Hollow Square

 #include<iostream>

using namespace std;

int main()

{

int num;

cout << "Enter Number : ";

cin >> num;

for (int i = 1; i <= num; i++)

{

for(int j=1;j<=num;j++)

{

if (i == 1 || i == num || j == 1 || j == num)

cout << " * ";

else

cout << "   ";

}

cout << endl;

}

system("pause");

return 0;

}