从文件输入不同类型的数据，不使用向量

Question

First off I am new to C++ so dont mark me down for not knowing something or being incorrect. I have a file that I am trying to read into my C++ program. I am doing a practice for a project. I have to create and object, and where each instance represents contines one line of the file with seven variables. The file contains a database. The format of the text file is:

// String String Character Int Int Char Int 
// String String Character Int Int Char Int
// etc. 

There is exactly 350 data members. There is never more. So I am using arrays. I can not use vectors for this project as it is specified not to.

What is the best way to approach this with only using arrays?

my first attempt was to create a 3 arrays:

        for (int l = 0; l < max_size; l++) {
            myfile >> myintarray[l];
        }
        for (int k = 0; k < max_size; k++) {
            myfile >> mychararray[k];
        }
       for (int i = 0; i < max_size; i++) {
            myfile >> myarray[i];
            // print artists and title; 
        }

       // Then I have to put it the object. Store as such....
        myloop = 0;
        a = 2;
        b = 5;
        while (myloop < 50) {
            myartwork[myloop].setRoom(mychararray[b]);
            myartwork[myloop].myart.setMeduim(mychararray[a]);
            a += 7;
            b += 7;
            myloop += 1;
        }
       // more code where I do the same thing with characters
       // same things with strings.....

When I tried that it printed off the contents. it was inccorect. and mumbo jumbo. So I think it is because I am when I try to store the all number array it cant take characters and prints out an error? I am not sure if that is correct.

So then I tried to use only one array that was string then convert it each string into a char or int type. and that was a pain and I get an error. and I am not sure how to handdle the character type.

            myloop = 0;
            a = 3;
            b = 4;
            c = 6;
            while (myloop < 50) {
                //std::stoi (str_dec,&sz)
                std::string::size_type sz;

                // my object ( instance). data......Try to convert this. 
                myartwork[myloop].mymysize.setLength(std::stoi(myarray[a],  &sz));
                myartwork[myloop].mymysize.setWidth(std::stoi(myarray[b], &sz));
                myartwork[myloop].setPrice(std::stoi(myarray[c], &sz));
                a += 7;
                b += 7;
                c += 7;
                myloop += 1;
            }

Is there a better way to do this then these two methods? Am I on the right track?

Answer 1

Using many arrays with the same capacity is usually a sign of a poor design.

Let's talk modeling here. Let's define a record as a container of fields. The record would correspond with one text line in your file. So, model it:

struct Record
{
    std::string s1;
    std::string s2;
    char        c1;
    int         i1;
    int         i2;
    char        c1;
    int         i3;
};

Now you can declare a table, or an array of records:

#define MAXIMUM_RECORDS (350)
Record database[MAXIMUM_RECORDS];

Some more things to do:

1. Overload operator >> to read from input file.
2. Implement constructors, copy constructors and assignment operator.
3. Overload comparison operators: == , > , etc.
4. Overload operator << to print the record.