1.
Introduction
2.
Problem Statement
3.
Solution
3.1.
Program in C
3.2.
Program in C++
3.3.
Program in Java
3.4.
Program in Python
4.
4.1.
What is Pattern Printing Program?
4.2.
How do you solve a pattern?
5.
Conclusion
Last Updated: Mar 27, 2024
Medium

# Diamond Number Pattern

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## Introduction

As the name implies, a pattern is a repeated sequence that consistently repeats itself. A pattern is a general solution that may be used repeatedly to a recurring problem.

To answer any random pattern question, it is necessary to comprehend the fundamentals and acquire the techniques. It may look mysterious and complex at first, but patterns are not that complicated since it gives a straightforward technique to recognize and code to produce a suitable and systematically created pattern.

## Problem Statement

Write a program to produce a diamond shape with 2n rows given the integer n.

Examples

First Sample Input: 5

First Sample Output:

``````     1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
6 6 6 6 6 6
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1``````

Second Sample Input: 4

Second Sample Output:

``````
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1``````
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## Solution

### Program in C

``````#include<stdio.h>
#include<math.h>
int main()
{
int output,input,a,c=1;
printf("Enter the size of the row:");
int rowSize;
scanf("%d",&rowSize);
for(output=rowSize;output>=-rowSize;output--)
{
for(input=1;input<=abs(output);input++)
{
printf(" ");
}
for(a=rowSize;a>=abs(output);a--)
{
printf("%d ",c);
}
if(output>0)
c++;
else
c--;
printf("\n");
}}``````

Input/Output:

``````Enter the size of the row:3
1
2 2
3 3 3
4 4 4 4
3 3 3
2 2
1``````

### Program in C++

``````#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int output,input,a,c=1;
cout<<"Enter the size of the row:";
int rowSize;
cin>>rowSize;
for(output=rowSize;output>=-rowSize;output--)
{
for(input=1;input<=abs(output);input++)
{
cout<<" ";
}
for(a=rowSize;a>=abs(output);a--)
{
cout<<c<<" ";
}
if(output>0)
c++;
else
c--;
cout<<"\n";
}}``````

Input/Output

``````Enter the size of the row:4
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1``````

### Program in Java

``````import java.util.Scanner;
public class DiamondNumPattern {

public static void main(String[] args) {
Scanner cs=new Scanner(System.in);
int output,input,a,c=1;
System.out.println("Enter the size of the row:");
int rowSize=cs.nextInt();
for(output=rowSize;output>=-rowSize;output--)
{
for(input=1;input<=Math.abs(output);input++)
{
System.out.printf(" ");
}
for(a=rowSize;a>=Math.abs(output);a--)
{
System.out.print(c+" ");
}
if(output>0)
c++;
else
c--;
System.out.println();
}
cs.close();
}
}``````

Input/Output

``````Enter the size of the row:
5
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
6 6 6 6 6 6
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1``````

### Program in Python

``````rowSize=int(input("Enter the size of the row:"))
c=1
for output in range(rowSize,-(rowSize+1),-1):
for inn in range(1,abs(output)+1):
print(" ",end="")
for a in range(rowSize,abs(output)-1,-1):
print(c,end=" ")
if output > 0:
c +=1
else:
c -=1
print("\r")``````

Input/Output

``````Enter the size of the row:2
1
2 2
3 3 3
2 2
1``````

### What is Pattern Printing Program?

Pattern programs are patterns/designs/symbols made out of numbers, alphabets, or symbols in a specific order. Looping structures are used to solve these patterns.

### How do you solve a pattern?

Step 1: Set up a table. The first step in looking for a pattern is to create a table that shows the existing relationships.
Step 2: Determine the Relationship Between Numbers.
Step 3: Draw some conclusions.

Also Read - Strong number in c

## Conclusion

In this article, we have learned to design a diamond number pattern in C, C++, Java, and Python.

We hope that this blog has helped you enhance your knowledge of pattern problems in various programming languages.