Use functional decomposition to solve this problem and implement the solution in

C$++.$ That is$,$ implement your solution using functions.

The problem to solve is to read a test score value from the keyboard and then

calculate and display grade based on the score entered.

There should be a function called printInfo$()$ to display basic information about

the program. This function has this prototype:

void printInfo$()$

Testing: You should test only this function from your main$()$ function to make sure

it works before proceed.

Add pre$-$conditions and post$-$conditions documentation to your function.

There should also be a function called getScore$()$ to read test score value from

the keyboard. This function must validate that test score accepted must be in the

range from $0$ to $100.$ Any other value should display an error message and prompt

user to enter another score value. Function will return only a valid score value.

This getScore$()$ function will have the following prototype.

int getScore$()$;

Testing: You should test only this getScore$()$ function from your main$()$ function

to make sure it works before proceed.

You should print the test score returned $($in your main$()$ function$)$ and make sure

you get the correct value enter in the getScore$()$ function.

Add pre$-$conditions and post$-$conditions documentation to your function.

There should be a function called findGrade$()$ that will receive the valid test

score value and then figure out the correct grade and return it to the caller. This

function has this prototype:

char findGrade$($int$)$;

The grade will be set according to this table.

Test Score Grade

$90100$ A

$8089$ B

$7079$ C

$6069$ D

$059$ F

Note: That you don$$t need to worry about invalid grade because only valid scores

are coming to this function.

Add pre$-$conditions and post$-$conditions documentation to your function.

Testing: You should test only this findGrade$()$ function from your main$()$ function

to make sure it works before proceed.

Lastly, there should be a void function printInfo$()$ that will accept the score and

grade and then print them out.

This function will have this prototype:

void printInfo$($int$,$char$)$;

Add pre$-$conditions and post$-$conditions documentation to your function.

Remember to use meaningful names for your variables.