一道C++题目

 1 #include <iostream>
 2 using namespace std;
 3
 4 int main()
 5 {
 6     int length;
 7     cout << "样本输入:"<<endl;
 8     cin >> length;
 9     cout << "样本输出:"<<endl;
10     for (int i = 1; i <= length; i++)
11     {
12         for (int j = 1; j <= length; j++)
13         {
14              cout << " ("<<i<<","<<j<<") ";
15              if (j == length)
16              {
17                  cout << "\n";
18              }
19         }
20     }
21     return 0;
22 }