C++ Program to Print Triangle of Same Alphabets Pattern

Write a C++ program to print triangle of same alphabets pattern in each row using for loop.

#include<iostream>
using namespace std;

int main()
{
	int rows;

	cout << "Enter Triangle of Same Row Alphabets Rows = ";
	cin >> rows;

	cout << "Printing Triangle of Same Alphabets in each Row\n";

	int alphabet = 65;

	for (int i = 0; i <= rows - 1; i++)
	{
		for (int j = rows - 1; j > i; j--)
		{
			cout << " ";
		}
		for (int k = 0; k <= i; k++)
		{
			cout << char(alphabet + i) << " ";
		}
		cout << "\n";
	}
}

C++ program to print the triangle pattern of same row alphabets using a while loop.

#include<iostream>
using namespace std;

int main()
{
	int rows;
	
	cout << "Enter Triangle of Same Row Alphabets Rows = ";
	cin >> rows;

	cout << "Printing Triangle of Same Alphabets in each Row\n";

	int i, j, k, alphabet = 65;

	i = 0;
	while (i <= rows - 1)
	{
		j = rows - 1;
		while (j > i)
		{
			cout << " ";
			j--;
		}

		k = 0;
		while (k <= i)
		{
			cout << char(alphabet + i) << " ";
			k++;
		}

		cout << "\n";
		i++;
	}
}

Enter Triangle of Same Row Alphabets Rows = 13
Printing Triangle of Same Alphabets in each Row
            A 
           B B 
          C C C 
         D D D D 
        E E E E E 
       F F F F F F 
      G G G G G G G 
     H H H H H H H H 
    I I I I I I I I I 
   J J J J J J J J J J 
  K K K K K K K K K K K 
 L L L L L L L L L L L L 
M M M M M M M M M M M M M 

This C++ pattern example prints the triangle of same alphabet in each single row using the do while loop.

#include<iostream>
using namespace std;

int main()
{
	int rows, i, j, k, alphabet = 65;
	
	cout << "Enter Triangle of Same Row Alphabets Rows = ";
	cin >> rows;

	cout << "Printing Triangle of Same Alphabets in each Row\n";

	i = 0;
	do
	{
		j = rows - 1;
		do
		{
			cout << " ";

		} while (j-- > i);

		k = 0;
		do
		{
			cout << char(alphabet + i) << " ";

		} while (++k <= i);

		cout << "\n";

	} while (++i <= rows - 1);
}

Enter Triangle of Same Row Alphabets Rows = 17
Printing Triangle of Same Alphabets in each Row
                 A 
                B B 
               C C C 
              D D D D 
             E E E E E 
            F F F F F F 
           G G G G G G G 
          H H H H H H H H 
         I I I I I I I I I 
        J J J J J J J J J J 
       K K K K K K K K K K K 
      L L L L L L L L L L L L 
     M M M M M M M M M M M M M 
    N N N N N N N N N N N N N N 
   O O O O O O O O O O O O O O O 
  P P P P P P P P P P P P P P P P 
 Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q