////////////////////////////////////////////////////////////// //***************CHALLENGE:PRONIC NUMBER TEST***************** //****************Author: Petros Simidyan********************* ////////////////////////////////////////////////////////////// #include using namespace std; inline int consMult(const int input) { return input*(input + 1); } bool isPronic(const int input) { int i = 0; while (true) { if (consMult(i++) == input) { return true; break; } if (consMult(i) > input) return false; } } int main() { int input; while (true) { cout << "Please give an positiv even integer number greater or equal to 1!" << endl; if (cin.peek() == '-') {//making sure, that ght input an positiv integer is cout << "The given integers should be positiv!" << endl; cin.clear(); cin.ignore(1000, '\n'); } else { cin >> input; if (cin.fail()) {//check, that the input is an integer cout << "Wrong input!" << endl; cout << "Your input is eather not an integer, or not even, or less than 1!" << endl; cin.clear(); cin.ignore(1000, '\n'); } else { cout << "Your input is "; if (!isPronic(input)) cout << "not "; cout << "a pronic number!" << endl; } } } return 0; }