Reading a file using c++ need a little help in reading columns

[DAWeinG]

My friend needs help reading the rows of a file:

The file looks like this:

L D Q
------------------------------
34 2 1
45 3 2
23 1.5 0

I need the program to READ the separate doubles there and store them each into a variable, (ie. x = 34, y = 2, z = 1); Each three numbers of a row at a time.

Suggestions? TIA

 

[notfred]

I haven't worked in C++ for a while, but it's something like:

int array[50];

for(int i = 0; i <50; i++){


aw, hell, I can't remember.

in perl you can do this:

open (FILEHANDLE, "filename");
@array_of_lines = <FILEHANDLE>

foreach $line(@array_of_lines){
@numbers = split /\s/, $line;

#do whatever you need with $numbers[0], $numbers[1], $numbers[2]

}

 

[DAWeinG]

hehe thanks anyways

 

[bUnMaNGo]

is it *always* going to have the first two lines, then having three doubles per line? without error checking, you can do something like:

inFile >> a >> c >> d; // assuming x, y, z are chars
inFile.getline();
while(inFile >> x >> y >> z){
// do whatever you want with x, y, and z here
}

you might have to fumble around with the getline to get rid of the \n at the end of the first two lines. but this is pretty much it.

 

[DAWeinG]

Hmm ya there two lines are always going to be there How can I skip those two lines? Is there a command which allows me to do that?

 

[Platypus]

you want to use a getline. Why don't you store the entire line as a variable and then make a function that seperates the numbers into smaller variables using spaces etc.

Ex: 34, 2, 1 = variable 1

Then run variable 1 through your function and seperate each one into seperate variables.
It may seem like a lot of work, but if you have a lot of those lines, making two loops is a lot easier then doing it with arrays.

 

[bUnMaNGo]

err the first two lines of my code should do it... read in the first three characters, then just getline the next line... as I said the getline might grab the '\n' from the first line, so you might another getline to get the 2nd. let me know if it works.

 

[DAWeinG]

Hmm thanks for the suggestions!