练习代码时的问题，求帮看

Question

输入的代码运行时只显示了前半段，后半段没有显示，不知道怎么回事，求帮解决

Answer 1

 #include <iostream>
using namespace std;
int main()
{
for (int i = 1; i <= 4; i++)
{
for (int j = 1; j <= 4 - i; j++) cout << " ";
for (int k = 1; k <= 2 * i - 1; k++) cout << "*";
cout << endl;
}
for (int i = 3; i > 0; i--)
{
for (int j = 1; j <= 4 - i; j++) cout << " ";
for (int k = 1; k <= 2 * i - 1; k++) cout << "*";
cout << endl;
}
}

http://codepad.org/KMQoQMcz