import java.util.*;
import java.lang.*;
import java.io.*;
// Lambda 101: Functional interface
/**
* Esta eh uma interface funcional, pois possui apenas um metodo abstrato.
*/
interface Bhaskara {
public double delta(double a, double b, double c);
}
class Main {
public static void main(String[] args) {
// 2x2 + 8x - 24 = 0
Bhaskara bas = (a,b,c) -> Math.pow(b,2)-4*a*c;
System.out.println(bas.delta(2.0,8.0,-24.0));
}
}
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