Lecture 24:- Numeric Hollow Half Pyramid

A numeric hollow half pyramid is a pattern where numbers are arranged in a half pyramid shape, and the interior is empty (hollow). Each row contains the numbers from 1 to the row number, and the rest of the elements in the row are empty spaces.

Here's an example of a numeric hollow half pyramid with 5 rows:

Copy code

1 2 3 4   5 6     7 8 9 10 11

Let's write a C++ program to generate the numeric hollow half pyramid based on the number of rows specified by the user:

cppCopy code

#include <iostream> int main() {    int rows;    std::cout << "Enter the number of rows: ";    std::cin >> rows;    int count = 1;    for (int i = 1; i <= rows; i++) {        // Print numbers in the row        for (int j = 1; j <= i; j++) {            std::cout << count;            count++;            if (j < i) {                std::cout << " ";            }        }        // Print spaces in the row        int spaces = (rows - i) * 2;        for (int k = 1; k <= spaces; k++) {            std::cout << " ";        }        std::cout << std::endl;    }    return 0; }

Example output for rows = 5:

Copy code

1 2 3 4   5 6     7 8 9 10 11

In the code above, we use two nested loops. The outer loop i controls the number of rows, and the inner loop j prints the numbers in each row along with spaces between them. The variable count keeps track of the current number to be printed in each row. The spaces in the row are determined by spaces = (rows - i) * 2, where (rows - i) represents the number of spaces before and after the numbers in the row.