upload work 2022-03-11

20200311.cpp

@@ -0,0 +1,79 @@
+#include "iostream"
+
+using namespace std;
+
+class Circle {
+public:
+    Circle(int r);
+    Circle();
+
+    const double PI = 3.1415926;
+
+    double getLength();
+
+    double getArea();
+
+    double getRadius();
+private:
+
+    double radius = 0;
+};
+
+double Circle::getLength() {
+    return radius * 2 * PI;
+}
+
+double Circle::getArea() {
+    return radius * radius * PI;
+}
+
+double Circle::getRadius() {
+    return radius;
+}
+
+Circle::Circle(int r) : radius(r) {}
+Circle::Circle() : radius(0) {}
+
+int main() {
+    Circle circle(17);
+    cout << "Area | Length | Radius" << endl;
+    cout << circle.getArea() << endl << circle.getLength() << endl << circle.getRadius();
+}
+
+// --------------------------------------------------------------
+
+class Circle2 {
+public:
+    const double PI = 3.1415926;
+    void printArea();
+    void printLength();
+    void printRadius();
+
+    Circle2(double radius) : radius(radius) {
+        area = radius * radius * PI;
+        length = radius * 2 * PI;
+    }
+
+    Circle2(const Circle2 &c2) {
+        radius = c2.radius;
+        length = c2.length;
+        area = c2.area;
+    }
+
+private:
+    double radius = 0;
+    double length = 0;
+    double area = 0;
+};
+
+void Circle2::printArea() {
+    cout << "Area: " << area << endl;
+}
+
+void Circle2::printLength() {
+    cout << "Length: " << length << endl;
+}
+
+void Circle2::printRadius() {
+    cout << "Radius: " << radius << endl;
+}

CPP-Learning.md

@@ -0,0 +1,3 @@
+# CPP-Learning
+
+