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#1
DeepIndian

DeepIndian

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I need to remove math.pow and factorial and put something that will still calculate and get me same results.

package myexp;

import java.util.Scanner;

public class Main {

	public static void main(String args[]) {
	  double x, n, sum = 1;
	  int i;

	  Scanner read = new Scanner(System.in);

	  System.out.println("Enter the value of x: ");
	  x = read.nextDouble();

	  System.out.println("Enter the value of n: ");
	  n = read.nextDouble();
	  System.out.println ();

	  for(i = 1; i <= n; i++) {
		  sum += myexp(x,i);
	  }
	  System.out.println (sum);
 }

	  public static double myexp( double x, int i) {

	  if (i == 1)
	  return x;
	  else
	   return Math.pow (x, i)/ factorial (i);
	  }

	  public static double factorial(double x, int n) {

	  double factorial = 1.0;	
	  int i = 1;
	  while (i <= n) {
		  factorial = factorial * i;
		  i = i + 1;
	  }
	  return factorial;
	  }
}

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#2
W-Unit

W-Unit

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Why does your factorial function accept two parameters? Factorials are a unary (one-parameter) operation. That is, you take "5 factorial" or "10 factorial" - not "5 factorial 2." The latter phrase makes no sense.

Anyways, the following code should work for all factorials, and all integer exponents greater than zero. You may want to edit the code for myexp so that it throws an exception if you try to evaluate a negative exponent; currently it will just loop infinitely in this case.
public static double factorial(int x)
{
	if (x == 0) return 1;
	else if (x < 0) { return -1; } // Throw some exception- cannot take factorial of a negative number
	else return x * factorial(x - 1);
}

public static double myexp(double x, int n)
{
	double result = x;
	for (; n > 1; n--)
	{
		result *= x;
	}
	return result;
}

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