Print a given matrix in spiral form.

Question

Accepted Answer

The algorithm prints a given matrix in a spiral form.

Iterate through the matrix in a spiral pattern
Keep track of the boundaries of the spiral
Print the elements in the spiral order

Accepted Answer

#include #define R 3 #define C 6 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++; } } } /* Driver program to test above functions */ int main () { int a[R][C] = { {1, 2, 3, 4, 5, 6}, {7, 8, 9, 10, 11, 12}, {13, 14, 15, 16, 17, 18} }; spiralPrint (R, C, a); return 0; }

Print a given matrix in spiral form.

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