Write a C++ program to print the hollow square with both the diagonals of star pattern using for loop.
#include<iostream>
using namespace std;
int main()
{
int i, j, side;
cout << "Enter Side of a Hollow Square with Diagonals = ";
cin >> side;
cout << "Hollow Square Star With Diagonals Pattern\n";
for(i = 1; i <= side; i++)
{
for(j = 1; j <= side; j++)
{
if (i == 1 || i == side || i == j ||
j == 1 || j == side || j == side - i + 1)
{
cout << "* ";
}
else {
cout << " ";
}
}
cout << "\n";
}
return 0;
}

This C++ example prints the hollow square with the diagonals pattern of a given character using a while loop.
#include<iostream>
using namespace std;
int main()
{
int i, j, side;
char ch;
cout << "Enter Side of a Hollow Square with Diagonals = ";
cin >> side;
cout << "Enter Symbol for Hollow Square with Diagonals = ";
cin >> ch;
cout << "Hollow Square With Diagonals Pattern\n";
for(i = 1; i <= side; i++)
{
for(j = 1; j <= side; j++)
{
if (i == 1 || i == side || i == j ||
j == 1 || j == side || j == side - i + 1)
{
cout << ch << " ";
}
else {
cout << " ";
}
}
cout << "\n";
}
return 0;
}
Enter Side of a Hollow Square with Diagonals = 16
Enter Symbol for Hollow Square with Diagonals = #
Hollow Square With Diagonals Pattern
# # # # # # # # # # # # # # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # # # # # # # # # # # # # #