How to parse text from the file into two different variable

Question

I have a text file, here it is:

a 0.240741
; 0.037037
k 0.0925926
s 0.222222
l 0.0925926
d 0.314815
ЏЌд|.–&Фsнcп—#

I need to assign first part of text(char and their frequency) to unordered map, and rest of text(ЏЌд|.–&Фsнcп—#) to string variable.How to do this?

I have a structure:

struct data_maps {
    unordered_map<char, double> char_prob; 
    unordered_map<char, string> char_haffcode; 
    string haffcode_all; 
    string ascii_char; 
};

Code, that supposed to parse the file and assign text to the variables

data_maps parsing_file(string text)
{
    data_maps data;
    ifstream file(text);

    char ch;
    double prob;
    streampos currentPosition;
    if (file.is_open()) {
        while (file >> ch >> prob)
        {
            data.char_prob[ch] = prob;
            streampos currentPosition = file.tellg();
        }

        
        file.seekg(currentPosition);

        string temp;
                while (getline(file,temp)) {
                     data.ascii_char += temp;
                }
    }
    else
        cerr << "Error:file have not opened.";
    return data;
}

When i executing this:

data_maps maps;
maps = parsing_file("D:\\HC_test\\testing.cmph");
for (auto pair : maps.char_prob)
{
    cout << pair.first << " " << pair.second << endl;
}   
cout << maps.ascii_char;

i have this output:

a 0.240741
; 0.037037
k 0.0925926
s 0.222222
l 0.0925926
d 0.314815

Answer 1

while (file >> ch >> prob) reads from the file until you reach the last line where it fails to extract a double. Recovering from that is complicated because the stream is in an error state and you already consumed the character but what you actually need is the whole line¹.

Read lines from the file instead. I present only a rough outline and leave the rest for you (your code isn't missing much actually):

std::string line;
while(getline(file,line) {

   //attempt to read a character and a float:
   std::stringstream ss{line};
   if(ss >> ch >> prob) {
        // it was successful ... use ch and prob
   } else {
        // it was not.. use line
   }
}

Reading strings from the file always succeeds until you reach the end of the file. Extracting a character and a double fails only for the last line where you want to use the full line.

---

¹ I think your code correctly restores the position in the file but does not correctly reset the state of the stream and that's the reason fails to read the last line.