# need some help

• 05-23-2013, 08:28 PM
Phillip
need some help
hello everyone,

I just started to do java and I'm suppose to solve an quadratic equation ax^2+bx+c=0.

So everything works good, and im trying to put some restrictions on the equation like if a=0 do this , if square root=0 do this if both do this.

the restriction works, the only problem is that every time I run the program both message shows off. What should I do?

Code:

```System.out.println("Finding the solution to ax^2+bx+c=0");       System.out.println("Write a value for a");       double a = input.nextDouble();           System.out.println("Write a value for b");       double b = input.nextDouble();       System.out.println("Write a value for c");       double c = input.nextDouble();       double square = (Math.sqrt(b*b-4*a*c));       double x1 = (-b+square)/(2*a);       double x2 = (-b-square)/(2*a);       double xx1 = (-b+square);       double xx2 = (-b-square);                             if (square > 0)       {         System.out.println("x1= " +x1+ "  and x2= "+x2);       }               else       {       System.out.println("Square root is 0 making x1 and x2 =" +-b/2*a);       }             if (a>0)       {         System.out.println("x1 = "+x1+ "  and x2 = "+x2);       }       else {         System.out.println("x1 = "+xx1+ "  and x2 = "+xx2);   }                       } }```
Thanks
• 05-23-2013, 08:40 PM
JosAH
Re: need some help
If 'square' isn't larger than zero it isn't necessarily equal to zero ... the same counts for 'a'.

kind regards,

Jos

ps. and be careful if you take the square root of a negative number.