缘由c语言多循环问题！-CSDN论坛
进行哥德巴赫猜想的验证时，不能判断202以上的偶数-编程语言-CSDN问答

bool sushu(int n)
{
	if (n % 2 == 0) return 0;//在这题可有可无，示意可单独处理 && a > 2
	for (int a = 3; a <= n/a; a += 2)//媲美sqrt，更高级的使用即时质数数组
	if (n%a == 0) return 0;
	return 1;
}
void 哥德巴赫猜想表示区间()
{
	int count = 0, i = 3, m, n;
	cout << "输入一个区间m-n :";
	cin >> m >> n;//scanf_s
	if (m<6) m = 6;
	while (m <= n)
	{
		if (sushu(m - i) && sushu(i))
		{
			cout << m << "=" << i << "+" << m - i << ends;//printf
			if (++count % 14 == 0) cout << "\n";
			m += 2; i = 3;
		}
		else if (m - i > 2)i += 2;
		else{ cout << m << endl; m += 2; i = 3; }
	}
}

void 哥德巴赫猜想表示区间()
{
	int m, n, a, b, c, j, k = 0;
	cin >> m >> n;//缘由https://bbs.csdn.net/topics/396240545
	if (m < 6)m = 6;
	for (; m <= n; m += 2, n -= 2)
	{
		for (a = 3; a<n / 2; a += 2, k = 0)
		{
			b = m - a;
			c = n - a;
			for (j = 3; j <= a / 2; j += 2)
			{
				if (a%j == 0){ k = 1; break; }
			}
			if (k)continue;
			for (j = 3; j <= b / 2; j += 2)
			{
				if (b%j == 0){ k = 1; break; }
			}
			if (k)continue;
			for (j = 3; j <= c / 2; j += 2)
			{
				if (c%j == 0){ k = 1; break; }
			}
			if (k){ if (b>1)printf("%d=%d+%d; ", m, a, b); continue; }
			if (b>1)printf("%d=%d+%d; %d=%d+%d;\n", m, a, b, n, a, c); else printf("\n");
			break;
		}
	}
}