12 replies to this topic

[Djanvk]

First off this is not for homework, I'm not taking classes.

What I'm trying to accomplish is how to read a text file that has numbers separated by spaces like this:

1 3 5 7 ect..

Split it up into the different numbers and change them into Integers.

For some reason I have having a hard time doing this.

I can read the file in but have no Idea how to break up the number into separate numbers.

can anyone point me in the right direction.

Thanks

[Xav]

You need some way to detect the spaces as you read the fıle, then just do a conversıon (parsıng).

[MeTh0Dz]

Read the whole file into a buffer. Then use strtok() with ' ' as the delimiter, and then use atoi() to convert them into integers.

[dcs]

MeTh0Dz|Reb0rn said:

Read the whole file into a buffer. Then use strtok() with ' ' as the delimiter, and then use atoi() to convert them into integers.

Ignoring all characters - Dev Shed - atoi is the low man on the totem pole, strtok should be used wisely. [Some reasons as to why I don't care for getting too chummy with strtok.]

But as to the original question scanf or fscanf (not recommended for newbs) will mostly cover it using %d. Or if you mean C++ let us know. Also, there are very many ways to do this, each with its own nuance. Post an attempt and we'll comment.

[MeTh0Dz]

Interesting, I did not know this. Thanks!

Edited by Jordan, 14 August 2008 - 04:25 AM.
Quit arguing about everything

[dcs]

Au contraire, <removed>. They were all mine.

Edited by Jordan, 14 August 2008 - 04:25 AM.
Watch the language...

[Djanvk]

Thanks for the answers, this bit of code here worked

while (inFile >> x) {
        cardnums[i] = x;
        i++;
    }

[Djanvk]

Also if anyone can explain how this works?

Thanks

[telboon]

I'll use your code for the explanation. Hope you don't mind :)

while (inFile >> x)        //Checks if there's something to read, and reads it in the process

{

        cardnums[i] = x;  //Makes cardnums[i] the integer that had been read.

        i++;                  //Increase counter, to prepare for next cardnums.

}

For me, I'll actually recommend a shorter code.

while (inFile >> cardnums[i]) 

{

        i++;

}

This actually eliminate the use of the buffer(x), hence using less resource and computing power.

Edited by telboon, 17 August 2008 - 09:54 AM.

[dargueta]

You run the risk of buffer overrun with that code. I'd suggest using a for loop, or a while loop that dynamically reallocates the buffer with each read, which is pretty slow.

And use CODE tags, please

[Djanvk]

thanks for the reply's.

How exactly does it know to separate the file at the spaces with this code?

[dargueta]

It does it automatically, because a space isn't part of a valid number. Don't worry about it at this point.