One thing you will find you need to do in any programming language is do math. Here are some useful math functions for the Objective C language. I give a little bit of a comparison to Visual Basic for those who know that language. They are provided in no special order:
fabs() – Gets the absolute value of the value in parentheses. Works like ABS() function in Visual Basic. fabs(-123) = 123, fabs(34) = 34.
ceil() – Find the ceiling integer. Kind of like rounding up. Same as INT(x+1) in Visual Basic. ceil(3.1) = 4.
floor() – Find the floor integer. Kind of like rounding down. Same as INT(x) in Visual Basic. floor(3.6) = 3.
exp() – Find the exponential value.
pow() – Raise a number to the power. pow(3,6) = 3^6 in Visual Basic.
rand() – Generate a pseudo random number. Function is RND(x) in Visual Basic. A good discussion on random numbers in Objective C can be found here.
srandom() – Generate a seed for the random number generator. This is done with the Randomize statement in Visual Basic.
sqrt() – Find out the square root of a number. sqrt(x) = x^(1/2) in Visual Basic.
Power Users and Developers: Making customized Apps Using Microsoft Office
Those of us who have the responsibility of producing customized Excel workbooks, and Word documents that essentially have become small powerful applications in their own right are always looking for ways to make the tools we build in these Microsoft Office products more powerful, easy to use, and more like actual stand-alone apps. One of the ways I looked at enhancing the “tools” I created was by adding a tool bar to an Excel workbook for example. I first did this myself in Excel 2003. It was tedious but doable. One draw-back in the way tool bars were done back then is that the changes applied to the whole app (Excel or Word), and one screw-up on your part could truly clobber Excel or Word’s tool bars and menus system wide.
A New Way of Doing Tool Bars in Office 2007
In Office 2007, Microsoft changed how their user interface worked. And they changed the scope of the changes. If you were going to screw something up for your tool bars now it would only be with one document file, not the entire system. Customizing this tool bar was more flexible. You could do much more with the new tool bar than the old version (the new tool bar Microsoft calls a ribbon). The Technology behind the ribbon they call RibbonX. Read more
This video is great! A band of talented musicians whose instruments are only iPads and iPhones:
I am amazed at how creatively musicians from North Point Community Church use these devices… picking specific apps for different instruments, and the creativity of the app developers who dreamed them up. Just cool!
The musicians needed to practice a bit more on the middle song, but the first and the last songs were very polished and professional.
This is a guest post from Monica Lewers, who for the past few months has been my personal trainer. Her clients keep signing up with her again and again. For one reason: she gets results. In this article she provides some tips on how to not “fall off the wagon” and stay healthly when you are traveling.
In this article I cover how you can fix the Base SDK Missing problem you might have had using the iOS SDK 5.2. The video above is easiest to see in full screen mode.
I downloaded Apple’s iOS SDK 5.2 and installed it on my Mac. After that process was over , I decided to load an existing project of mine into XCode. Ok, good. Then I tried to do a build. Kaboom! It did not work! No worries I thought, I will just go to the drop-down and pick the latest SDK 5.2. But the option was not there! The thought came to me that I might have to create a new project and import all my files from my existing project just to get it to work. Not a very nice thought to say the least! Read more
If you have ever been to Chomer.com before, and now have come back, you will notice that things look a lot different. I’m not done with this spiff-up by any means, but it is well along the way. I think that visually it is a big improvement. Also I am using a Like button for Facebook on posts, and a Retweet button for Twitter. So I’m beginning to get some of the social aspects covered too. Why the social aspects? Its a good way for people to spread the word about content on this site if they find it useful. Read more
As I began refining some sample code for making Universal Apps for the iPhone and iPad, I sought a way to make my code as concise as possible. I needed to determine if the app was running on an iPad or iPhone/iPod Touch and use it to my advantage. This basic information is contained in the UIDevice class.