# Buy SWIFT Programming Assignment

Buy SWIFT Programming Assignment
• The calculator should support 4 basic arithmetic operations: – * and /
• The calculator will operate on hexadecimal numbers, not decimal numbers
• The calculator only needs to operate on unsigned integers (i.e. UInt). You do not need to consider negative numbers or fractions.
• The calculator should support the 16-digit hexadecimal numbers (i.e. The range of the numbers is from 0 to FFFF FFFF FFFF FFFF). Prevent the user from entering a number that is greater than FFFF FFFF FFFF FFFF.
• The calculator should handle overflow and underflow gracefully. The app must not crash.
• The calculator should handle division-by-zero error gracefully. The app must not crash.
• The calculator should be able to support most of the devices and orientations. If it does not support the old devices earlier than iPhone 6, it is okay.
Hint:
• To convert a string to a hex number, use “radix: 16” as an argument. For example: var s:String? s = “1A” var intHex:UInt = 0 intHex = UInt(s!, radix: 16)! print(intHex) // shows 26 intHex = 90 s = String(intHex, radix: 16).uppercased() print(s!) // shows 5A
• It is recommended that you use a UI label instead of a text field, so that the user will not type directly by using a keyboard. You will need to provide a button for each digit.
• Strings may be concatenated by using operator. E.g. var s1 = “1234”
var s2 = “5” print(s1 s2) // shows 12345 You may want to do string concatenation in the action of each digit button.
• To prevent the user from entering a number exceeding the size of 16 digits, you may verify the length of the string associated with the UI label.
• To handle overflow and underflow, use

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550 words
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