= t2; t2 = next;
		next = t1 + t2;
	}
	printf("\n");
	return 0;
}
</pre>

<pre id="code_print_prime">
// Copyright 2016 ChaiShushan &lt;chaishushan{AT}gmail.com&gt;. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include &lt;stdio.h&gt;

int is_prime(int n) {
	int i;
	i = 2;
	while(i*i <= n) {
		if(n%i == 0) return 0;
		i++;
	}
	return 1;
}

int main() {
	int i;
	i = 2;
	while(i < 20) {
		if(is_prime