Factorial program in java

Answer 1

If you're talking about factorial as in "4! = 4 * 3 * 2 * 1 = 24" then you could make a function something like this:

public int fact(int Num) {

int fact;

for (int i = Num; i > 1; i--) {

fact = i * (i - 1)

}

Return fact;

}

Answer 2

fibonacci:

import java.io.*;

class FibonacciSeries

{

public static void main(String args[])throws IOException

{

BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter the limit");

int a=Integer.parseInt(in.readLine()),b=0,c=1,d,e;

System.out.print(b+" "+c+" ");

for(d=1;d<=a;d++)

{

e=b+c;

System.out.print(e+" ");

b=c; c=e;

}

}

}

factorial:

import java.io.*;

class Factoial

{

public static int fac(int x)

{

int a,b=x;

for(a=2;a<b;a++)

{

x*=a;

}

return x;

}

public static void main(String args[])throws IOException

{

BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter the number");

int a=Integer.parseInt(in.readLine());

System.out.println("Factorial of "+a+" is= "+fac(a));

}

}

Answer 3

// returns n!

public static long factorial(long n) {

// base case

if(n <= 1) {

return 1;

}

// recursion

return n * factorial(n-1);

}

Answer 4

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