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On May 31, 3:20*am, A Moose in Love <parkstreetboo...@gmail.com>
wrote:
> I need to know in a simple way, how to create files, open them, write
> to them, save them, and close them. *I've googled and have come up
> with information that doesn't seem to work. *For example:
> // basic file operations
> #include <iostream>
> #include <fstream>
> using namespace std;
>
> int main () {
> * ofstream myfile;
> * myfile.open ("example.txt");
> * myfile << "Writing this to a file.\n";
> * myfile.close();
> * return 0;
>
> }
>
> This does not work. *I cannot find a file after running this little
> program called 'example.txt'.
> I'm not a programmer; I just need to do this.

Being not a programmer is OK, but do you at least know what operating
system and C++ compiler you are using? With that information available
people might be able to help you to find that "example.txt" of yours.

On 05/31/11 02:22 PM, A Moose in Love wrote:
>> people might be able to help you to find that "example.txt" of yours.
>
> I looked for the file. I opened 'Control Panel' and searched. I
> have Windows XP.

The file will be in the directory where you ran the programme. If you
don't know where that is, try asking on a group or forum dedicated to
your IDE.

--
Ian Collins

On 5/30/2011 7:33 PM, Ian Collins wrote:
> On 05/31/11 02:22 PM, A Moose in Love wrote:
>>> people might be able to help you to find that "example.txt" of yours.
>>
>> I looked for the file. I opened 'Control Panel' and searched. I
>> have Windows XP.
>
> The file will be in the directory where you ran the programme. If you
> don't know where that is, try asking on a group or forum dedicated to
> your IDE.
>

1) Open up a command prompt (emulated dos prompt.)

The command prompt should be in you accessories directory.

2) Change to the root of the drive with:

cd \

3) Enter:

dir filename.exe /s

Make sure you replace "filename.exe" with the name of the file you are
looking for. Let the above command complete, you should see text
telling you where the file is, or that file was not found. If you are
in the root, it has scanned the whole disk and that filename.exe dos not
exist on the drive.

Regards,
JS

On Mon, 30 May 2011 19:22:58 -0700 (PDT), A Moose in Love
<> wrote:

>I looked for the file. I opened 'Control Panel' and searched. I
>have Windows XP. I use for a compiler, I use Bloodshed Dev - C++
>4.9.9.2. Here is my source code for the program in question. (if
>that helps?)
>This is a program to analyze pace as pertains to horse racing.

[snip code for brevity]

Nowhere in your code does a file get opened or written.

On Mon, 30 May 2011 19:22:58 -0700 (PDT), A Moose in Love
<> wrote:

>I looked for the file. I opened 'Control Panel' and searched. I
>have Windows XP. I use for a compiler, I use Bloodshed Dev - C++
>4.9.9.2. Here is my source code for the program in question. (if
>that helps?)
>This is a program to analyze pace as pertains to horse racing.

You never write a file.
Using your printData function as a model, create a writeData function
replacing all your cout with myfile and call it from your
lengthOfRaceFunction. Now you will need to write some kind of inteface
for getting user input for specifying the file names.

void writeData()
{
ofstream myfile;
myfile.open ("example.txt");
cout << "Writing data file." << endl;

myfile.precision(4);
//write << "\n\n*************************" << endl << endl;
myfile << "Horse Number: " << horseNumber << endl;

myfile << "TOTAL PACE: " << TP << endl;

myfile << "\n____________________" << endl;
myfile << "VELOCITY" << endl;
//myfile << "\nfirstFraction: " << firstFraction << endl;
//myfile << "secondFraction: " << secondFraction << endl;
//myfile << "thirdFraction: " << thirdFraction << endl;
myfile << "EP: " << EP << endl;
myfile << "AP: " << AP << endl;
myfile << "SP: " << SP << endl;
myfile << "FW: " << FW << endl;
//myfile << "FX: " << FX << endl;
myfile.precision(3);
//myfile << "ELDiff: " << ELDiff * 100 << endl;
myfile << "____________________" << endl;

myfile.precision(4);
myfile << "\nENERGY" << endl;
myfile << "\ntotal energy: " << energy << endl;
//myfile << "firstFraction: " << firstFractionEnergy << endl;
//myfile << "secondFraction: " << secondFractionEnergy << endl;
//myfile << "thirdFraction: " << thirdFractionEnergy << endl;
myfile << "EP: " << EPEnergy << endl;
myfile << "AP: " << APEnergy << endl;
myfile << "SP: " << SPEnergy << endl;
myfile << "FW: " << FWEnergy << endl;
//myfile << "FX: " << FXEnergy << endl;
myfile.precision(3);
//myfile << "ELDiff: " << ELDiffEnergy * 100 << endl;
myfile << "____________________" << endl;

myfile.precision(4);
myfile << "\nSYNTHESIS" << endl;
//myfile << "\ntotal energy: " << energy << endl;
//myfile << "\nfirstFraction: " << firstFractionSynthesis <<
endl;
//myfile << "secondFraction: " << secondFractionSynthesis <<
endl;
//myfile << "thirdFraction: " << thirdFractionSynthesis << endl;
myfile << "EP: " << EPSynthesis << endl;
myfile << "AP: " << APSynthesis << endl;
myfile << "SP: " << SPSynthesis << endl;
myfile << "FW: " << FWSynthesis << endl;
//myfile << "FX: " << FXSynthesis << endl;
myfile.precision(3);
//myfile << "ELDiff: " << ELDiffSynthesis * 100 << endl;
myfile << "____________________" << endl;
//myfile << "\n\n*************************" << endl << endl;

myfile.close();
}

On Tue, 2011-05-31, A Moose in Love wrote:
....
> 4.9.9.2. Here is my source code for the program in question. (if
> that helps?)
> This is a program to analyze pace as pertains to horse racing.
>
> """
....

>
> void lengthOfRaceFunction()
> {
....
> if (lengthOfRace != 5 & lengthOfRace != 5.5 & lengthOfRace != 6 &
> lengthOfRace != 6.5 & lengthOfRace !=7 &
> lengthOfRace != 8 & lengthOfRace != 8.2 & lengthOfRace != 8.3 &
> lengthOfRace != 8.5 & lengthOfRace != 9)

I haven't read all of it (it was kind of hard to read), but two
obvious bugs:

- you can't reliably use != on doubles
- don't confuse the '&&' and the '&' operators

/Jorgen

--
// Jorgen Grahn <grahn@ Oo o. . .
\X/ snipabacken.se> O o .

Jorgen Grahn <grahn+> writes:
> - you can't reliably use != on doubles

Of course one shouldn't do so blindly, but there are certainly cases
where it makes sense to use != or == on doubles.

E.g., comparison of doubles holding integral values that result from an
explicit assignment should be fine (double d = 47; .... if (d != 47) ).
This is very useful for detecting explicitly assigned out-of-band (for
the algorithm) values.

[I guess some fractional values (e.g. 0.5) should in practice also be OK
since they're exactly representable in any sane radix (2, 10, 16).]

-Miles

--
Consult, v.i. To seek another's disapproval of a course already decided on.