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POHow should I write classes? C++
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copied!<p>Hey.. I don't really get them. I read a tutorial about classes in C++, and I don't get a few things: In every example and tutorial that I've seen, functions are never written inside the class! For example, why write a class like this:</p> <pre><code>#include <iostream> using namespace std; class test { private: int x, y; public: test (int, int); int tester () {return x + y; } }; test::test (int a, int b) { x = a; y = b; } int main() { test atest (3, 2); test atest2 (2, 6); cout << "test1: " << atest.tester() << endl; cout << "test2: " << atest2.tester() << endl; return 0; } </code></pre> <p>or like this:</p> <pre><code>#include <iostream> using namespace std; class test { private: int x, y; public: void set_values (int,int); int testfunc () {return x + y; } }; void test::set_values (int a, int b) { x = a; y = b; } int main() { test tester; tester.set_values (3, 2); cout << "test1: " << tester.testfunc() << endl; return 0; } </code></pre> <p>instead of simply like this:</p> <pre><code>#include <iostream> using namespace std; class test { public: int tester (int x, int y) { return x + y; } }; int main() { test atest; cout << atest.tester(3, 2) << endl; return 0; } </code></pre> <p>Honestly, I just don't get it!</p> <p>Why do I need private members??</p> <p>When and how should I use destructors?</p> <p>How should I generally write my classes?</p> <p>I'm very confused here and I really need somebody to clear up things for me... thanks</p>

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