CSCI 200 - Fall 2024
Foundational Programming Concepts & Design

This lab is due by Monday, September 23, 2024, Before Class.
As with all labs you may, and are encouraged, to pair program a solution to this lab. If you choose to pair program a solution, be sure that you individually understand how to generate the correct solution.

Jump To: Rubric Submission

Pass-by-Value & Pass-by-Pointer

One of the limitations of functions is that they can only return a single value. A workaround to this limitation is to pass parameters by pointer. When the function completes, the arguments corresponding to these parameters will contain the modified values. A generic function prototype would match the following template:

void function_name( const dataType IN_PARAM_1, const dataType IN_PARAM_2, // input to the function
                    dataType* pOutParam1, dataType* pOutParam2 );         // output from the function

This usage of constant pass-by-value input and pass-by-pointer output reinforces the procedural programming style.

int value1, value2, value3, value4;              // no variables are initialized
cin >> value1 >> value2;                         // user enters value1 and value2
function_name(value1, value2, &value3, &value4); // function call populates value3 and value4
cout << value1 << " " << value2 << endl;         // all variables now have a value
cout << value3 << " " << value4 << endl;         // all variables now have a value

Instructions

We will create two functions called polar_to_cartesian and cartesian_to_polar that match the above format. Begin by reviewing the Polar to Cartesian Conversion equations.

Your program should first prompt the user which direction they wish to convert, either

Prompt the user to input the values on the left hand side and then call the corresponding function to compute the values on the right hand side. Display these resultant values to the user.

Your functions must match the following specifications:

1. • Function Name: polar_to_cartesian
   • Input:
     1. double passed by constant value corresponding to the radius
     2. double passed by constant value corresponding to the angle
     3. double passed by pointer corresponding to the xCoordinate
     4. double passed by pointer corresponding to the yCoordinate
   • Output: None
   • Description: Converts polar (r, θ) to cartesian (x, y).
   
   
2. • Function Name: cartesian_to_polar
   • Input:
     1. double passed by constant value corresponding to the xCoordinate
     2. double passed by constant value corresponding to the yCoordinate
     3. double passed by pointer corresponding to the radius
     4. double passed by pointer corresponding to the angle
   • Output: None
   • Description: Converts cartesian (x, y) to polar (r, θ).
   
   

Refactor To Multiple Files

Once your solution is working, refactor your code to use multiple files. Your project should consist of the following files with respective contents:

• coordinate_conversion.h: Contains the function declarations
• coordinate_conversion.cpp: Contains the function definitions
• main.cpp: Contains all the User I/O and function calls

Be sure to update your Makefile appropriately to work with the additional files.

Grading Rubric

Your submission will be graded according to the following rubric:

Lab Submission

Always, always, ALWAYS update the header comments at the top of your main.cpp file. And if you ever get stuck, remember that there is LOTS of help available.

Zip together your coordinate_conversion.h, coordinate_conversion.cpp, main.cpp, Makefile file(s) and name the zip file L2C.zip. Upload this zip file to Canvas under L2C.

This lab is due by Monday, September 23, 2024, Before Class.
As with all labs you may, and are encouraged, to pair program a solution to this lab. If you choose to pair program a solution, be sure that you individually understand how to generate the correct solution.