Linux Format forums

[Judda]

Been Ubuntu user for a long while now and I'd thought I'd have a good at learning to program (no previous experience). So I bought the recent special edition "Paul Hudson's Coding Academy".

Fell at the first hurdle

Having trouble with homework(1/3) on Project One. Done 2 & 3 with ease.

How would I count the number of items (it's a to do list) I have in an array (single dim) as I need to print out their total?

Any help/suggestions welcome and appreciated.

[ollie]

You may find C# Count Array Elements useful, it is only a new posting.

HTH

[Judda]

Thanks Ollie I'll have a look.

[Judda]

I've just had a read and that's too advanced for what is expected for Project1.

Here is the code:

using System;
using System.IO;

namespace ToDoList
{
class MainClass
{
public static void Main(string[] args)
{
if (args.Length == 0) {
Console.WriteLine("Usage: list | add <item> | del <num>");
return;
}

if (args[0] == "add") {
File.AppendAllText("todo.txt", args[1] + "\n");
} else if (args[0] == "del") {
var contents = File.ReadAllLines("todo.txt");
File.Delete("todo.txt");

var counter = 1;
var deleteme = int.Parse(args[1]);

foreach(var item in contents) {
if (counter != deleteme) {
File.AppendAllText("todo.txt", item + "\n");
}

counter++;
}
} else {
var contents = File.ReadAllLines("todo.txt");
var counter = 1;

foreach(var item in contents) {
Console.WriteLine(counter + ": " + item);
counter++;
}
}
}
}
}

I was thinking is there any way to just take the value of the counter when it finishes as this will have counted the items?

P.S. sorry it won't stay indented

[pasti]

Hello

I just got the Lxf special edition "coding Academy", but I'm stuck at the first project although I don't seem to be the only person who is, one of my problems is with the first command you have to enter into the terminal:-

cd ToDoList/ToDoList/bin/Debug

when I hit enter all I get is "no such file or directory"

And when I enter this line:-

echo Meh > todo.txt

nothing at all happens, just a blinking cursor next to my name

then I get completely stuck, both from the magazine & the online tutorial, especially the part where it says you have to change the line "using System" to "using System.IO;", I mean do you delete the first line, add another line, spacing or what?,
anyway where do I enter:-

var contents = File.ReadAllText("todo.txt");

as in the magazine it doesn't tell you, but online it says this:

"Put that into your program just before the Console.WriteLine() line; we'll be using it soon.",
but there aren't any screenshots or anything, And I really feel cheated out of £10, I didn't need the dvd I use ubuntu, and there seems to be more info for free in the online version, all in all feel very frustrated, and as I said a little bit cheated

[Ram]

[pasti]

ram

thanks for the reply, I'm still hopelessly lost however, I don't have an "hudzilla" directory anywhere, I'm not using the "live" dvd, just my install of karmic with monodevelop, I know where mono has created the directory, but it hasn't created a text file anywhere in it, I've gone through both the magazine instructions & the online tutorial and still get the same problem, I just don't know what to do next, the instructions aren't exactly newbie programmer friendly, I say that as I'm not new to linux, ah well!

[Ram]

As you not a linux newbie then you should that echo Meh > todo.txt will create a file in the current directory that your terminal is using. echo is a stand unix command to display something usually on screen, in this case it's used with > which redirects it from the screen to a file, so it echos Meh to a file call todo.txt. If the file did not exist it would create it.

to test. open a terminal and do the following

[Ram]

[compo]

[quote="pasti"]Hello

I just got the Lxf special edition "coding Academy", but I'm stuck at the first project although I don't seem to be the only person who is, one of my problems is with the first command you have to enter into the terminal:-

cd ToDoList/ToDoList/bin/Debug

when I hit enter all I get is "no such file or directory"

Hi pasti,

The files are stored in a folder/directory called "Projects" in your home directory. The command in the magazine should read:-

cd Project/TodoList/ToDoList/bin/Debug

It took me a while to discover this. I know everyone makes mistakes but if your trying to teach someone to write code little things like that can really put you off.

compo

[Judda]

[branmask]

Hello,

I'm having trouble actually deleting something from the file. When I try running the del 1(or 2 or 3) command I get this error message:

Unhandled Exception: System.IO.FileNotFoundException: Could not find file "/home/.../Projects/ToDoList/ToDoList/bin/Debug/todo.txt.".
File name: '/home/.../Projects/ToDoList/ToDoList/bin/Debug/todo.txt.'
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x00000]
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share) [0x00000]
at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
at System.IO.File.OpenRead (System.String path) [0x00000]
at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) [0x00000]
at System.IO.StreamReader..ctor (System.String path) [0x00000]
at (wrapper remoting-invoke-with-check) System.IO.StreamReader:.ctor (string)
at System.IO.File.OpenText (System.String path) [0x00000]
at System.IO.File.ReadAllLines (System.String path) [0x00000]
at ToDoList1.MainClass.Main (System.String[] args) [0x00000]

This is my code:


if(args.Length==0){
Console.WriteLine("Usage:list|add<item>|del<num>");
return;
}
if (args[0]=="add"){
var contents=File.ReadAllLines("todo.txt");
var counter=1;
foreach(var item in contents){
Console.WriteLine(counter+":"+item);
counter++;
}
}else if(args[0]=="del"){
var contents=File.ReadAllLines("todo.txt.");
File.Delete("todo.txt");
var counter=1;
var deleteme=int.Parse(args[1]);
foreach(var item in contents){
if(counter!=deleteme){
File.AppendAllText("todo.txt",item +"\n");
}

counter++;
}
}else{
var contents=File.ReadAllLines("todo.txt");
var counter=1;

foreach(var item in contents){
Console.WriteLine(counter+":"+item);
counter++;
}

}
}
}
}

I haven't been able to figure out what I'm doing wrong as of yet. Any help would be most appreciated. Thanks

[Ram]

branmask no need to multi post.
_________________

Ubuntu LXDE 12.04 running on AMD Phenom II*4; ASUS Crosshair III Formula MB; 4 GB Ram.....

[branmask]

Ram,
"branmask no need to multi post."

sorry for the multi post! thanks for the info.