Diamond Pattern in C, C++, Java & Python – Code with Explanation & Examples in Short and Simple

   

C Program

#include <stdio.h>
int main(){
    int n=4;
    for(int i=1;i<=n;i++){
        for(int j=i;j<n;j++) printf(" ");
        for(int j=1;j<=2*i-1;j++) printf("*");
        printf("\n");
    }
    for(int i=n-1;i>=1;i--){
        for(int j=i;j<n;j++) printf(" ");
        for(int j=1;j<=2*i-1;j++) printf("*");
        printf("\n");
    }
}

C Output

Input:  
n = 4 

Output:  
   *
  ***
 *****
*******
 *****
  ***
   *

C++ Program

#include <iostream>
using namespace std;
int main(){
    int n=3;
    for(int i=1;i<=n;i++){
        cout<<string(n-i,' ')<<string(2*i-1,'*')<<"\n";
    }
    for(int i=n-1;i>=1;i--){
        cout<<string(n-i,' ')<<string(2*i-1,'*')<<"\n";
    }
}

C++ Output

Input:  
n = 3

Output:  
  *
 ***
*****
 ***
  *

JAVA Program

public class Main{
    public static void main(String[] args){
        int n=5;
        for(int i=1;i<=n;i++){
            System.out.println(" ".repeat(n-i)+"*".repeat(2*i-1));
        }
        for(int i=n-1;i>=1;i--){
            System.out.println(" ".repeat(n-i)+"*".repeat(2*i-1));
        }
    }
}

JAVA Output

Input:  
n = 5 

Output:  
    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

Python Program

n=2
for i in range(1,n+1):
    print(" "*(n-i)+"*"*(2*i-1))
for i in range(n-1,0,-1):
    print(" "*(n-i)+"*"*(2*i-1))

Python Output

Input:  
n = 2  

Output:  
 *
***
 *

Deep-Dive Explanation

Recognizing the Diamond Pattern

The diamond pattern is made up of two pyramids: one upright pyramid at the top and one inverted pyramid at the bottom. The number of stars rises till middle and decreases symmetrically.

Step-by-Step Logic

We divide it into two parts. First, the top half:

Loop from i = 1 to n for rows.

Print (n-i) spaces for alignment.

Print (2*i - 1) stars to create the width.

Go to the next line.

And then the bottom half:

Loop from i = n-1 to 1.

Use the same space and star printing logic.

Example for n = 4

Upper half:

Row 1 → 3 spaces + 1 star

Row 2 → 2 spaces + 3 stars

Row 3 → 1 space + 5 stars

Row 4 → 0 spaces + 7 stars

Lower half: Reverse the upper half without the middle row.

Why This Pattern Matters

Mastering this pattern reinforces knowledge of nested loops, repeating strings, and symmetry in reasoning. It's widespread in coding interview questions to assess nested loop expertise.

Real-Life Analogy

Imagine a diamond kite — it's constructed with immaculate symmetry starting from the middle line, identical to this pattern.

Practical Uses

Console application text-based artwork

Terminal UI loading animations

Center printing logic within formatted outputs

Interview Insights

Hollow diamonds, number diamonds, or alphabet diamonds are some of the variations. If you can code one, it is easy to switch to the rest by modifying the print logic.

For SEO purposes:

The diamond pattern C program, C++ diamond pattern program, Java diamond pattern program, and Python diamond pattern program are the most popular initial programming puzzles. They learn us the usage of nested loops, management of space, and center positioning logic. If you are preparing for coding interviews, wanting to practice console-based pattern programs, or studying fundamental loop concepts, knowing the diamond pattern will make your problem-solving ability stronger.