用冒泡法给四个数据排序

#include<iostream>
using namespace std;
void main()
{
int a[4], i, j, t;
for (i = 1; i <= 4; i++)
cin >> a[i];
for (i = 1; i <= 3; i++)
for (j = 1; j <= 4 - i; j++)
if (a[j] > a[j + 1])
{
t = a[j];
a[j] = a[j + 1];
a[j + 1] = t;


}
for (i = 1; i <= 4; i++)
cout << a[i] << "";
}