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Encoding and Decoding; Char to Hex -> Hex to Char

codingneophyte (1)
Hello folks,

I've been at this for quite some time and I'm at my wits end. I'm basically trying to convert a string or text file to hex. I think I got that part, but my issue is when I try to take the 'coded' txt file back to a normal easily readable file.
I have two functions listed below...
Is it possible to decode using fout.put(sprintf(&chEncoded[i],"%c", ch[i])); ? Or is my approach wrong all together?

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int encodeTxt()
{
    const int SIZE = 61;
    const int chSize = 301;
    char fileName[SIZE];
    char chEncoded[chSize];     
    int i=0;
    ifstream fin;
    ofstream fout;
    
    cout << "Enter text file name : ";
    cin >> fileName;
    
    //Open the file       
    fout.open("coded.txt");
    fin.open(fileName, ios::in);
    
    if (!fin)
    {
        cout << fileName << " could not be opened. \n";
        return 0;
    }
    
    fin.getline(ch, chSize);
    for (i = 0; i < 301; i++)  
    {
        
        //fout.put(printf("%x",ch[i]));
        fout.put(sprintf(&chEncoded[i],"%x", ch[i]));
    }
    fin.close();
    cout << "\nYour file has been encoded. ";
    return 0;
}

int decodeTxt()
{
    const int SIZE = 61;
    const int chSize = 301;
    char fileName[SIZE];
    char ch[chSize];            
    char chEncoded[chSize];     
    int i=0;
    ifstream fin;
    ofstream fout;
    
    cout << "Enter Text file to be decoded: ";
    cin >> fileName;
    
    //Open the file       
    fout.open("decoded.txt");
    fin.open(fileName, ios::in);
    
    if (!fin)
    {
        cout << fileName << " could not be opened. \n";
        return 0;
    }
    
    fin.getline(ch, chSize);
    for (i = 0; i < chSize; i++)  
    //while (!fin.eof())
    {
        
        //fout.put(printf("%c",ch[i]));
        //printf(&chEncoded[3],"%c", ch[3]);
        fout.put(sprintf(&chEncoded[i],"%c", ch[i]));
        fin.getline(ch, chSize);
        
    }
    fin.close();
    cout << "\nYour file has been decoded. ";
    return 0;


Sample txt file should be like this:

The rain in Spain is quite nice!

Thanks in Advance.
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