Activity $03$: Building a Calculator

Problem Statement:

You need to develop a command$-$line calculator application that can perform basic arithmetic operations like addition, subtraction, multiplication, and division.

Apply Software Development Life Cycle $($SDLC$)$ to achieve this. You need to discuss what you have to do in each stage $($analysis$,$ design, implementation, testing, maintenance$).$ Provide a documentation $($user manual$)$ on how to use the program.

Instructions:

$1.$ Requirement Analysis:

o Define the requirements for the calculator application, specifying which operations it should support.

o Create a document outlining the expected behaviour of the calculator.

$2.$ Design Phase:

o Design a user$-$friendly command$-$line interface for the calculator.

o Define functions for each arithmetic operation and their input parameters.

o You can either design an algorithm or a flowchart here.

$3.$ Implementation Phase:

o Write Python code to implement the calculator based on your design.

o Implement functions for addition, subtraction, multiplication, and division.

$4.$ Testing Phase:

o Write test cases to validate the correctness of the calculator's calculations.

o Test the calculator with various inputs to ensure it works as expected.

$5.$ Maintenance Phase:

o Consider how you will maintain this program $($i$.$e$.,$ adding more advanced features to the calculator, or handling decimals or negative numbers$).$

o Document any issues or improvements for future development