Spiral Matrix

#include <stdio.h>
#define R 3
#define C 3

void spiralPrint(int m, int n, int a[R][C])
{
int i, k = 0, l = 0;

/* k - starting row index
m - ending row index
l - starting column index
n - ending column index
i - iterator
*/

while (k < m && l < n)
{
/* Print the first row from the remaining rows */
for (i = l; i < n; ++i)
{
printf("%d ", a[k][i]);
}
k++;

/* Print the last column from the remaining columns */
for (i = k; i < m; ++i)
{
printf("%d ", a[i][n-1]);
}
n--;

/* Print the last row from the remaining rows */
if ( k < m)
{
for (i = n-1; i >= l; --i)
{
printf("%d ", a[m-1][i]);
}
m--;
}

/* Print the first column from the remaining columns */
if (l < n)
{
for (i = m-1; i >= k; --i)
{
printf("%d ", a[i][l]);
}
l++;
}
}
}

/* Program to test above functions */
int main()
{
int a[R][C] = { {1, 2, 3},
{8, 9, 4},
{7, 6, 5}
};

spiralPrint(R, C, a);
return 0;
}

   

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