On my Day Zero List is the desire to learn to program; one of the things that people have been playing with in their down time here at Pennant Traning Systems is Project Euler:

## What is Project Euler?

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

As I am poking about more and more with the Teensy USB Development Board [my note book of sorts] (I have four now, two Teensy 2.0s and two Teensy++ 2.0) and I am looking to play a bit more with the Arduino (or Arduino Clones), and since I am more of a mac user than anything else, I probably should look at learning Objective-C.

I am already using a Teensy / Arduino microcontroler for a number of projects of mine (Accessible Keyboard and My 1st ROV) so trying to use them, and Objective-C for Project Euler could make for an interesting challenge:

### Project Euler – Problem 1 code for a Teensy:

/* Project Euler - Problem 1 If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. */ #include int loops = 1; int times = 1000; long test = 1; long result = 0; void setup() { Serial.begin(38400); delay (6000); // Give me time to start the serial consol } void loop() { if (loops < times) { // we are looking for numbers between test and times that are multiples of 3, or 5 // the %3 == 0 checks for the remainder being Zero I think; // the == Logical Same, // the || Logical OR if (test %3 == 0 || test %5 == 0) { result = result + test; Serial.println(test); } } else { Serial.println("This has either Finished, or is broken."); Serial.println("The Result is:"); Serial.println(result); delay (600000); } test++; loops++; }

Ok so it is probably not very well optimised, and could be a lot cleaner; but its a start. however importantly it gave me the correct answer.

As I progress through the Problems, my code should start to get optimised, and my maths skills should get better too.

If you do decide to learn Objective-C, you should find it pretty simple if you know the general concepts of OOP. As it is just a superset of C, the amount of actual Obj-C could fit on a small leaflet. On the other hand, Cocoa looks crazy when you first start using it – that’s where you’ll have issues.

Also; you’ll find Project Euler doesn’t help too much for learning to program, other than improving your problem solving skills. Building something of a decent size is the only way to learn that.

in your opinion how would you rate Xcode as an IDE?