C++ Program To Print Pyramid Pattern and Hollow Pyramid Pattern

 What is Pyramid Pattern And Hollow Pyramid Pattern?

(i) Pyramid Pattern

Program:

#include <iostream>
using namespace std;

int main()
{
    int n;	//Input number of rows
    cout<<"Enter no. of rows: ";
    cin>>n;
    
    for(int i=0;i<n;i++)	//loop to terminate line
    {
        for(int j=0;j<n-i-1;j++)	//loop to print spaces to make the pyramid pattern
        cout<<"  ";
        
        for(int k=0;k<i+1;k++)	//loop to print *
        {
            cout<<"* "<<"  ";
        }
        cout<<endl;
    }
    return 0;
}

Output:

     *

    * *

   * * *

  * * * *

 * * * * *

(ii) Hollow Pyramid Pattern

Program:

#include <iostream>
using namespace std;

int main()
{
    int n;
    cout<<"Enter no. of rows: ";
    cin>>n;
    
    for(int i=0;i<n;i++)	//loop to terminate line
    {
        for(int j=0;j<n-i-1;j++)	//loop to print spaces
        cout<<"  ";
        
        for(int k=0;k<i+1;k++)	//loop to print * at boundaries and spaces in rest of index
        {
            
            if(i==0 || k==0 || i==n-1 || k==i)
            cout<<"* "<<"  ";
            
            else
            cout<<"  "<<"  ";
        }
        cout<<endl;
    }
    return 0;
}

Output:

     *

    * *

   *   *

  *     *

 * * * * *