Using string objects - Objective-C Essential Training Video Tutorial | LinkedIn Learning, formerly Lynda.com
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Arithmetic on Strings in Objective C: Don't use Floats — Use NSDecimalNumber! | by Brian Clouser | Medium
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What are the details of "Objective-C Literals" mentioned in the Xcode 4.4 release notes? - Stack Overflow
![SOLVED: A 3.00-kg object B is connected with a string to a 5.00-kg object A, which is connected with a second string over a massless, frictionless pulley to a 9.00-kg object C. SOLVED: A 3.00-kg object B is connected with a string to a 5.00-kg object A, which is connected with a second string over a massless, frictionless pulley to a 9.00-kg object C.](https://cdn.numerade.com/ask_previews/ae4a1c6c-2925-47e3-9e1b-cdcd26eab393_large.jpg)