BIT $1400$ Assignment $3$ Summer $2024$

Let$$s see if we can do something similar to A$2$ so everyone feels more comfortable with C programming

and algorithmic thinking. In this assignment you will:

$1.$ Begin thinking about code reuse and identifying why functions can be useful.

$2.$ Demonstrate the ability to write syntactically and logically correct C code for math operations.

$3.$ Compose logically sound and unambiguous pseudocode for a real world calculation problem.

Part $1$: Pseudocode

Submit a pseudocode solution for finding $$concern$$ students in BIT $1400$ if all students and their grades

were written in an excel spreadsheet $($ie a big grid of students and their grades$).$ On each row of the

spreadsheet is a student$$s information. Columns in the table will be student name, assignment $1$ grades

$(\%),$ assignment $2$ grades $(\%),$ and $4$ lab attendance grades $($listed as true$/$false$).$ For each subroutine,

just refer to it and define later.

A student is considered a $$concern$$ student if they didn$$t attend at least $3$ of the $4$ labs so far and didn$$t

pass both assignment $1$ and assignment $2.$

Make sure you define any subroutines you write.

Pseudocode will be loosely defined as any algorithmic $($and non$-$ambiguous$)$ set of instructions that are

performed one after the other. Therefore, flow charts and step$-$by$-$step instructions would both count.

If some part of the task is ambiguous either, ask or clearly state the assumptions you are making.

If you write your instructions on paper, take clear easy$-$to$-$read photos and put them all into a single pdf

file. If you write the pseudocode on a computer $($I don$$t recommend this without a digital pen, but it is

your choice$)$ then make a pdf of your work. Submit this pdf file to Brightspace.

Part $2$: Variables and basic functions

This assignment is still attempting to $$ease you in$$ to programming in C

If you programmed before; don$$t worry. The problems are about to be more challenging. In the

meantime, you should solve these problems using $($reusable$)$ functions for a bit more of a challenge

$($experienced programmers ONLY$).$ If A$2$ was too hard, hopefully this will restore some confidence.

Make a new project with a single $.$cpp file titled A$3\_.$cpp$,$ where is your first

initial and last name. Put a main method in the $.$cpp file.

In the main method, make a new constant $($const$)$ double variable named MY$\_$PI$.$ MY$\_$PI should be

equal to $3\mathrm{.}14159.$

Make two variables $($double data type$)$ named radius and diameter. Set the diameter to $2$ and radius is

always diameter $/2.$

$$ To test your code, you can modify the value of radius and make sure your code works for

different values.

$$ Set the value back to $2$ before submitting your work but write comments stating the values you

tested and the results you got.

Area of a Circle:

Make a variable areaCircle $($a double$)$ and calculate the area of a circle with the given radius $($the

variable above$).$ Recall that the area of a circle is pi $*$ r$2$ but there is no need for a square function. You

just need $*$ for multiply.

Use printf to write a message about the area of the circle.

Volume of a Cylinder:

When calculating the volume of a cylinder, we will make the height of the cylinder equal to the

diameter.

You should test that the cylinder volume calculation works for multiple different diameters.

Make a variable volumeCyl $($double$)$ that stores the volume of a cylinder.

Use printf to write a message about the volume of the cylinder.

Volume of a cylinder $($intro to functions$)$: Notice how much nicer it would be if we just wrote the area of

a circle code just once?

Incorrect Volume

Try to calculate the volume of a sphere with integers only: $4/3*$ pi $*$ r $*$ r $*$ r

To make sure each number is an integer and NOT a double or float, you can put $($int$)$ in front of each

non$-$integer. Something like:

int sphereVol $=4/3*($int$)$ MY$\_$PI $*($int$)$radius $*($int$)$ radius $*($int$)$ radius;

Next, calculate sphereVol$2$ as the correct calculation but cast the final number to be an int. That would

look something like:

int sphereVol$2=($int$)(4/3*$ MY$\_$PI$.......)$;

Calculate sphereVol$3$ which CORRECTLY calculates the volume of the sphere. SphereVol$3$ should be a

double.

Finally, using printf statements to output the values $($and meaningful messages$)$ of sphereVol,

sphereVol$2,$ and sphereVol$3.$

Printf is a function that lets you output messages to the screen. It has a format like this:

printf$($Some message to output $\%$i$,$ myVal$)$;

Let$$s say myVal was $4,$ the message $$Some message to output $4$ would appear in the output window.

Recall that $\%$f is for floats and doubles while $\%$i and $\%$d are for integer digits. Please see the lab TAs for

help if you are confused. You may also look at assignment $2$ for help.

Also note:

in the text message makes a new line. Therefore

printf$($Some message to output

$\%$i

$,3)$;

outputs

Some message to output

$3$

Calculating Cube Volume

Finally calculate the volume of a cube with dimensions $$diameter$$ x $$diameter$$ x $$diameter$$ where

$$diameter$$ is the diameter variable you made at the start of t