Program to Generate Pascal’s triangle using 2 D array in Java

Program to Generate Pascal’s triangle using 2 D array in Java

In this tutorial, we will discuss the concept of the Program to Generate Pascal’s triangle pattern using 2 D array in Java

In this topic, we are going to learn how  to write a program to print Pascal triangle number patterns using a two dimension Array in the Java  programming language

Here, we  use for, while, and do-while loops for printing pascal triangle

Display the pascal triangle in Java using loops

Java Code to display pascal triangle using for loop

In this program, the user declares and initializes integer variables, it will display a pascal triangle number pattern using for loop in the Java language according to the rows

Program 1

//Java programto print pascal triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArr{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the Number of rows: ");
//Ask input from the user for row
int row=scan.nextInt();//read the input from the user
int i=0,j=0,count=row-1;//declare variables
int arr[][]=new int[50][50];//declare two D array
for(i=0; i<row; i++){
arr[i][i]=arr[i][0]=1;
  }
    for(i=0; i<row; i++){
            for(j=1; j<i; j++){
             arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
}
}
            
    for(i=0; i<row; i++){
            for(j=0; j<count; j++){
            System.out.print(" ");
}
for(j=0; j<=i; j++){
            System.out.print(arr[i][j]+" ");
}
System.out.println();
count--;
}
    }
}

When the above code is executed, it produces the following result

Java Code to display pascal triangle using while loop

In this program, the user declares and initializes integer variables, it will display a pascal triangle number pattern using the while loop in the Java  language according to the rows

Program 2

//Java programto print pascal triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArrWhil{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the Number of rows: ");
//Ask input from the user for row
int row=scan.nextInt();//read the input from the user
int i=0,j=0,count=row-1;//declare variables
int arr[][]=new int[50][50];//declare two D array
i=0;
while(i<row){
arr[i][i]=arr[i][0]=1;
 i++;
  }
  i=0; 
   while(i<row){
       j=1;
            while(j<i){
             arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
              j++;
}
 i++;
}
      i=0;       
    while(i<row){
        j=0; 
            while(j<count){
            System.out.print(" ");
             j++;
}
j=0;
while(j<=i){
            System.out.print(arr[i][j]+" ");
            j++;
}
System.out.println();
count--;
 i++;
}
    }
}

When the above code is executed, it produces the following result

Java Code to display pascal triangle using do-while loop

In this program, the user declares and initializes integer variables, it will display a pascal triangle number pattern using the do-while loop in the Java language according to the rows

Program 3

//Java programto print pascal triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArrDoWhile{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the Number of rows: ");
//Ask input from the user for row
int row=scan.nextInt();//read the input from the user
int i=0,j=0,count=row-1;//declare variables
int arr[][]=new int[50][50];//declare two D array
i=0;
do{
arr[i][i]=arr[i][0]=1;
 i++;
  }while(i<row);
  i=0; 
   do{
       j=1;
            while(j<i){
             arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
              j++;
}
 i++;
}while(i<row);
      i=0;       
    do{
        j=0; 
            while(j<count){
            System.out.print(" ");
             j++;
}
j=0;
do{
            System.out.print(arr[i][j]+" ");
            j++;
}while(j<=i);
System.out.println();
count--;
 i++;
}while(i<row);
    }
}

When the above code is executed, it produces the following result

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