格式错误,后来发现缺了个endl。
题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=2000
#include <iostream>
using namespace std;
void swi(char &a, char &b);
int main()
{
char a[3];
while (cin >> a[0]>>a[1]>>a[2])
{
if (a[0] > a[1]) swi(a[0], a[1]);
if (a[1] > a[2]) swi(a[1], a[2]);
if (a[0] > a[1]) swi(a[0], a[1]);
cout << a[0] << " " << a[1] << " " << a[2] << endl;
}
}
void swi(char &a, char &b)
{
char t = a;
a = b;
b= t;
}