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Pascal’s triangle in Java using 2D Array
In this tutorial, we will discuss the Title of Pascal’s triangle in Java using 2D Array
In this post, we will learn how to write code to display the pascal triangle number pattern in Java language using 2 D array with for, while, and do-while loop
Java program to print pascal pattern using 2 D Array
Program to display pascal triangle Using for loop
Program 1
This program allows the user to enter the number of rows, and then the program will display the pascal triangle number pattern using for loop in the Java language
//Java program to show pascal's triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArr1{
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 rows=scan.nextInt();
//read the input from the user
int i=0,j=0,num=rows-1;
//declare and initiates variables
int arr[][]=new int[50][50];
//declare two D array
for(i=0; i<rows; i++){
arr[i][i]=arr[i][0]=1;
}
for(i=0; i<rows; i++){
for(j=1; j<i; j++){
arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
}
}
for(i=0; i<rows; i++){
for(j=0; j<num; j++){
System.out.print(" ");
}
for(j=0; j<=i; j++){
System.out.print(arr[i][j]+" ");
}
System.out.println();
num--;
}
}
}
When the above code is executed, it produces the following result
Program to display pascal triangle Using while loop
Program 1
This program allows the user to enter the number of rows, and then the program will display the pascal triangle number pattern using the while loop in the Java language
//Java programto print pascal triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArrWhile{
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 rows=scan.nextInt();
//read the input from the user
int i=0,j=0,num=rows-1;
//declare initialize variables
int arr[][]=new int[50][50];
//declare two Dim array
i=0;
while(i<rows){
arr[i][i]=arr[i][0]=1;
i++;
}
i=0;
while(i<rows){
j=1;
while(j<i){
arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
j++;
}
i++;
}
i=0;
while(i<rows){
j=0;
while(j<count){
System.out.print(" ");
j++;
}
j=0;
while(j<=i){
System.out.print(arr[i][j]+" ");
j++;
}
System.out.println();
num--;
i++;
}
}
}
When the above code is executed, it produces the following result
Program to display pascal triangle Using a do-while loop
Program 1
This program allows the user to enter the number of rows, and then the program will display the pascal triangle number pattern using do-while loop in the Java language
//Java programto print pascal triangle using 2D Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_2DArrDoWhile1{
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 rows=scan.nextInt();
//read the input from the user
int i=0,j=0,num=rows-1;
//declare and initialize variables
int arr[][]=new int[50][50];
//declare two D array
i=0;
do{
arr[i][i]=arr[i][0]=1;
i++;
}while(i<rows);
i=0;
do{
j=1;
while(j<i){
arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
j++;
}
i++;
}while(i<rows);
i=0;
do{
j=0;
while(j<num){
System.out.print(" ");
j++;
}
j=0;
do{
System.out.print(arr[i][j]+" ");
j++;
}while(j<=i);
System.out.println();
num--;
i++;
}while(i<rows);
}
}
When the above code is executed, it produces the following result
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