Input Rule:

If user enters an invalid test score $($out of range $0-100),$ the program will display an error message

and exit the program. We use integer $($type int$)$ to store each score.

Grade Conversion Rules:

Rule $1.$ If the average score is $90$ or more the grade is $\text{'}$A$\text{'}.$

Rule $2.$ If the average score is $70$ or more and less than $90$ then check the third test score. If the

third score is $90$ or more the grade is $\text{'}$A$\text{'}$ otherwise the grade is $\text{'}$B$\text{'}.$

Rule $3.$ If the average score is $50$ or more and less than $70$ then check the average of the second

and third scores. If the average of the last two scores is $70$ or more, the grade is $\text{'}$C$\text{'}$ otherwise it is

a $\text{'}$D$\text{'}$

Rule $4.$ If the average score is less than $50$ then the grade is $\text{'}$F$\text{'}.$

Rounding Rule: Midpoint rounding using casting

The grade average calculation returns a float. Round up to the next int if the fractional part is $\mathrm{.}5$

or greater, otherwise truncate the fraction by casting to an int.

The algorithm is: Add $0\mathrm{.}5$ to the average and cast the result to an int.

Example: average $=($int$)($average $+0\mathrm{.}5)$

average$2=($int$)($average$2+0\mathrm{.}5)$

$***$ do not use round$()$ function

$***$ rounding rule applies to both average calculations $($average of $3$ scores, average of $2$ scores$).$

To Solve this problem, we can identify IPO and develop the Pseudocode.

Input Three test scores

Processing Calculate the average and convert it to letter grade according to the four

conversion rules

Output Display the average of $3$ test scores and letter grade

Variables test$\_$score$1,$ test$\_$score$2,$ test$\_$score$3$ int

average $($average of $3$ test scores$)$ float to int $($after rounding$)$

average$2($average of last $2$ test scores$)$ float to int $($after rounding$)$

letter$\_$grade $$ str

COSC$-1436$ Programming Fundamentals I $$ Python

Constants none

Pseudocode $1.$ Prompt the user to enter each test score.

$2.$ Read each input and store it into variable.

$3.$ Check to see if any test score is out of range. If it is$,$ display error message.

$**$Do not use sys$.$exit$()$ to force exiting the program.

$4.$ If all test scores are valid, calculate average, average$2$ and letter grade. $(***$ I

leave it for you to complete the calculations according to the rules above.$)$

$5.$ Display average of $3$ test scores and letter grade.

Assignment Instructions:

$1.$ Create a Python script file to perform the above tasks. Name your assignment first$\_$last$\_$a$2.$py

where first is your first name and last is your last name.

$2.$ Add comments on top of your program to document your code. Include Program description,

your name and date.

$3.$ Use the above pseudocode to help you write Python code.

$4.$ Name your variables clearly and use constants to store fixed information.

$5.$ Make sure your program is easier to read by adding comments and spaces, etc.

$6.$ Submit your python file in Canvas for grading.

$7.$ Your program grade will be based on the following criteria:

a$.$ Program code and output accuracy $70\%$

b$.$ Following program instructions for required identifiers$/$assignment file name if there

are any $15\%$

c$.$ Program documentation $10\%$

d$.$ Program output display $5\%$

$8.$ You will receive a $0$ if you copy others$$ code or let others copy your code. Please refer to

Academy Integrity in course syllabus.

$9.$ Program output: $($Use $93,81,65$ as $1$

st set of test data

Use $100,90,-60$ as $2$nd set of test data$)$