C++ examples for Class:Constructor
Demonstrates use of overloaded constructors.
#include <iostream> using namespace std; #include <math.h> const float PI = 3.14159; // Approximate value of pi. // A sphere class. class Sphere/*from w ww . ja v a 2 s. com*/ { public: float r; // Radius of sphere float x, y, z; // Coordinates of sphere Sphere() { /* doesn't do anything... */ } Sphere(float xcoord, float ycoord,float zcoord, float radius) { x = xcoord; y = ycoord; z = zcoord; r = radius; } ~Sphere() { cout << "Sphere (" << x << ", " << y << ", " << z << ", " << r << ") destroyed\n"; } inline float volume() { return (r * r * r * 4 * PI / 3); } float surface_area() { return (r * r * 4 * PI); } }; void main() { Sphere s(1.0, 2.0, 3.0, 4.0); Sphere t; // No parameters (an uninitialized sphere). cout << "X = " << s.x << ", Y = " << s.y << ", Z = " << s.z << ", R = " << s.r << "\n"; t = s; cout << "The volume of t is " << t.volume() << "\n"; cout << "The surface area of t is " << t.surface_area() << "\n"; return; }