Need help with Math functions for text-based calculator!!!

Question

I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. Basically i got the easy part done. Also I am using the case to do the funtions but I am not sure if there are symbols on the keyboard that are commonly used for these funtions so i just made some up. I am new to java and this is only my second assignment so any help would be appreciated. Thanks
import java.util.*;
import java.math.*;
public class calculator
static Scanner console=new Scanner(System.in);
public static void main(String[]args)
double num1=0,num2=0;
double result=0;
char expression;
char operation;
String Soperation;
System.out.println("Enter ? for help or enter the operation in which to be processed");
Soperation=console.next();
operation = Soperation.charAt(0);
switch(operation)
case '+':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1+num2;
break;
case'-':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1-num2;
break;
case'*':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1*num2;
break;
case'/':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
if(num2==0)
System.out.println("Cannot Divide by Zero");
result=num1/num2;
break;
//square root
case'^':
System.out.println("Please enter a number");
break;
//fibonacci     
case'#':
System.out.println("Please enter the position of the Fibonacci number");
break;
//factorial
case'!':
System.out.println("Please enter the number for factoring");
break;
          //absolute value
case'&':
System.out.println("Please enter a number");
num1=console.nextInt();
result=num1;
break;
     // help funtion
case'?':
System.out.println("Type + for addition, - for subtraction");
System.out.println("* for multipliction, / for division,^ for the square root");
System.out.println(" & for absolute value, # for fibonacci,and ! for factorial");
break;
System.out.println("The result is:"+result);     
}

Answer 1

rmabrey wrote:
I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. java.lang.Math.sqrt()
nothing for factorial - write your own.
java.lang.Math.abs()
nothing for Fibonacci - write your own.
%