first commit

SecondoProgetto/src/App.java

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+public class App {
+    public static void main(String[] args) throws Exception {
+        
+    }
+}
+class Poligono {
+    public int lati;
+    public double[] misure = new double[lati];
+    public double perimetro() {
+        int sum = 0;
+        for (int i = 0; i < lati; i++) {
+            sum += misure[i];
+        }
+        return sum;
+    }
+    public double semiperimetro() {
+        int sum = 0;
+        for (int i = 0; i < lati; i++) {
+            sum += misure[i];
+        }
+        return sum/2;
+    }
+}
+class Triangolo extends Poligono {
+    public double area() {
+        double a = misure[0];
+        double b = misure[1];
+        double c = misure[2];
+        double p = Poligono.semiperimetro();
+        double result = p*(p-a)*(p-b)*(p-c);
+        return Math.sqrt(result);
+    }
+}
+class Rettangolo extends Poligono {
+    private double latolungo() {
+
+    }
+    public double area(double latolungo, double latocorto) {
+        return latolungo*latocorto;
+    }
+}
+class Quadrato extends Poligono {
+    public double area(double lato) {
+        return lato*lato;
+    }
+}
+class Pentagono extends Poligono {
+    public double area(double lato) {
+        double constarea = 1.72;
+        return lato*lato*constarea;
+    }
+}