Java program to print pascal triangle

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Java program to print pascal triangle

In this tutorial, we will discuss the Java program to print pascal triangle

In this post, we will learn how to display pascal triangle in java language using for, while and do-while loop

Pascal triangle

Code to print pascal triangle

Program to print pascal triangle Using for loop

Program 1

This program allows the user to enter the number of rows and it will display pascal triangle number pattern using for loop in Java language

//Java programto print pascal pyramid number pattern
import java.util.Scanner;
class PascalTriangle{
public static void main (String args[]){
//create object for scanner
Scanner scan=new Scanner(System.in);
//Enter number ofrows for pascal triangle
System.out.print("Enter the row for pascal triangle: ");
int rows=scan.nextInt();
int count=1;//variable count initialize as 1
for(int i=0; i<rows; i++){
   for(int j=rows; j>i; j--){//inner for loop
   System.out.print(" ");
//first inner loop print space
   }
   count=1;
   for(int k=0; k<=i; k++){
   System.out.print(count+" ");
     count=count*(i-k)/(k+1);
//second inner loop prints number according to the given equation
  
   }
   System.out.println();

}
}
}

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

Output

Program to print Pascal triangle Using while loop

Program 2

This program allows the user to enter the number of rows and it will be displayed pascal triangle number pattern using while loop in Java language.

//Java programto print pascal pyramid number pattern
import java.util.Scanner;
class PascalTrianglewhile{
public static void main (String args[]){
Scanner scan=new Scanner(System.in);
//create object for scanner
System.out.print("Enter the row for pascal triangle: ");
//Enter number ofrows for pascal triangle
int rows=scan.nextInt();
int count=1;
int i=0;
while( i<rows){
int j=rows;
   while(j>i){
   System.out.print(" ");  //first inner loop print space
    j--;
   }
   count=1;
   int k=0;
   while(k<=i){
   System.out.print(count+" ");
     count=count*(i-k)/(k+1);
//second inner loop prints number according to the given equation
   k++;
   }
   System.out.println();
i++;
}
}
}

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

Pascal triangle pattern

Program to print pascal triangle Using do-while loop

Program 3

This program allows the user to enter the number of rows and it will be displayed pascal triangle number pattern using the do-while loop in Java language.

//Java programto print pascal pyramid number pattern
import java.util.Scanner;
class PascalTriangleDowhile{
public static void main (String args[]){
Scanner scan=new Scanner(System.in);
//create object for scanner
System.out.print("Enter the row for pascal triangle: ");
//Enter number ofrows for pascal triangle
int rows=scan.nextInt();
int count=1;
int i=0;
do{
int j=rows;
   do{
   System.out.print(" ");  //first inner loop print space
    j--;
   }while(j>i);
   count=1;
   int k=0;
  do{
   System.out.print(count+" ");
     count=count*(i-k)/(k+1);
//second inner loop prints number according to the given equation
   k++;
   } while(k<=i);
   System.out.println();
i++;
}while( i<rows);
}
}

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

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