【编写函数求表达式的值】2024-4-3

缘由这个代码哪里错了，运行结果不正确_编程语言-CSDN问答

void 编写函数求表达式的值()
{//缘由https://ask.csdn.net/questions/8082962
	int n = 0, a = 1, b = 3;
	double h = 1.0, c = a, d = b;
	cin >> n; //scanf_s("%d", &n); 
xh:if (--n)
{
	h += c / d;
	a += 1; c *= a;
	b += 2, d *= b;
	goto xh;
}
   cout << fixed << setprecision(10) << h << "\n";
   //printf_s("%0.10f\n", h);
}