Hollow Diamond

 #include<iostream>

using namespace std;

int main()

{

int size, z = 1;

cout << "Enter size of  Diamond:  ";

cin >> size;

for (int i = 0; i <= size; i++)

{

for (int j = size; j > i; j--)

{

cout << " ";

}

cout << "*";

if (i > 0)

{

for (int k = 1; k <= z; k++)

{

cout << " ";

}

z += 2;

cout << "*";

}

cout << endl; 

}

z -= 4;

for (int i = 0; i <= size - 1; i++)

{

for (int j = 0; j <= i; j++)

{

cout << " ";

}

cout << "*";

for (int k = 1; k <= z; k++)

{

cout << " ";

}

z -= 2;

if (i != size - 1)

{

cout << "*";

}

cout << endl;

}

system("pause");

return 0;

}