Design Critique: Calculator (iPhone Application, iOS 11.2.5 version)

The calculator application simply defined is a digital calculator. It can perform the most basic mathematical functions (such as addition/subtraction) all the way to solving more complex algebraic problems (such as logarithmic functions). For brevity, I will mainly focus upon the interface attributes that are present in the basic calculator mode (Refer to Figure 1 for images of basic and advanced calculator interfaces).

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