public class lab7
{ 

	public static void main(String[] args)
   	{ 
     		ConsoleReader console = new ConsoleReader(System.in);
 
     		System.out.print("\nInput a value for X: ");
     		double x = console.readDouble();
    
     		System.out.print("\nInput the value for N: ");
     		int n = console.readInt();
 
     		System.out.println("For X = "+ x + " and n = " + n);
     		double ex = calculate_ex(x,n);
     		System.out.println("The final calculated value for e^x is: "+ ex);
     		System.out.println("The True value for e^x is: "+ Math.pow(Math.E,x));

     	} // end main



	public static double calculate_ex(double x, int n)
	{
		double total = 0;
		double Factorial = 0;

		//debug//System.out.println("e^x = " + x + "^" + n);

		for(int i = 0; i<=n; i++)
		{
			Factorial = fact(i);
			total = total + (Math.pow(x,i)/Factorial);
			System.out.println("The estimated value for e^x when n = " + i + " is: " + total);
			//System.out.println("\tMath.pow("+x+","+i+")/"+Factorial + "\tTotal: " + total);
		}
		return total;
	}

	public static int fact(int k)
	{
		int factorial = 1;
		for(int j = 0; j<=k; j++)
		{
			if((j == 0)||(j == 1))
			{
				factorial = 1;
			}
			else
			{
				factorial = factorial * j;
			}
		}
		return factorial;
 
	}

} // end class