How to prevent a string input for an integer variable? [duplicate] - c++

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How to test whether stringstream operator>> has parsed a bad type and skip it
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How to handle wrong data type input
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I have a switch statement (copied in below) with cases and a default function, but if I enter a string, the code loops endlessly. How can I prevent this? Do I need to move something outside of the do loop? Use a different loop? I'm new to c++ and don't know how I can fix this, despite having tried moving things out of the loop.
void menu() //Opens new function, called menu, which will contain all code for the menu screen.
{
cout << setw(60); //Sets the screen width to 60 in order to centre all outputted text on the menu screen.
std::string text; //Declares the variable "text" as a string.
int choice{}; //Declares an integer "choice" that will contain the menu input.
int choicex{}; //Declares an integer "choicex" that will contain the input that will determine virus activation.
bool valid_input = false;
cout << setw(60);
cout << "ARES" << endl;
cout << setw(61);
std::cout << "MENU\n";
cout << setw(78);
std::cout << "Select one of the following options:\n";
cout << setw(67);
std::cout << "1. Activate Virus\n";
cout << setw(70);
std::cout << "2. Program Information\n";
cout << setw(62);
std::cout << "3. Exit\n";
do
{
std::cin >> choice;
switch (choice)
{
case 1:
system("CLS");
cout << setw(84);
std::cout << "Are you sure? Press 1 to continue, or 2 to go back."; // Prints the spaces
std::cin >> choicex;
if (choicex == 1)
{
system("CLS");
Ares();
}
if (choicex == 2)
{
system("CLS");
menu();
}
if (choicex != 1 and choicex != 2)
{
system("CLS");
cout << setw(80);
std::cout << "Invalid Input. Redirecting to menu.\n";
cout << setw(90);
system("pause");
system("CLS");
menu();
}
case 2:
ProgramInfo();
case 3:
system("CLS");
exit(EXIT_FAILURE);
default:
system("CLS");
cout << setw(60);
std::cout << "Invalid input.\n";
cout << setw(66);
std::cout << "Redirecting to menu.\n";
cout << setw(70);
std::cout << "Press any key to continue.\n";
std::cin.ignore();
system("CLS");
menu();
}
}
while (choice < 1 or choice > 3);
}