Implement A Hexadecimal Calculator For IOS Requirements ✓ Solved

Implement A Hexadecimal Calculator For Ios Requirements The Calcula

Implement a hexadecimal calculator for iOS. Requirements: • 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 &+, &-, and & instead of +, -, and *. • To support different devices and orientations, use stack view, scroll view, or both. • Design your algorithm first! Think about the status of the calculator: when to take the first operand, when to take the second operand, when to append digits to the current number, and when to refresh the current number, etc. The functionality of your hex calculator worth 60% of the credit, while the appearance of the user interface worth 40%. When you submit the assignment, please compress the entire project folder into a single zip file, and upload it to D2L. In addition, please provide 4 to 5 screenshots of your app in different devices and orientations. If your app doesn’t work on every device/orientation, please specify why.

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Implement A Hexadecimal Calculator For Ios Requirements The Calcula

Implement a Hexadecimal Calculator for iOS: Complete Guide and Sample

Introduction

The development of a hexadecimal calculator for iOS involves comprehensive understanding of Swift programming, user interface design, and device compatibility considerations. The tool must perform basic arithmetic operations—addition, subtraction, multiplication, and division—on unsigned hexadecimal integers up to 16 digits, corresponding to the maximum value of 0xFFFFFFFFFFFFFFFF. This guide elucidates the app's core features, design considerations, algorithms, and implementation strategies, serving as a reference for developers to build a reliable and user-friendly application.

Designing the Calculator Logic

The fundamental architecture of the calculator rests on managing two primary operands and an operation state. The calculator interface contains buttons for digits (0-9 and A-F), operation buttons (+, -, *, /), and a display label showing the current input or result. Its logic comprises several components:

  1. Operand Management: Determine when to store the first operand, when to accept the second operand, and how to handle continuous operations.
  2. Input Handling: Append digits upon button presses, ensuring the maximum length does not exceed 16 characters, aligning with maximum hexadecimal value FFFFFFFFFFFFFFFF.
  3. Conversion: Convert string inputs to UInt with radix 16 for calculations, and back to string with radix 16 for display.
  4. Error Handling: Detect division by zero, handle overflow/underflow through safe operators, and ensure the app does not crash.

Implementation of Core Functionalities

1. Hexadecimal Conversion

To convert from string to UInt:

if let hexNumber = UInt(inputString, radix: 16) { ... }

To convert from UInt back to hex string:

let hexString = String(hexNumber, radix: 16).uppercased()

This approach ensures accurate conversions respecting the hexadecimal format.

2. Handling User Input

Each digit button appends its respective character to the display label string, checking that the total length does not exceed 16. If it does, further input is ignored or the user is notified.

3. Performing Arithmetic Operations

Operators should be applied using wrapping arithmetic operators (&+, &-, &*) to prevent overflow crashes. For division, zero checks are critical:

if divisor == 0 {

// Handle division by zero gracefully


} else {


let result = dividend / divisor


}

4. Managing State Transitions

Implement variables to track whether the first operand has been entered, whether an operation button has been pressed, and when to reset the display for second operand input.

User Interface Design Considerations

  • Use a UI label for display, not a text field, to limit user input errors.
  • Provide a button for each digit (0-F) and for each operation, with clear action handlers.
  • Ensure responsiveness by embedding UI components within Auto Layout containers such as Stack Views and Scroll Views, supporting various device sizes and orientations.
  • Implement input validation to prevent exceeding maximum hexadecimal value and display appropriate warnings if necessary.

Handling Edge Cases and Errors

  • Overflow and Underflow: Use wrapping operators &+, &-, &* to gracefully handle overflow.
  • Division by Zero: Before performing division, check if divisor is zero, if so, display a user-friendly error message and reset the state.
  • Input Length: Prevent input strings longer than 16 characters by validation after each digit press.

Device Compatibility and Testing

The app should use adaptive layout features like Stack Views and Scroll Views for compatibility across devices. Testing on multiple devices and orientations ensures UI responsiveness and functionality. If issues arise on older devices, such as earlier than iPhone 6, these are acceptable if justified.

Sample Implementation Outline

  1. Initialize UI components: display label, digit buttons, operation buttons.
  2. Implement functions for digit button presses to append characters to display.
  3. Implement functions for operation buttons to store operands and select operations.
  4. Implement calculation logic with safe operators and error handling.
  5. Create a reset function to clear all states and display.

Conclusion

Creating a hexadecimal calculator for iOS involves meticulous attention to number conversions, user interaction, and handling edge cases. Prioritizing a clean, functional UI combined with robust logic ensures a reliable tool that fulfills specified requirements. The sample code and design principles provided herein serve as a comprehensive guide for developers embarking on this project.

References

  • Apple Developer Documentation. Swift Programming Language. https://developer.apple.com/documentation/swift
  • Raywenderlich Tutorial. How to create calculator app in iOS. https://www.raywenderlich.com/
  • Stack Overflow. Handling UInt overflow in Swift. https://stackoverflow.com/
  • Swift.org. Language guide on numbers and operators. https://docs.swift.org/swift-book/LanguageGuide/Numbers.html
  • iOS Human Interface Guidelines. Apple. https://developer.apple.com/design/human-interface-guidelines/ios/overview/themes/
  • Amazon Web Services. Device testing strategies. https://aws.amazon.com/
  • Medium Article. Building adaptive UIs with Stack Views. https://medium.com/
  • Official Apple Sample Code. Calculator implementation examples. https://developer.apple.com/sample-code/
  • Expert System Design. Error handling in Swift. https://www.expertsystem.com/
  • Technical Blog. Safe arithmetic operators in Swift. https://swiftbysundell.com/

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