Lab $3$: Grade Calculator Program

Objective

The objective of this lab is to develop a C$++$ program that allows users to enter grades and prints out to

the console the corresponding letter grades.

Learning Outcomes

By the end of this lab, students will be able to:

$1.$ Use do$..$while loops to repeatedly execute a block of code.

$2.$ Implement if$-$else statements to make decisions based on user input.

$3.$ Validate user input to ensure it falls within a specified range.

$4.$ Develop a complete C$++$ program from scratch.

Program Requirements

$$ The program should prompt the user to enter a grade between $0$ and $100.$

$$ Grades can be integers or decimal numbers.

$$ The program must check if the entered grade is within the acceptable range $(0-100).$ If not, it

should inform the user and prompt for a valid grade.

$$ Based on the entered grade, the program should determine and print the corresponding letter

grade following this scheme:

o A: $90-100$

o B: $80-89$

o C: $70-79$

o D: $60-69$

o F: $0-59$

$$ The program should allow the user to enter multiple grades using a do$..$while loop. After each

grade entry, the program should ask the user if they want to enter another grade.

$$ The program should provide clear feedback to the user, including the letter grade and any error

messages for invalid input.

Example Output

Enter a grade $(0-100)$: $85$

Letter grade: B

Do you want to enter another grade? $($y$/$n$)$: y

Enter a grade $(0-100)$: $105$

Invalid grade. Please enter a grade between $0$ and $100.$

Do you want to enter another grade? $($y$/$n$)$: y

Enter a grade $(0-100)$: $55\mathrm{.}75$

Letter grade: F

Do you want to enter another grade? $($y$/$n$)$: n

Thank you for using the grade calculator!

Submission

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

Evaluation Criteria

$$ Correct use of do$..$while loops and if$-$else statements.

$$ Proper input validation to ensure grades are within the range of $0-100.$

$$ Accurate determination and display of letter grades.

$$ Code readability and proper commenting.

Tips

$$ Test your program with various inputs to ensure it handles all edge cases.

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

Lab $3$: Grade Calculator Program

Objective

The objective of this lab is to develop a C$++$ program that allows users to enter grades and prints out to

the console the corresponding letter grades.

Learning Outcomes

By the end of this lab, students will be able to:

Use do$..$while loops to repeatedly execute a block of code.

Implement if$-$else statements to make decisions based on user input.

Validate user input to ensure it falls within a specified range.

Develop a complete C$++$ program from scratch.

Program Requirements

The program should prompt the user to enter a grade between $0$ and $100.$

Grades can be integers or decimal numbers.

The program must check if the entered grade is within the acceptable range $(0-100).$ If not, it

should inform the user and prompt for a valid grade.

Based on the entered grade, the program should determine and print the corresponding letter

grade following this scheme:

A: $90-100$

B: $80-89$

C: $70-79$

D: $60-69$

F: $0-59$

The program should allow the user to enter multiple grades using a do$..$ while loop. After each

grade entry, the program should ask the user if they want to enter another grade.

The program should provide clear feedback to the user, including the letter grade and any error

messages for invalid input.

Example Output

Enter a grade $(0-100)$: $85$

Letter grade: B

Do you want to enter another grade? $(\frac{y}{n})$:$y$

Enter a grade $(0-100)$: $105$

Invalid grade. Please enter a grade between $0$ and $100.$

Do you want to enter another grade? $(\frac{y}{n})$:$y$

Enter a grade $(0-100)$: $55\mathrm{.}75$

Letter grade: F

Do you want to enter another grade? $(\frac{y}{n})$:$n$

Thank you for using the grade calculator!