How to generate a solid diamond pattern with stars in C++

This shot discusses how to make a diamond pattern in C++ with stars or * (asterisks).

Method

We will use the nested looploops within a loop method to generate this pattern.

Let’s look at the below image to understand this better.

#include <iostream>
using namespace std;
int main() {
  
  int number, space = 1;
  cin >> number;
  space = number - 1;
  
  for (int i = 1; i <= number; i++) {
    for (int j = 1; j <= space; j++)
    cout << " " ;
    space--;
    for (int j = 1; j <= 2*i-1; j++)
    cout << "*" ;
    cout << endl;
  }
  space = 1;
  for (int i = 1; i <= number-1; i++) {
    for (int j = 1; j <= space; j++)
    cout << " ";
    space++;
    
    for (int j = 1; j <= 2*(number-i)-1; j++)
    cout << "*";
    cout << endl;
  }
  
  return 0;
}

Enter the input below

Code input area

Explanation

In line 6, we initialize the number and space variables.
In line 7, we use cin >> to take the input as number.
From lines 11 to 19, we initialize nested for loops that use * to build the upper half of the diamond, i.e., the solid full pyramid.
From lines 22 to 30, we initialize a second nested for loop that uses * to generate the lower half of the diamond, i.e., the inverted solid full pyramid.

In this way, we have learned to generate a diamond pattern with stars * in C++.

We can also use numbers, alphabets, or any other characters to generate this pattern.