int a[10][10]={0};
                int n, holes, noofelements, randomno, rowpos, colpos; 
	int i,j;
	srand(time(NULL));
	do
	{
	 printf("Enter the size of the square (+ve integer, max 257): ");
	 scanf("%d", &n);
	 if (n<1 || n>256)
		 printf("Invalid size.");
	}
	while (n<1 || n>256);
	do
	{
	 printf("Enter the number of holes (max %d): ", n/2);
	 scanf("%d", &holes);
	}
	while (holes>(n/2));
	noofelements=n*n-holes;
	for (i=1; i<=noofelements; i++)
	{
		rowpos=rand()%n;
		colpos=rand()%n;
		a[rowpos][colpos]=i;
	}
	for (i=0; i<n; i++)
	{
		for (j=0; j<n; j++)
			printf("%d\t", a[i][j]);
		printf("\n");
	}

const int MaxSize = 10
int a[MaxSize][MaxSize];
...
...
if (n<1 || n>MaxSize)

Enter the size of the square (+ve integer, max 257): 5
Enter the number of holes (max 2): 2
-1      -1      8       19      11
16      -1      17      12      -1
-1      -1      -1      2       21
-1      -1      4       -1      20
10      18      22      15      23
Press any key to continue

const int MaxN = 10;
...
...
	for(i = 0; i < MaxN; i++)
	{
		 for(j = 0; j < MaxN; j++)
			 a[i][j] = -1;
	}
...
...
... // code omotted
...
	for (i=1; i<=noofelements; i++)
	{
		do {
			rowpos=rand() % n;
			colpos=rand() % n;
		} while( a[rowpos][colpos] >= 0);
		a[rowpos][colpos]=i;
	}