import java.util.Scanner;

/**
 * Trig class to perform trig function for our Graphing Calculator
 * (sin, cos, tan, inverses, degree to radian)
 * Lauren Green
 * 10/19/18
 */
public class Trig
{
    int input = 0;
    double answer;
    
    public Trig()
    {
        boolean validInput = false;
        
        while(!validInput) {
        //Get input of type of function
        Scanner in1 = new Scanner(System.in);
        System.out.println("Which trignometric function would you like to run? \n sin, cos, tan, arcsin, arccos, arctan");
        String operation = in1.nextLine(); 
        operation = operation.toLowerCase();
        
        //Get input of number
        Scanner in2 = new Scanner(System.in);
        System.out.println("What number would you like to find the " + operation + " of?");
        int input = in2.nextInt();
        
        //Do the math depending on the input.
        if (operation.equals("sin")) {
            answer = Math.sin(input);
            System.out.println(answer);
            validInput = true;
            
        } else if (operation.equals("cos")) {
            answer = Math.cos(input);
            System.out.println(answer);
            validInput = true;
            
        } else if (operation.equals("tan")) {
            answer = Math.tan(input);
            System.out.println(answer);
            validInput = true;
            
        } else if (operation.equals("arcsin")) {
            answer = Math.asin(input);
            System.out.println(answer);
            validInput = true;
            
        } else if (operation.equals("arccos")) {
            answer = Math.acos(input);
            System.out.println(answer);
            validInput = true;
            
        } else if (operation.equals("arctan")) {
            answer = Math.atan(input);
            System.out.println(answer);
            validInput = true;
            
        } else {
            System.out.println("Error, try again \n");
            
    }
}
        //Ask if they would like to convert.
        System.out.println("Would you like to convert your answer from radian to degrees?  Y or N");
        Scanner in3 = new Scanner(System.in);
        String response = in3.nextLine();
        response = response.toLowerCase();
        if (response.equals("y")) {
            toDegrees(answer);
    } else {
        System.out.println("Have a nice day!");
        //Insert Return to Main Menu
}
    }

    public void toDegrees(double answer) 
    {
        double conversion = Math.toDegrees(answer);
        System.out.println(conversion);
        //Insert Return to Main Menu
    }
}