Is there a way to restrict input to integer/double in this format in c++ -

i trying make simple calculator in c++. in first version, had menu based system , asked input 1 after other easy validate integer. however, realised can user enter question in format enter on real calculator.

double first; char choice; double second;  cin >> first >> choice >> second; 

however stuck on how can check because of solution have looked @ follow format, not know how can implement because cin takes in 3 pieces of data.

int x; cin >> x;  if (!cin)  {     // not number } 

you cannot restrict user types @ terminal. best thing can detect input not appropriate, , ask input again.

while ( !(cin >> first) ) {    cout << "please enter floating point number: "    cin.clear();    cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); } 

do same thing other numbers.