Factorial Program in Java Using Class

It is a factorial program in java using class and method.
Public class is fact_main where main method is defined. Another class Factorial where fact method is defined.

Aim: Write a java program to calculate factorial of a number using class concept

Java Program Code

import java.util.*;
class Factorial
{
 private int i=1; 
 public int fact(int n)
 { 
  while(n>0)
  {
   i=i*n; 
   n--;
  }
  return i;
 }
}

public class fact_main
{
 public static void main(String[] args)
 {
  Factorial fact1=new Factorial();
  Scanner object1= new Scanner(System.in);
  System.out.println("******** FACTORIAL PROGRAM ********");
  System.out.print("Enter number to find factorial: ");
  int num=object1.nextInt();
  int k=fact1.fact(num);
  System.out.println("Factorial of "+num+" is:  "+k);
 }
}

Output
Program name: fact_main.java

Generate Pascal Triangle in Java - Java Code for Pascal Triangle

It is a basic program to generate pascal triangle in Java language.

Pascal Triangle
It is a triangular array of the binomial coefficients in a triangle. Named Pascal comes from French mathematician, Blaise Pascal. In the program user input number. It generate rows for input number. In first row there is only the number 1. From all next rows, add the number directly above and to the left with the number directly above and to the right to find the new value.

Program Code

//Java Program to print Pascal Triangle
import java.util.*;
class Pascal 
{ 
 public static void main(String[] args) 
 { 
    System.out.print("Enter no of rows for pascal triangle: ");
    Scanner console=new Scanner(System.in);
    int num=console.nextInt();
    for (int i = 0; i < num; i++)
                  {
                        int c = 1;
 
                        for(int j = 0;j < num-i; j++)
                        {
                              System.out.print("   "); //blank space
                        }
 
                        for(int k = 0; k <= i; k++)
                        {
                              System.out.print("   ");
                              System.out.print(c); //print c value 
                              System.out.print(" ");
                              c = c * (i - k) / (k + 1);
                        }
    System.out.println();
                        System.out.println();
                  }
                  System.out.println();       
    }
}

Input/Output
Save Program at your system by name "Pascal.java".

Input
Enter value for number of rows you want in pascal triangle

Output

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