void resizecmat(CMat* A, int r, int c)
{
	if (A == NULL) return;
	if ((A->row == r) && (A->col == c))
		return;

	for (int ri = 0; ri < A->row; ri++)
		tfree(A->d[ri]);

	if (A->d != NULL)
		tfree(A->d);

	A->row = r; A->col = c;
	A->d = (cplx**)tmalloc(sizeof(cplx*) * (size_t)r);

	if (A->d == NULL) return;

	for (int i = 0; i < r; i++)
		A->d[i] = (cplx*)tmalloc(sizeof(cplx) * (size_t)c);
}

Please add comments to this code. Don't change the original input code. Then Explain what the code is doing The words with all capital letters should appear at least 17 times.
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