spiralArray.cpp

// C++. program for the above approach
#include <iostream>
using namespace std;

#define R 4
#define C 4

// Function for printing matrix in spiral
// form i, j: Start index of matrix, row
// and column respectively m, n: End index
// of matrix row and column respectively
void print(int arr[R][C], int i, int j, int m, int n)
{
	// If i or j lies outside the matrix
	if (i >= m or j >= n)
		return;

	// Print First Row
	for (int p = j; p < n; p++)
		cout << arr[i][p] << " ";

	// Print Last Column
	for (int p = i + 1; p < m; p++)
		cout << arr[p][n - 1] << " ";

	// Print Last Row, if Last and
	// First Row are not same
	if ((m - 1) != i)
		for (int p = n - 2; p >= j; p--)
			cout << arr[m - 1][p] << " ";

	// Print First Column, if Last and
	// First Column are not same
	if ((n - 1) != j)
		for (int p = m - 2; p > i; p--)
			cout << arr[p][j] << " ";

	print(arr, i + 1, j + 1, m - 1, n - 1);
}

// Driver Code
int main()
{

	int a[R][C] = { { 1, 2, 3, 4 },
					{ 5, 6, 7, 8 },
					{ 9, 10, 11, 12 },
					{ 13, 14, 15, 16 } };

	// Function Call
	print(a, 0, 0, R, C);
	return 0;
}
// This Code is contributed by Ankur Goel