• To print pyramid triangle in C++, we have use two for loop, the outer for loop and the inner for loop.
• The outer for loop is responsible for rows and the inner for loop is responsible for column.
• C++ programs to print different types of patterns using stars(*), numbers, and characters or alphabets.
• This C++ program prints the full pyramid using stars(*).

Sample Code in C++

#include <iostream>
using namespace std;
   int main()
{
    int j, rows;
       cout <<"Enter number of rows: ";
    cin >> rows;
       for(int i = 1, k = 0; i <= rows; ++i, k = 0)
    {
        for(j = 1; j <= rows-i; ++j)
        {
            cout <<"  ";
        }
        while(k != 2*i-1)
        {
            cout << "* ";
            ++k;
        }
        cout << endl;
    }    
    return 0;
}

Output

Enter number of rows : 7   
            * 
          * * * 
        * * * * * 
      * * * * * * * 
    * * * * * * * * * 
  * * * * * * * * * * * 
* * * * * * * * * * * * * 

• Pattern programs in C print various patterns of numbers and stars. These codes explain how to create various patterns using C programming. The C programs involve usage of nested for loops (a for loop inside a for loop).
• A pattern of numbers, star or characters is a way of arranging these in some logical manner or they may form a sequence. Some of these patterns are triangles which have special importance in mathematics.