static/ dynamic help

**shaishai** · 10-16-2005, 07:23 PM

Code:

public class getHypo
{
	
	private double a;
	private double b;
	private double c = Math.sqrt(Math.pow(a,2) + Math.pow(b,2));
	
	
	double getC()
	{
		return c;
	}
	
	
}






public class pythagorian
{
	
	public static void main(String[] args)
	{
		double a, b, c;
		ConsoleIO console = new ConsoleIO();
		getHypo **** = new getHypo();
		
		System.out.print("a = ");
		a = console.readDouble();
		System.out.print("\nb = ");
		b = console.readDouble();
		
		System.out.print("\nc = ");
		c = ****.getC();
		System.out.println(c);	
	}	
}

when i execute it, and input a = 3 b = 4 c should = 5, but it equals 0.0......what do i do/ what did i do wrong?

**sjalle** · 10-16-2005, 08:01 PM

With less code than this getHypo is reduced to a mere wrapper

Code:

public class getHypo {
  /*
  private double a;
  private double b; 
   the c you declare here is local to the getHypo class, the a and
   b values are also local (and 0).
  private double c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
  */

  double getC(double a, double b) {
    return Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
  }

}

public class pythagorian {

  public static void main(String[] args) {
    double a, b, c;
    ConsoleIO console = new ConsoleIO();
    getHypo **** = new getHypo();

    System.out.print("a = ");
    a = console.readDouble();
    System.out.print("\nb = ");
    b = console.readDouble();

    System.out.print("\nc = ");
    c = ****.getC();
    System.out.println(c);
  }
}