程序简化。

#include 
using namespace std;
int main()
{
	int a, b, c, d, e, f, g, h, m, n, o, p, i, j;
	cout << "请输入四个整数！" << endl;
	while (1)
	{
		cin >> a >> b >> c >> d;
		e = (a > b) ? a : b;
		f = (c > d) ? c : d;
		g = (e > f) ? e : f;
		h = (e > f) ? f : e;
		m = (a > b) ? b : a;
		n = (c > d) ? d : c;
		o = (m > n) ? m : n;
		p = (m > n) ? n : m;
		i = (o > h) ? o : h;
		j = (o > h) ? h : o;
		cout << "由小到大依次为" 
			<< p <<" " 
			<< j <<" " 
			<< i <<" " 
			<< g << endl;
	}
	return 0;
}