Algorithm

Algorithm for C++ Program to Create a Pyramid:

1. Input: Accept the number of rows for the pyramid (rows).
2. Outer Loop: Run a loop from i = 1 to rows (inclusive).
a. Inner Loop (Spaces): Run a loop from j = 1 to rows - i (inclusive).
i. Print a space.
b. Inner Loop (Stars): Run a loop from k = 1 to 2 * i - 1 (inclusive).
i. Print an asterisk (*).
c. Move to the next line.
Algorithm for C++ Program to Create a Pattern:

1. Input: Accept the number of rows for the pattern (rows).
2. Outer Loop: Run a loop from i = 1 to rows (inclusive).
a. Inner Loop: Run a loop from j = 1 to i (inclusive).
i. Print the value of j followed by a space.
b. Move to the next line.

Code Examples

#1 Code Example- Programs to Print Triangles Using *, Numbers, and Characters

Code - C++ Programming

#include <iostream>
using namespace std;

int main() {

    int rows;

    cout << "Enter number of rows: ";
    cin >> rows;

    for(int i = 1; i <= rows; ++i) {
        for(int j = 1; j <= i; ++j) {
            cout << "* ";
        }
        cout << "\n";
    }
    return 0;
}
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Output

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cmd
*
* *
* * *
* * * *
* * * * *

#2 Code Example- Program to Print a Half-Pyramid Using Numbers

Code - C++ Programming

#include <iostream>
using namespace std;

int main() {

    int rows;

    cout << "Enter number of rows: ";
    cin >> rows;

    for(int i = 1; i <= rows; ++i) {
        for(int j = 1; j <= i; ++j) {
            cout << j << " ";
        }
        cout << "\n";
    }
    return 0;
}
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Output

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cmd
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

#3 Code Example- Program to Print Half-Pyramid Using Alphabets

Code - C++ Programming

#include <iostream7gt;
using namespace std;

int main() {

    char input, alphabet = 'A';

    cout << "Enter the uppercase character you want to print in the last row: ";
    cin >> input;

    // convert input character to uppercase
    input = toupper(input);

    for(int i = 1; i <= (input-'A'+1); ++i) {
        for(int j = 1; j <= i; ++j) {
            cout << alphabet << " ";
        }
        ++alphabet;

        cout << endl;
    }
    return 0;
}
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Output

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cmd
A
B B
C C C
D D D D
E E E E E

#4 Code Example-Programs to Print an Inverted Half-Pyramid Using * and Numbers

Code - C++ Programming

#include <iostream>
using namespace std;

int main() {

    int rows;

    cout << "Enter number of rows: ";
    cin >> rows;

    for(int i = rows; i >= 1; --i) {
        for(int j = 1; j <= i; ++j) {
            cout << "* ";
        }
        cout << endl;
    }
    
    return 0;
}
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Output

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* * * * *
* * * *
* * *
* *
*

#5 Inverted Half-Pyramid Using Numbers

Code - C++ Programming

#include <iostream>
using namespace std;

int main() {

    int rows;

    cout << "Enter number of rows: ";
    cin >> rows;

    for(int i = rows; i >= 1; --i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << j << " ";
        }
        cout << endl;
    }

    return 0;
}
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Output

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+
cmd
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

#6 Programs to Display Pyramids and Inverted Pyramids Using * and Digits

Code - C++ Programming

#include <iostream7gt;
using namespace std;

int main() {

    int space, rows;

    cout <<"Enter number of rows: ";
    cin >> rows;

    for(int i = 1, k = 0; i <= rows; ++i, k = 0) {
        for(space = 1; space <= rows-i; ++space) {
            cout <<"  ";
        }

        while(k != 2*i-1) {
            cout << "* ";
            ++k;
        }
        cout << endl;
    }    
    return 0;
}
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Output

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cmd
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
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Demonstration

C++ Programs Example To Create Pyramid and Pattern-DevsEnv