This content originally appeared on DEV Community and was authored by Nimish Bordiya
1. Requirement Analysis
Objective: Build a simple calculator mobile/desktop app that can perform basic arithmetic operations.
Functional Requirements:
- User should be able to input two numbers.
- App should support basic operations: addition (+), subtraction (−), multiplication (×), division (÷).
- Display the result on the screen. 4.Provide a "Clear" button to reset inputs and result.
Non-Functional Requirements:
- Easy-to-use interface.
- Fast response (instant calculations).
- Should not crash for invalid inputs (e.g., division by zero).
2. Design
Wireframe / Sketch (simple UI idea):
--------------------------
| Simple Calculator |
|--------------------------|
| [ Input 1 ] |
| [ Input 2 ] |
| |
| [+] [-] [×] [÷] |
| |
| Result: [ ] |
| |
| [ Clear ] |
--------------------------
- Two input boxes for numbers.
- Four buttons for operations.
- A result box to show the answer.
- A "Clear" button.
3. Development (Pseudocode)
// Start Calculator App
BEGIN
DISPLAY "Enter first number:"
READ num1
DISPLAY "Enter second number:"
READ num2
DISPLAY "Choose operation: +, -, *, /"
READ op
IF op == "+"
result = num1 + num2
ELSE IF op == "-"
result = num1 - num2
ELSE IF op == "*"
result = num1 * num2
ELSE IF op == "/"
IF num2 == 0
DISPLAY "Error: Division by zero not allowed"
ELSE
result = num1 / num2
ENDIF
ENDIF
DISPLAY "Result = " + result
// Clear function resets num1, num2, and result
END
4. Testing Plan
Test Cases:
| Test Case ID | Input 1 | Input 2 | Operation | Expected Output | Notes |
| ------------ | ------- | ------- | --------- | ----------------------- | ----------------- |
| TC01 | 5 | 3 | + | 8 | Basic addition |
| TC02 | 10 | 4 | - | 6 | Subtraction |
| TC03 | 6 | 7 | * | 42 | Multiplication |
| TC04 | 20 | 5 | / | 4 | Division |
| TC05 | 8 | 0 | / | Error: Division by zero | Edge case |
| TC06 | A | 2 | + | Error: Invalid input | Non-numeric input |
| TC07 | 100 | 200 | - | -100 | Large numbers |
Testing Types:
- Unit Testing: Verify each function (add, subtract, multiply, divide).
- Integration Testing: Check interaction between UI and logic.
- System Testing: Ensure the entire app works smoothly.
- User Acceptance Testing (UAT): Ask real users to try for ease of use.
This content originally appeared on DEV Community and was authored by Nimish Bordiya
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Nimish Bordiya | Sciencx (2025-10-01T08:27:56+00:00) 📱 Simple Calculator App – SDLC Stages. Retrieved from https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/
" » 📱 Simple Calculator App – SDLC Stages." Nimish Bordiya | Sciencx - Wednesday October 1, 2025, https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/
HARVARDNimish Bordiya | Sciencx Wednesday October 1, 2025 » 📱 Simple Calculator App – SDLC Stages., viewed ,<https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/>
VANCOUVERNimish Bordiya | Sciencx - » 📱 Simple Calculator App – SDLC Stages. [Internet]. [Accessed ]. Available from: https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/
CHICAGO" » 📱 Simple Calculator App – SDLC Stages." Nimish Bordiya | Sciencx - Accessed . https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/
IEEE" » 📱 Simple Calculator App – SDLC Stages." Nimish Bordiya | Sciencx [Online]. Available: https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/. [Accessed: ]
rf:citation » 📱 Simple Calculator App – SDLC Stages | Nimish Bordiya | Sciencx | https://www.scien.cx/2025/10/01/%f0%9f%93%b1-simple-calculator-app-sdlc-stages/ |
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