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#include <iostream> class TridaA { protected: virtual void metoda () { std::cout << "metoda A" << std::endl; } public: void run () { metoda (); } }; class TridaB : public TridaA { protected: void metoda () { std::cout << "metoda B" << std::endl; } }; int main () { TridaA a; a.run (); TridaB b; b.run (); return 0; }
#include <iostream> using namespace std; struct complex { double re, im; }; complex operator+ (complex a, complex b) { complex tmp; tmp.re = a.re + b.re; tmp.im = a.im + b.im; return tmp; } ostream & operator<< (ostream &vstup, complex x) { vstup << x.re << " + j" << x.im << endl; return vstup; } int main () { complex X = {2.3, 4.8}; complex Y = {3.2, 8.4}; complex Z; Z = X + Y; std::cout << Z.re << " + j" << Z.im << std::endl; cout << Z; return 0; }
#include <iostream> #include <fstream> int main () { std::ifstream file; file.exceptions (std::ifstream::failbit | std::ifstream::badbit); try { // potencialne rizikovy kod - muze ukoncit beh programu file.open ("text.txt"); while (!file.eof()) file.get(); file.close(); } catch (std::ifstream::failure e) { // kod, ktery osetruje vyjimku std::cout << "I/O chyba pri praci se souborem" << std::endl; std::cout << e.what() << std::endl; } std::cout << "beh programu dale pokracuje" << std::endl; return 0; }
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