ifstream and csv

[topchef]

I have a text file thats separated by colons for example

c:toyota:2006:corolla:56000 (type(car or truck):make:year:model:mileage)

I am running into errors on how to separate each and store them into respective variables

char type;
char *make;
char model; //Have to put model into an int*, so I have been typecasting into an int
char *model;
int mileage;

I am running into a problem where its reading the colons into the MAKE variable since its defaulted to char *make = new char[100]; since the make of the vehicles vary.

i have tried

ifstream fin;

fin >> type >> COLON >> make etc...

but just crashes the program as im assuming its just storing the whole into the make pointer.

Any help would be great, thanks!

[topchef]

Also, I can read it all into a temp char pointer but then how would you be able to parse into the variables?

[Chervil]

You could use c-strings and strtok() to split the string at each colon.
Or use a stringstream. The following code assumes you have used getline() to read a single line from the file into a string.

#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>

    using namespace std;

int main()
{
    string line = "c:toyota:2006:corolla:56000";
    istringstream ss(line);

    const char colon = ':';
    string word;
    while (getline(ss,word, colon))
    {
        cout << word << endl;
    }


    // Alternative version
    ss.clear(); // reset flags.
    ss.str(line);


    char type;
    char make[20];
    char model[20];
    int year;
    int mileage;

    getline(ss,word, colon);
    type = word[0];
    getline(ss,word, colon);
    strcpy(make, word.c_str());
    getline(ss,word, colon);
    year = atoi(word.c_str());
    getline(ss,word, colon);
    strcpy(model, word.c_str());
    getline(ss,word, colon);
    mileage = atoi(word.c_str());

    cout << "Type: "      << type
         << "  Make: "    << make
         << "  Model: "   << model
         << "  Year: "    << year
         << "  Mileage: " << mileage
         << endl;


    return 0;

}

[topchef]

Thanks I havent utilized getline or strtok but Ill give it a try!

Thanks!

[topchef]

So I am trying to store year and mileage into an integer pointer by doing a loop but realized that i am using a string variable so its not working correctly. Any tips ?

[topchef]

does atoi store parse the integers into a character array?

i am trying to do the following

char model[4];
int *modelPtr;

model = atoi(word.c_str());
for(int i =0; i < 4; i++)
modelPtr[i] = (int)model[i];

[Chervil]

atoi() takes a character string and returns an integer - assuming the string contains a valid representation of an int, such as "-1" or "+23" or "7654".
http://www.cplusplus.com/reference/cstdlib/

I'm having difficulty understanding what you need to do with model. I thought that was a string, such as "corolla". As such, it cannot be used with atoi() because it is ordinary text, not a numeric value.

In that context, the code you posted above doesn't seem to make sense, I wouldn't have any idea of how to fix it.

Perhaps you could describe what it is you need to do, or give the relevant part of the specifications for this project.