如何将带有字母，数字和符号的字符串转换为带有ascii数字的双精度型？

Question

如何将包含字母，数字和符号的字符串转换为具有ascii数字的双精度字符

#include "pch.h"
#include <iostream>
#include <fstream>  
#include <string>
#include <stdlib.h>



using namespace std;

int main()
{
    string one;
    long double file_ascii;
    ifstream PW_File;
    PW_File.open("PW.STORED");
    char output[100];
    if (PW_File.is_open()) {
        while (!PW_File.eof()) {
            PW_File >> output;
            cout << output << "\n\n\n\n";
            one = output;
            file_ascii = stoi(one);
            cout << file_ascii;


        }
    }
    PW_File.close();
    return 0;
}

我认为您对字符串，字符和数字感到困惑