Sum of a vector of integers - c++

Question

I created a program that let's the user input up to 10 integers and then it will print out the sum of the inputted integers. However I want to stop the program when the user tries to input more than 10 integers or when the user types in "DONE". I didn't really get it to work because when the user types in something other than an integer (including the string "DONE"), it will stop. I only want it to stop when the user types in "DONE". If the user types in something like "Hello" I want the program to crash.
This is how it should look:
Enter up to 10 numbers:
12
12
4
DONE
The sum of the integers is: 28
What's wrong with my code? I am referring to my void read_numbers function. As I mentioned, I want it to stop ONLY when the user inputs the string "DONE" or when the user inputs more than 10 integers.
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
struct Number_Type {
vector<int> numbers;
};
void read_numbers(Number_Type& number) {
int digit{};
string line;
// char space = ' ';
while ((line != "DONE") && (number.numbers.size() != 10)) {
cin >> digit;
getline(cin, line);
number.numbers.push_back(digit);
}
}
int number_sum(Number_Type const& number) {
int sum{};
for (int i{}; i < number.numbers.size(); ++i) {
sum += number.numbers[i];
}
return sum;
}
int main() {
Number_Type number;
cout << "Enter up to 10 numbers: " << endl;
read_numbers(number);
cout << "The sum of the integers is: " << number_sum(number);
}

Answer 1

Fist you have to read all your inputs as strings. Then you can use std::from_chars to check if your input was a valid integer (without having to do exception handling, which std::stoi will need). Example here (live demo https://onlinegdb.com/UANchB1mn)
#include <iostream>
#include <string>
#include <vector>
#include <charconv>
auto read_numbers(const std::size_t max_numbers)
{
std::vector<int> values;
int value{};
std::string input;
do
{
std::cout << "Enter number " << values.size() + 1 << " of " << max_numbers << " (or DONE to stop) : ";
std::cin >> input;
// std::stoi is an option but then you would need do exception handling
auto result = std::from_chars(input.data(), input.data() + input.size(), value);
if (result.ec == std::errc())
{
values.push_back(value);
}
}
while ((input != "DONE") && (values.size() < max_numbers));
return values;
}
int main()
{
auto values = read_numbers(3);
std::cout << "you entered : ";
for (const auto value : values)
{
std::cout << value << " ";
}
return 0;
}