In this tutorial, we will discuss the concept of the Java code to generate a pascal triangle using arrays with user input
In this topic, we are going to learn how to write a program to print Pascal triangle patterns using numbers using user input in the Java programming language
Here, we use for, while, and do-while loops for printing pascal triangle
In this program, the user is asked to enter the number of rows and then it will show a pascal triangle number pattern using for loop in the Java language
Program 1
//Java programto print pascal triangle using Array
import java.util.Scanner;
//class diclaration
class Disp_Pascal_Triangle_Arr1{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the row for pascal triangle: ");
//Ask input from the user for row
int row=scan.nextInt();//read the input from the user
int i,j,temp=1,counter=0;//declare variables
int[] array=new int[row];//declare one D array
int[] arrayTemp=new int[row];//declare temp one D array
array[0]=1;
array[1]=1;
for(i=0; i<row; i++)//outer for loop
{
for(j=(row-1); j>i; j--)//inner for loop
System.out.print(" ");//print initial space
for(j=0; j<=i; j++)//inner for loop
{
if(i==0)
System.out.print("1");
else
{ if(j==0|| j==i)
System.out.print("1 ");
else{
arrayTemp[temp]=array[counter]+array[counter+1];
System.out.print(arrayTemp[temp]+" ");
//print elemenys
temp++;
counter++;
}
}
}
System.out.println();//mpve to next line
arrayTemp[temp]=1;
if(i>1)
{
counter=0;
array[counter]=1;
for(temp=1,counter=1; counter<=i; temp++, counter++)
array[counter]=arrayTemp[temp];
temp=1;
counter=0;
}
}
}
} When the above code is executed, it produces the following result
In this program, the user is asked to enter the number of rows and then it will show a pascal triangle number pattern using the while loop in the Java language
Program 2
//Java programto print pascal triangle using Array
import java.util.Scanner;
//class diclaration
class Disp_PascalTriangleArraywhile{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the row for pascal triangle: ");
//Ask input from the user for row
int rows=scan.nextInt();//read the input from the user
int row=5,i,j,temp=1,count=0;
int[] array=new int[rows];//declare single dim array
int[] arrayTemp=new int[rows];//declare single dim temp array
array[0]=1;
array[1]=1;
i=0;
while(i<rows)
{
j=(rows-1);
while( j>i){
System.out.print(" ");//print initial space
j--;
}
j=0;
while(j<=i)
{
if(i==0)
System.out.print("1");
else
{ if(j==0|| j==i)
System.out.print("1 ");
else{
arrayTemp[temp]=array[count]+array[count+1];
System.out.print(arrayTemp[temp]+" ");
temp++;
count++;
}
}
j++;
}
System.out.println();
arrayTemp[temp]=1;
if(i>1)
{
count=0;
array[count]=1;
for(temp=1,count=1; count<=i; temp++, count++)
array[count]=arrayTemp[temp];
temp=1;
count=0;
}
i++;
}
}
} When the above code is executed, it produces the following result
In this program, the user is asked to enter the number of rows and then it will show a pascal triangle number pattern using the do-while loop in the Java language
Program 3
//Java programto print pascal triangle using Array
import java.util.Scanner;
//class diclaration
class Disp_Pas_Tri_Arr_Dowhile_UserInput{
public static void main (String args[]){//main method
Scanner scan=new Scanner(System.in);
//Scanner object for user input
System.out.print("Enter the row for print triangle: ");
//Ask input from the user for row
int No_Of_rows=scan.nextInt();//read the input from the user
int i,j,temp=1,count=0;//integer variable declaration
int[] arr=new int[No_Of_rows];
//declare single dim array
int[] arrTemp=new int[No_Of_rows];
arr[0]=1;
arr[1]=1;
//initialize array elements
i=0;
do{//outer do-while loop
j=(No_Of_rows-1);
do{//inner do-while loop
System.out.print(" ");//print initial space
j--;
}while(j>=i);
j=0;
do{//inner do-while loop
if(i==0)
System.out.print("1");
else
{ if(j==0|| j==i)
System.out.print("1 ");
else{
arrTemp[temp]=arr[count]+arr[count+1];
System.out.print(arrTemp[temp]+" ");
temp++;
count++;
}
}
j++;
}while(j<=i);
System.out.println();
arrTemp[temp]=1;
if(i>1)
{
count=0;
arr[count]=1;
for(temp=1,count=1; count<=i; temp++, count++)
arr[count]=arrTemp[temp];
temp=1;
count=0;
}
i++;
}while(i<No_Of_rows);
}
} When the above code is executed, it produces the following result
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