// lesson from the book "Grundkurs C++" // 😉 "ground course C++" // // // special thanks to Biraj Patel for his hepful advice // // // This programme needs min 3 numbers for input // // for example: // 1-5 selection, nr 5 programme ends // 5000 distance in meter // 1-5 nr 5 for programme ends, or another run through #include int main() { int choice = 0; // start do - while do{ // selection from 1 - 5 std::cout << "Conversion of distances\n"; std::cout << "-1- inch(Zoll)\n"; std::cout << "-2- foot\n"; std::cout << "-3- yard\n"; std::cout << "-4- mile\n"; std::cout << "-5- Programme ends\n"; std::cin >> choice; std::cout << "Your choice please: " << choice << std::endl; // input failure if(std::cin.fail()){ std::cerr << "Wrong input!\n"; return 1; // programme end } // test for the right choice if((choice < 1) || (choice > 5)){ std::cout << "A wrong choise!\n"; continue; // end of this if } // test for programme end if(choice == 5){ std::cout << "Good bye!\n"; break; // end of this if } double m = 0.0; std::cin >> m; std::cout << "Distance in meter: " << m << std::endl; // input failure if(std::cin.fail()){ std::cerr << "Wrong input!\n"; return 1; // programme end } std::cout << "Your choice is "; // start switch switch( choice ){ case 1: std::cout << m << " meter = " << m/0.0254 << " inch\n\n"; break; case 2: std::cout << m << " meter = " << m/0.3048 << " foot\n\n"; break; case 3: std::cout << m << " meter = " << m/0.9144 << " yard\n\n"; break; case 4: std::cout << m << " meter = " << m/1609.344 << " mile\n\n"; break; // end switch } } while (choice != 5); // do-while end return 0; }

Example do-while