File to Structure?

[TheShadow1]

How do i go from a file containing data, like ...

MJ914
Porsche
914-6
Irish_Green
2
2700
30000
40000

TO

struct car
{
char rego[6];
char make[15];
char model[10];
char colour[15];
int cap[4];
int doors[1];
int costp[6];
int sellp[6];
};

[TheShadow1]

Re: File to Structure?

struct car
{
char rego[6];
char make[15];
char model[10];
char colour[15];
int cap[4];
int doors[1];
int costp[6];
int sellp[6];
};


void main()

ifstream fin;

for(x = 0; x++; x > 11 || x = EOF;)
ifstream fin("cars.dat") ;
fin >> car.rego >> car.make >> car.model >> car.colour >> car.cap >>
car.doors >> car.costp >> car.sellp >>endl;

[TheShadow1]

Re: File to Structure?

I dont think thats the way to do it anyway ...

i think need to use getline();

[Owen Jacobson]

Re: File to Structure?

On Wed, 13 Oct 2004 21:52:07 -0400, TheShadow1 wrote:
[color=blue]
> How do i go from a file containing data, like ...
>
> MJ914
> Porsche
> 914-6
> Irish_Green
> 2 // <--
> 2700 // <--
> 30000 // <--
> 40000 // <--
>
> TO
>
> struct car
> {
> char rego[6];
> char make[15];
> char model[10];
> char colour[15];[/color]

These might be better off as std::string values, as defined in the
standard <string> header.
[color=blue]
> int cap[4]; // <--
> int doors[1]; // <--
> int costp[6]; // <--
> int sellp[6]; // <--
> };[/color]

The corresponding fields in your input data don't look like integer
*arrays* to me...

--
Some say the Wired doesn't have political borders like the real world,
but there are far too many nonsense-spouting anarchists or idiots who
think that pranks are a revolution.

[Malte Starostik]

Re: File to Structure?

TheShadow1 schrieb:
[color=blue]
> struct car
> {
> char rego[6];
> char make[15];
> char model[10];
> char colour[15];[/color]

Those are dangerous and cannot be used for streaming as used below, use
std::string instead of char arrays.
[color=blue]
> int cap[4];[/color]

This declares an array of four integers where you presumably wanted an
integral type capable of storing values with up to four decimal digits.
[color=blue]
> int doors[1];
> int costp[6];
> int sellp[6];[/color]

Same for those.
[color=blue]
> };
>
>
> void main()[/color]

main() always returns int (and its body needs enclosing braces like any
other function).
[color=blue]
>
> ifstream fin;
>
> for(x = 0; x++; x > 11 || x = EOF;)[/color]

You never declared x nor EOF, there's one ; too much in the for
statement and the expressions' order is most probably wrong.
[color=blue]
> ifstream fin("cars.dat") ;
> fin >> car.rego >> car.make >> car.model >> car.colour >> car.cap >>
> car.doors >> car.costp >> car.sellp >>endl;[/color]

Except for missing error checking, that should work after dropping the[color=blue][color=green]
>>endl part and fixing the above issues.[/color][/color]

HTH,
Regards,
Malte

[TheShadow1]

Re: File to Structure?

So something more like ...

struct Car
{
string rego;
string make;
string model;
string colour;
int cap;
int doors;
int costp;
int sellp;
}

[John Harrison]

Re: File to Structure?


"TheShadow1 " <trashedone@gma il.com> wrote in message
news:1bff6daf25 efd3f8553337114 419eb60@localho st.talkaboutpro gramming.com...[color=blue]
> So something more like ...
>
> struct Car
> {
> string rego;
> string make;
> string model;
> string colour;
> int cap;
> int doors;
> int costp;
> int sellp;
> }[/color]


Yes, looks a lot better.

[Thomas Matthews]

Re: File to Structure?

TheShadow1 wrote:[color=blue]
> So something more like ...
>
> struct Car
> {
> string rego;
> string make;
> string model;
> string colour;
> int cap;
> int doors;
> int costp;
> int sellp;
> }
>[/color]

/* Data file from previous article:
MJ914
Porsche
914-6
Irish_Green
2
2700
30000
40000
*/

struct Car
{
// Same as above
friend istream& operator>>(istr eam& input, Car& car_);
};

istream& operator>>(istr eam& input, Car& new_car)
{
getline(input, rego);
getline(input, make);
getline(input, model);
getline(input, colour);
input >> cap >> doors >> costp >> sellp;
return input;
}

Now to use this:
int main(void)
{
ifstream data_file("data _file.txt");
Car my_car;

// Input car from data file:
data_file >> my_car;

return EXIT_SUCCESS;
}

I suggest you also overload operator<< so you can
display the contents of a Car.

--
Thomas Matthews

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