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class Complex {
private final double x, y;
Complex(double x, double y) {
this.x = x;
this.y = y;
}
double getX() {
return x;
}
double getY() {
return y;
}
}
class Use {
void test(Complex c) {
System.out.println(Math.hypot(c.getX(), c.getY()));
}
}