How to print inverted half-star pyramid pattern next to each other? - c++

Question

I want to display an inverted half-star pyramid pattern next to each other.Here's the desired output
And here's my code:
#include <iostream>
using namespace std;
int main()
{
int n, x, y, k;
cout << "Enter Number of Rows: ";
cin >> n;
for (x = n; x >= 1; x--)
{
for (y = 1; y <= x; y++)
{
if (y <= x)
cout << "*";
else
cout << " ";
}
for (y = n; y >= 1; y--)
{
if (y <= x)
cout << "*";
else
cout << " ";
}
cout << "\n";
}
return 0;
}
Here's the output I got after running the code.
The number of rows desired is 10.
After running my code, the output isn't like what I expected. Please tell me how to make it right.
Thank you.

Answer 1

I saw some symmetries in the problem
for n rows, we're printing 2*n+1 characters
for the yth row, we're printing an asterisk if x is less than n-y or more than n+y
So I coded a single double loop with the more complex if statement. I had to adjusted the if statement until it worked.
#include <iostream>
using namespace std;
int main()
{
int n, x, y;
cout << "Enter Number of Rows: ";
cin >> n;
for (y = 0; y < n; y++)
{
for (x = 2*n+1; x > 0; x--)
{
if ((x > n+y+1) || (x < n-y+1))
cout << "*";
else
cout << " ";
}
cout << "\n";
}
return 0;
}

Answer 2

Well, you need to change your logic a little bit rest all is fine.
Here is the code:-
#include <iostream>
using namespace std;
int main()
{
int n, x, y, k;
cout << "Enter the number of Rows: ";
cin >> n;
for(x = 1; x <= n; x++)
{
for(y = n; y >= 1; y--)
{
if(y <= x)
cout << " ";
else
cout << "*";
}
for(y = 1; y <= n; y++)
{
if(y <= x)
cout << " ";
else
cout << "*";
}
cout << "\n";
}
return 0;
}
Explanation:- I am starting from row 1 and going till row "n". Now I need to print two different inverted flags so I used two for loops for that. In one loop I am starting from column "n" and going till row >1 and in the other loop, I am doing the just opposite of that so that both flags will be opposite to each other. Just try to understand this code by taking X as row and Y as column.