I need your help

Question

#include <iostream>
#include <sstream>
#include <vector>
#include <string>

using namespace std;

int main(){
string changeable;
int number;
vector<int> countChars;

cin >> changeable;
cout << changeable.at(0);

stringstream convert(changeable.at(0));

convert >> number;
cout << number;

return 0;
}

Answer 1

What about using a char instead, I mean, if you only want to convert a one digit number? that way you only need to manipulate the char to get its digit e.g.

char input = '9';
int value = (int) input - '0';

More curiosity, why you only want that very first character from the <changeable> string?

(Edit)
This works, though it is carried out in two steps, may not be what you want : }

stringstream convert;
convert << changeable.at(0);
convert >> number;
cout << number;

Answer 2

the problem is that it can't convert one character from string to int at this line:

stringstream convert(changeable.at(0));