C++ Program to Print Full Diamond Shape Pyramid

Creating a full diamond shape pyramid using characters in C++ involves using nested loops to print spaces and characters in a specific format. This pattern is visually appealing and commonly used to practice loop constructs. The diamond pattern consists of two parts: an upper pyramid and an inverted lower pyramid.

Example: Full Diamond Shape Pyramid Using Stars (*)

This program will print a diamond shape pyramid made of stars (*). The user will input the number of rows for the upper pyramid. The lower pyramid will automatically be one row less than the upper to complete the diamond shape.

C++ Code:

#include <iostream>

using namespace std;

int main() {

    int rows;

    // User inputs the number of rows for the upper part of the diamond

    cout << “Enter the number of rows: “;

    cin >> rows;

    // Print the upper part of the diamond

    for (int i = 1; i <= rows; ++i) {

        // Print leading spaces

        for (int j = rows – i; j > 0; –j) {

            cout << ” “;

        }

        // Print stars

        for (int j = 1; j <= 2 * i – 1; ++j) {

            cout << “*”;

        }

        cout << endl;

    }

    // Print the lower part of the diamond

    for (int i = rows – 1; i > 0; –i) {

        // Print leading spaces

        for (int j = 0; j < rows – i; ++j) {

            cout << ” “;

        }

        // Print stars

        for (int j = 1; j <= 2 * i – 1; ++j) {

            cout << “*”;

        }

        cout << endl;

    }

    return 0;

}

Explanation:

1. Header and Namespace:

The program includes the <iostream> header for input and output operations and uses the std namespace.

2. Input:

The user is prompted to enter the number of rows for the upper half of the diamond.

3. Upper Diamond:

   • Outer Loop: Controls the rows of the upper pyramid.
   • First Inner Loop: Manages the spaces before the stars begin on each row. The spaces decrease as the row number increases.
   • Second Inner Loop: Manages the printing of stars. The number of stars on each row is 2 * i – 1, forming the pyramid shape.

4. Lower Diamond:

   • Outer Loop: Controls the rows of the lower inverted pyramid.
   • First Inner Loop: Similar to the upper half but in reverse order for spaces.
   • Second Inner Loop: Handles the printing of stars, decreasing the count as the rows decrease to form the inverted pyramid.

Program Output:

If the user inputs 4 for the number of rows, the output will be:

*

***

*****

*******

*****

***

*