How to generate a hollow inverted half pyramid pattern in C++
In this shot, we will discuss how to make a hollow inverted half pyramid pattern using stars in C++.
Approach
We will use a nested loop and a while loop to generate this pattern. A nested loop refers to a loop that contains another loop.
Below is the visual of the hollow inverted half pyramid.
To generate a hollow inverted half pyramid pattern in C++, we use one for loop to print the * in the first line. Then, we use an outer for loop, where we use a decrement operator. We use the decrement operator to generate an inverted pattern to print * and a blank space.
In the while loop, we add a condition in our code so that our pyramid is hollow from the inside.
Code
#include <iostream>using namespace std;int main() {int number, i, j, h=0;cin >> number;for (i = 0; i < number; i++)cout << "* " ;for (i = number; i >= 1; --i){for (j = 0; j < number - i; ++j){while (h != (2 * i - 1)){if (h == 0 || h == 2 * i - 2)cout << "*" ;elsecout << " " ;h++;}}h = 0;cout << endl;}return 0;}
Enter the input below
Please enter a number in the input section above.
Explanation
-
In line 5, we initialize the variables
number,i,j, andh. -
In line 6, we take the input as
number. -
In line 8, we initialize a for loop, where we give a condition to run the loop
numbertimes to print*. This will print the*in the first line. -
In line 11, we initialize another outer for loop, where we give a condition to run the loop each time it is greater than or equal to 1.
-
In line 13, we initialize an inner for loop, where we give conditions to run the loop for
number - 1times, as we have already printed the first line in the above step. -
In line 14, we initialize a while loop, where we give conditions to print
*or -
In line 16, we give a condition to print
*and a blank space. The condition will print*at the edges of the pyramid and print a blank space inside the pyramid. -
In line 24, we print a next line character. This is done so that the star or blank space gets printed now from the next line onwards.
This way, we can make a hollow inverted half pyramid pattern using loops in C++.
This pattern can also be made using
numbers,alphabets, or any othercharacters.