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public text v1 · immutablepublic static void testValue() {
Parabola p = new Parabola (1, -4, 3);
double y = p.value(1.0);
assert y == 0.0;
y = p.value(2.0);
assert y == -1.0;
y = p.value (7.0);
assert y == 24.0;
y = p.value (-2.5);
assert y == 19.25;
System.out.println("value OK.");
}