C++ codeblock Linux console menu - c++

Question

I am trying to build a menu on console on C++ with CodeBlock. Is for a course.
I would like to validate garbage enter by the user. For example, the user have to enter a number. If he enters a wrong number, no problem, the program work and continue. But if He enters a letter or some garbage, the program start on infinite loop.
I cannot use system(PAUSE) because I am programming on Linux.
I tried some code like cin.get() or do while with cin.get() but no result.
Here is my code :
#include <iostream>
using namespace std;
void showMenu()
{
cout << "---------------MENU --------------" << endl;
cout << "1- Check balance :" << endl;
cout << "2- Check deposit :" << endl;
cout << "3- Withdraw:" << endl;
cout << "4- Exit" << endl;
cout << "--------------------------------" << endl;
}
int main()
{
int option;
double balance = 500;
do
{
showMenu();
cout << "Option: ";
cin >> option;
cout << "\033[2J\033[1;1H";
switch(option)
{
case 1:
cout << "Balance is: " << balance << " $" << endl;
break;
case 2:
cout << "Deposit amount: " << endl;
double depositAmount;
cin >> depositAmount;
balance += depositAmount;
break;
case 3:
cout << "Withdraw amount: " << endl;
double withdrawAmount;
cin >> withdrawAmount;
if (withdrawAmount <= balance) {
balance -= withdrawAmount;
}
else {
cout << "Not enough money" << endl;
}
break;
default:
cout << "Your choice is invalid ";
do {
cout << '\n' << "Press the Enter key to continue.";
}while (cin.get() != '\n');
}
} while(option != 4);
return 0;
}
Do you have an idea how can I validate easily the garbage enter by the user ?
Thank you for your Help

Answer 1

It works with the code on default part : cin.clear and cin.ignore(). This last one is important. Thank you to user4581301
#include <iostream>
using namespace std;
void showMenu()
{
cout << "---------------MENU --------------" << endl;
cout << "1- Check balance :" << endl;
cout << "2- Check deposit :" << endl;
cout << "3- Withdraw:" << endl;
cout << "4- Exit" << endl;
cout << "--------------------------------" << endl;
}
int main()
{
int option;
double balance = 500;
do
{
showMenu();
cout << "Option: ";
cin >> option;
cout << "\033[2J\033[1;1H";
switch(option)
{
case 1:
cout << "Balance is: " << balance << " $" << endl;
break;
case 2:
cout << "Deposit amount: " << endl;
double depositAmount;
cin >> depositAmount;
balance += depositAmount;
break;
case 3:
cout << "Withdraw amount: " << endl;
double withdrawAmount;
cin >> withdrawAmount;
if (withdrawAmount <= balance) {
balance -= withdrawAmount;
}
else {
cout << "Not enough money" << endl;
}
break;
default:
cout << "\033[2J\033[1;1H"; //for clean screen with Linux
cout << "Your choice is invalid " << endl;
cin.clear();
cin.ignore();
}
} while(option != 4);
return 0;
}