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In the [[Working with Variables and Constants in Objective-C|previous chapters]] we looked at using variables and constants in Objective-C and also described the different data types. Being able to create variables is only part of the story however. The next step is to learn how to use these variables and constants in Objective-C code. The primary method for working with data is in the form of ''expressions''. In this chapter we will look in detail at Objective-C expressions and operators.