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The following are the articles in ObjectiveC.
iPhone Expression Calculator (13687 hits) 
Posted by Prabu Arumugam on Nov252010 
Using this expressioncalculator in your iPhone, you can do advanced arithmetic calculations in a single step. No need to do multiple steps or memorize the intermediate results, for calculating the result of a single arithmetic expression. 

Blowfish Algorithm for iPhone (16568 hits) 
Posted by Prabu Arumugam on Mar232013 
This article presents the Blowfish algorithm implementation in ObjectiveC for use in iPhone/iPad projects. The project can be readily opened in Xcode and/or you can include the files in your project. 
