Как сделать, чтобы при вводе данных "31 февраля" выдало "неизвестная операция"? с++ // 2.cpp: определяет точку входа для консольного приложения. #include "stdafx.h" #include using namespace std; int main() { int month, day; cout < < "programma opredeleniya znaka zodiaka" < < endl; cout < < "vvedite mecyac: "; cin > > month; cout < < "vvedite den: "; cin > > day; switch (month) { case 1: if (day < 21) cout < < "kozerog" < < endl; else cout < < "vodoley" < < endl; break; case 2: if (day < 19) cout < < "vodoley" < < endl; else cout < < "ryby" < < endl; break; case 3: if (day < 21) cout < < "ryby" < < endl; else cout < < "oven" < < endl; break; case 4: if (day < 20) cout < < "oven" < < endl; else cout < < "telec" < < endl; break; case 5: if (day < 21) cout < < "telec" < < endl; else cout < < "bliznecy" < < endl; break; case 6: if (day < 22) cout < < "bliznecy" < < endl; else cout < < "rak" < < endl; break; case 7: if (day < 23) cout < < "rak" < < endl; else cout < < "lev" < < endl; break; case 8: if (day < 23) cout < < "lev" < < endl; else cout < < "deva" < < endl; break; case 9: if (day < 23) cout < < "deva" < < endl; else cout < < "vesy" < < endl; break; case 10: if (day < 23) cout < < "vesy" < < endl; else cout < < "skorpion" < < endl; break; case 11: if (day < 23) cout < < "skorpion" < < endl; else cout < < "strelec" < < endl; break; case 12: if (day < 22) cout < < "strelec" < < endl; else cout < < "kozerog" < < endl; default: cout < < "neizvestnaya operaciya"< } system("pause"); return 0; }