Reading a file where the user has to provide some parameters

Question

OK so i know the question is a bit confusing (dont downvote right away, let me explain...)

I have a text file like this:

dim
coins
oponent

I want to read this text file but while reading it, ask the user for specific responses, for example:

"reads line with the word dim" -> asks user the dimensions -> next line -> "reads line with coins" -> asks user how many coins and so forth until the EOF.

Is there anyway to do this? if yes, can you show me how?

Thanks and plz dont downvote, just tell me what's wrong and i will edit the post..

EDIT: This is the way i'm reading the file and asking the user input

void LeitorFich::lerFicheiro(string nomeFich)
{
    int i, j, t;
    string linha, nome, nome1;
    ifstream fich(nomeFich);

while(getline(fich, linha))
{
    istringstream iss(linha);

    iss >> nome;

    if(nome == "dim")
    {
        cout << nome << " ";
        iss >> i >> j;
    }
}
cin.get();

fich.close();
}

Why don't you code what you have just described, take input, based on input ask user the question. — Shamim Hafiz, Aug 24 '17 at 22:41
@ShamimHafiz i tried that but when i give the dimensions, it stops reading the file. — F.Dinis, Aug 24 '17 at 22:42
The required effort is what have you tried? and What wrong you get? If you get no error why you ask then? — Raindrop7, Aug 24 '17 at 22:44
@Raindrop7 there is no error, the values go where they are supposed to but it stop in dim, it doesnt reach the other 2 parameters — F.Dinis, Aug 24 '17 at 22:48
The only "asking for input" going on in this loop is a single character fetch per loop iteration which ends up being discarded. And fyi read why [`while(!fich.eof())` is wrong **here**](https://stackoverflow.com/questions/5605125/why-is-iostreameof-inside-a-loop-condition-considered-wrong) — WhozCraig, Aug 24 '17 at 22:49
^^^ ...and remove the stand-alone `getline` invoke in the loop. I.e. *move* that to be the loop condition rather than ignoring whether it failed or not. — WhozCraig, Aug 24 '17 at 22:52
@Raindrop7 i want it to read the entire text file while letting the user input some parameters — F.Dinis, Aug 24 '17 at 22:57
`iss >> i >> j` This tries to read the two integer values from the line just read. — O'Neil, Aug 24 '17 at 23:01
**Always** check *after* reading that the read was successful, e.g.: `if (in >> x >> y) { use(x, y); } else { deal_with_failed_read(); }` — Dietmar Kühl, Aug 24 '17 at 23:08

score 1 · Accepted Answer · answered Aug 24 '17 at 23:04

A simple example will look like this:

Consider I have a file called "test.txt" which contains the very content as yours

string sLine;

ifstream inFile("test.txt");

int Dim1, Dim2, coins, oponent;

while(inFile >> sLine ){
    if("dim" == sLine){
        std::cout << "Dim1: ";
        std::cin >> Dim1;
        std::cout << std::endl;

        std::cout << "Dim2: ";
        std::cin >> Dim2;
        std::cout << std::endl;
    }
    else
        if("coins" == sLine){
            std::cout << "coins: ";
            std::cin >> coins;
        }
    else
        if("oponent" == sLine){
            std::cout << "oponent: ";
            std::cin >> oponent;
        }
}

inFile.close();

Yes as long as your words are not separated by white spaces: `dim, coins,...` — Raindrop7, Aug 24 '17 at 23:08

Reading a file where the user has to provide some parameters

1 Answers1