[39852063wang]

I have wrote a program that solves some mathematical calculations, but I need the program to keep restart itself every-time after the calculation is over.

import java.util.Scanner;

class EvenOrOdd{
	public static void main(String[] args){
		
		System.out.println("     Enter parabolic equation in standard form");
		System.out.println("     ax^2+bx+c");
		Scanner henry = new Scanner(System.in);
		double a,b,c,xintercept1,delta,xintercept2,ml,mv,m;
		
		System.out.println("     Enter a - value: ");
		a = henry.nextDouble();
		System.out.println("	 Enter b - value: ");
		b = henry.nextDouble();
		System.out.println("	 Enter c - value: ");
		c = henry.nextDouble();
		
		delta = Math.sqrt(b * b - 4 * a * c);
		xintercept1 = (-b+delta)/(2*a);
		xintercept2 = (-b-delta)/(2*a);
		System.out.println("	x-intercepts of the line ");
		System.out.println("");
		System.out.println("				[("+a+")x^2+("+b+")x+("+c+")]");
		System.out.println("");
		System.out.println("	are "+xintercept1+" and "+xintercept2);
		ml = -b/(2*a);
		mv = (4*a*c-b*B)/>/>/(4*a);
		m = 2*a;
		if (a>0){
			System.out.println("	The minimum value is located on");
	    }else if (a<0){
		System.out.println("	The maximum value is located on");
        }
		System.out.println("	("+ml+","+mv+")");
		System.out.println("	The dervative of the function is ");
		System.out.println("	[("+m+")x+("+b+")]");

	}
	}

I don't know how to make the code repeat itself after I have read all the results.
And I need a place where java can tell if I still want the program to be continuous or not.
such as
System.out.println("Do you want to do another calculation? Y/N")
Y -------- Rerun the code(!!THE CODE ONLY, NOT THE WHOLE PROGRAM!!)
N -------- Terminate the program entirely.

Still new to JAVA, need extra help on coding still.
(Pretty easy code as many of you can tell XD)

This post has been edited by no2pencil: 17 January 2016 - 09:16 PM
Reason for edit:: Added code tags

[jon.kiparsky]

What you want here is a while loop. While (continue) { do the stuff, then ask if continue}.

[macosxnerd101]

You might want to look into the notion of a loop:

boolean playAgain = true;

//the loop executes while the boolean
//expression in the parentheses evaluates to true
//in this case, while playAgain == true
while(playAgain){
    //your code

    System.out.println("Do you want to play again?");
    String input = scanner.nextLine();

    //if the user types "Yes", then we mark playAgain = true
    //so the loop will execute again.
    //otherwise, playAgain is set to false and the loop
    //does not run again
    playAgain = (input.equalsIgnoreCase("Yes"));
  
}

Locke has a good tutorial on looping and NeoTifa's Basic Java for N00blets is another good resource.

[ndc85430]

Please also use meaningful names for variables, classes, methods, etc. - names like henry (line 8) are not good because they don't give any information about what the thing they're naming is for. Good names help you read and understand code and are therefore extremely important.

This post has been edited by ndc85430: 18 January 2016 - 01:22 AM

[39852063wang]

ndc85430, on 18 January 2016 - 01:06 AM, said:

Please also use meaningful names for variables, classes, methods, etc. - names like henry (line 8) are not good because they don't give any information about what the thing they're naming is for. Good names help you read and understand code and are therefore extremely important.

Thank you for the advice. SWEAR going to fix the problem in the future programming...

[g00se]

Quote

SWEAR going to fix the problem in the future programming...

Fix it in THIS program!