case UP:
        y = y - 1;
        if (b[x][y] == 0) {
            if (y < 0) {
                reqdDirn = RIGHT;
                y = 0;
                x = x + 1;
                if (x > SIZE-1)
                    x = SIZE - 1;
            }
        } else {
            // just step back and change direction
            y = y + 1;
            x = x + 1;
            reqdDirn = RIGHT;
        }
        break;

    }


    *xpos = x;
    *ypos = y;
    *movem = reqdDirn;

}


 Output

  1    2    3    4    5  
 16   17   18   19    6  
 15   24   25   20    7  
 14   23   22   21    8  
 13   12   11   10    9  




  1   16   15   14   13  
  2   17   24   23   12  
  3   18   25   22   11  
  4   19   20   21   10  
  5    6    7    8    9