Lab $4$: Writing User Defined Functions

Objective

The objective of this lab is to write user defined functions to calculate the area of a circle and the volume

of a sphere. Additionally, you will practice writing proper preconditions and postconditions.

Requirements

$$ Write a program that asks a user to enter a radius value.

$$ Implement two user defined functions, circleArea, and sphereVolume to calculate the area of

the circle and volume of the sphere using the given radius.

$$ Use these equations for the calculations where r is the radius:

o Area of the Circle A$=$ r$2$

o Volume of the Sphere V $=4$

$3$ r$3$ Hint: Be aware of the integer division problem.

$$ The mathematical constant must be declared as a constant with the value of $3\mathrm{.}14159.$

$$ Both functions take one parameter of double type and return a double result.

$$ Write adequate preconditions and postconditions comments for both functions.

$$ The functions$$ prototypes must be declared above the main function and the definitions must be

placed below the main function.

$$ Write a main function that calls the two user defined functions.

Example Output

Submission

$$ Submit the source code file $(.$cpp$)$ to the course$$s blackboard webpage.

Evaluation Criteria

$$ Correct user defined functions implementations.

$$ Correct choice of data types.

$$ Writing proper preconditions and postconditions for all functions.

$$ Correct calculations of the area and the volume.

$$ Code readability and proper commenting.

Tips

$$ Test your program with various inputs.

$$ Use meaningful variable names and add comments to explain your code.

$$ If you encounter any issues, refer to your textbook or ask for help from your instructor or peers.

Good Lab $4$: Writing User Defined Functions

Objective

The objective of this lab is to write user defined functions to calculate the area of a circle and the volume of a sphere. Additionally, you will practice writing proper preconditions and postconditions.

Requirements

$-$ Write a program that asks a user to enter a radius value.

$-$ Implement two user defined functions, circleArea, and sphereVolume to calculate the area of the circle and volume of the sphere using the given radius.

$-$ Use these equations for the calculations where $\backslash ($ r $\backslash )$ is the radius:

$-$ Area of the Circle $\backslash ($ A$=\backslash$pi r$^\{2\}\backslash )$

$-$ The mathematical constant $\backslash (\backslash$pi $\backslash )$ must be declared as a constant with the value of $3\mathrm{.}14159.$

$-$ Both functions take one parameter of double type and return a double result.

$-$ Write adequate preconditions and postconditions comments for both functions.

$-$ The functions' prototypes must be declared above the main function and the definitions must be placed below the main function.

$-$ Write a main function that calls the two user defined functions.

Example Output

Enter the radius: $5\mathrm{.}45$

Area of the circle: $93\mathrm{.}3131$

Volume of the sphere: $678\mathrm{.}075$

Submission

$-$ Submit the source code file $(.$cpp$)$ to the course's blackboard webpage.

Evaluation Criteria

$-$ Correct user defined functions implementations.

$-$ Correct choice of data types.

$-$ Writing proper preconditions and postconditions for all functions.

$-$ Correct calculations of the area and the volume.

$-$ Code readability and proper commenting.

Tips

$-$ Test your program with various inputs.

$-$ Use meaningful variable names and add comments to explain your code.

$-$ If you encounter any issues, refer to your textbook or ask for help from your instructor or peers.