c++ instantiate several classes if a condition is true - c++

Question

Is there a way I can make this work?
I want to create 5 instances of bank if age is greater than 17, but I am getting this error:
[Error] no matching function for call to 'Bank::Bank()'
I need to get this right for my assignment in school.
#include <iostream>
#include <string>
using namespace std;
class Bank{
string Fullname;
string StateOfOrigin;
int Age;
public:
Bank(string name, string state, int age){
Fullname = name;
StateOfOrigin = state;
Age = age;
}
string getname(){
return Fullname;
}
string getstate(){
return StateOfOrigin;
}
int getage(){
return Age;
}
};
int main(){
Bank customer[20];
int x,y,z,age;
string name;
string state;
cout<<"==============================="<<endl;
cout<<"Welcome To Hojma Bank.Plc"<<endl;
cout<<"How many accounts do you want to create? \n";
cin>>y;
for(int k = 0; k < y; k++){
cout<<"Please input your fullname"<<endl;
cin>>name;
cout<<"Please input your state of origin"<<endl;
cin>>state;
cout<<"Please input your age";cout<<endl;
cin>>age;
if(age >= 18){
Bank customer[y](name,state,age);
cout << customer[y].getname();
}
}
}

Answer 1

Bank customer[20];
Here you default-construct twenty Bank objects (oddly called customer??). Or, at least, you tried to, but your Bank class has no default constructor. Neither should it, from what I can tell.
Bank customer[y](name,state,age);
cout << customer[y].getname();
Here I guess you tried to "declare" individual array elements, but it doesn't work like that.
Also your usage of y is wrong; you can accept y maximum, but you probably meant to use the current loop counter value, k. That's broken too because you have a filter on age so you might skip some array elements.
Why not use a nice tasty std::vector, and add new customers at will? Then you can also get rid of those confusing ints, half of which you're not even using.
int main()
{
int y = 0;
cout << "===============================\n";
cout << "Welcome To Hojma Bank.Plc\n";
cout << "How many accounts do you want to create?" << endl;
cin >> y;
std::vector<Bank> customers;
for (int i = 0; i < y; i++) {
int age;
string name;
string state;
cout << "Please input your full name" << endl;
cin >> name;
cout << "Please input your state of origin" << endl;
cin >> state;
cout << "Please input your age" << endl;
cin >> age;
if (age >= 18){
customers.emplace_back(name,state,age);
cout << customer.back().getname();
}
}
}
You could do with some error checking on your user input, too. And rename that class to Customer.

Answer 2

If you create an array of objects (Bank customer[20]), the class needs to have a default constructor. Just define something like this:
Bank() : Fullname(""), StateOfOrigin(""), Age(0) {}