Assignment Overview

In this practice assignment, students will build a Grade Calculator that accepts student marks, validates the input, calculates total marks and percentage, assigns a grade, and displays a clear result summary.

This assignment is designed to help students combine multiple programming fundamentals in one practical mini project. Students will use input, output, variables, data types, arithmetic operators, expressions, comparison operators, logical operators, else-if ladder, nested if, and basic input validation.

Learning Objectives

After completing this assignment, students should be able to:

Prerequisites

Before attempting this assignment, students should revise the following topics:

Assignment Instructions

Build a grade calculator using language-neutral pseudocode. The program should accept marks for multiple subjects, calculate the total and percentage, assign a grade based on percentage, and display the final result.

Grade Calculator Requirements

Your grade calculator must satisfy the following requirements.

Grading Criteria

Use the following grading scale for this assignment.

Input → Process → Output Plan

Before writing pseudocode, students should understand the program using the IPO model.

Expected User Inputs

The program should read the following values:

Example Input

Student Name: Rahul
Subject 1 Marks: 80
Subject 2 Marks: 75
Subject 3 Marks: 90
Subject 4 Marks: 70
Subject 5 Marks: 85

Expected Output

----- Grade Report -----
Student Name : Rahul
Total Marks  : 400 / 500
Percentage   : 80%
Grade        : A
Status       : Pass
Message      : Excellent performance

Validation Rules

The grade calculator should validate all marks before calculating the grade.

Task 1: Write the Algorithm

Write an algorithm for building a grade calculator.

Expected Algorithm Structure

Step 1: Start
Step 2: Ask the user to enter student name
Step 3: Read student name
Step 4: Ask the user to enter marks for five subjects
Step 5: Read all five marks
Step 6: Validate that all marks are between 0 and 100
Step 7: If any mark is invalid, display error message
Step 8: If all marks are valid, calculate total marks
Step 9: Calculate percentage
Step 10: Use else-if ladder to assign grade
Step 11: Decide pass or fail status
Step 12: Display student name, total, percentage, grade, status, and message
Step 13: Stop

Task 2: Write Language-Neutral Pseudocode

Write pseudocode for the grade calculator using clear and readable steps.

Your Pseudocode Area

WRITE YOUR GRADE CALCULATOR PSEUDOCODE HERE

Task 3: Create a Trace Table

Use the following test case and complete the trace table.

Test Case

Student Name = Meera
Subject 1 = 90
Subject 2 = 85
Subject 3 = 80
Subject 4 = 75
Subject 5 = 70

Task 4: Test Your Grade Calculator

Test your program using the following test cases.

Sample Solution: Algorithm

Step 1: Start
Step 2: Declare studentName, subjectOne, subjectTwo, subjectThree, subjectFour, subjectFive
Step 3: Declare totalMarks, percentage, grade, status, and message
Step 4: Ask user to enter student name
Step 5: Read studentName
Step 6: Ask user to enter five subject marks
Step 7: Read subjectOne, subjectTwo, subjectThree, subjectFour, subjectFive
Step 8: Check whether all marks are between 0 and 100
Step 9: If any mark is invalid, display error message
Step 10: If all marks are valid, calculate totalMarks
Step 11: Calculate percentage
Step 12: If percentage is 90 or above, grade is A+
Step 13: Else if percentage is 80 or above, grade is A
Step 14: Else if percentage is 70 or above, grade is B
Step 15: Else if percentage is 60 or above, grade is C
Step 16: Else if percentage is 50 or above, grade is D
Step 17: Else if percentage is 35 or above, grade is E
Step 18: Else grade is F
Step 19: If percentage is 35 or above, status is Pass
Step 20: Otherwise status is Fail
Step 21: Display final grade report
Step 22: Stop

Sample Solution: Grade Calculator Pseudocode

/*
Practice Assignment: Grade Calculator
This program accepts marks for five subjects,
calculates total and percentage, then assigns grade.
*/

ENTRY POINT
    DECLARE studentName AS TEXT = ""

    DECLARE subjectOne AS DECIMAL = 0.0
    DECLARE subjectTwo AS DECIMAL = 0.0
    DECLARE subjectThree AS DECIMAL = 0.0
    DECLARE subjectFour AS DECIMAL = 0.0
    DECLARE subjectFive AS DECIMAL = 0.0

    DECLARE totalMarks AS DECIMAL = 0.0
    DECLARE percentage AS DECIMAL = 0.0

    DECLARE grade AS TEXT = ""
    DECLARE status AS TEXT = ""
    DECLARE message AS TEXT = ""
    DECLARE isValid AS BOOLEAN = true

    DISPLAY "----- Grade Calculator -----"

    DISPLAY "Enter student name:"
    INPUT studentName

    DISPLAY "Enter marks for subject 1:"
    INPUT subjectOne

    DISPLAY "Enter marks for subject 2:"
    INPUT subjectTwo

    DISPLAY "Enter marks for subject 3:"
    INPUT subjectThree

    DISPLAY "Enter marks for subject 4:"
    INPUT subjectFour

    DISPLAY "Enter marks for subject 5:"
    INPUT subjectFive

    IF studentName == "" THEN
        DISPLAY "Error: Student name cannot be empty"
        SET isValid = false
    END IF

    IF subjectOne < 0 OR subjectOne > 100 THEN
        DISPLAY "Error: Subject 1 marks must be between 0 and 100"
        SET isValid = false
    END IF

    IF subjectTwo < 0 OR subjectTwo > 100 THEN
        DISPLAY "Error: Subject 2 marks must be between 0 and 100"
        SET isValid = false
    END IF

    IF subjectThree < 0 OR subjectThree > 100 THEN
        DISPLAY "Error: Subject 3 marks must be between 0 and 100"
        SET isValid = false
    END IF

    IF subjectFour < 0 OR subjectFour > 100 THEN
        DISPLAY "Error: Subject 4 marks must be between 0 and 100"
        SET isValid = false
    END IF

    IF subjectFive < 0 OR subjectFive > 100 THEN
        DISPLAY "Error: Subject 5 marks must be between 0 and 100"
        SET isValid = false
    END IF

    IF isValid == true THEN
        SET totalMarks = subjectOne + subjectTwo + subjectThree + subjectFour + subjectFive
        SET percentage = totalMarks / 5

        IF percentage >= 90 THEN
            SET grade = "A+"
            SET message = "Outstanding performance"

        ELSE IF percentage >= 80 THEN
            SET grade = "A"
            SET message = "Excellent performance"

        ELSE IF percentage >= 70 THEN
            SET grade = "B"
            SET message = "Very good performance"

        ELSE IF percentage >= 60 THEN
            SET grade = "C"
            SET message = "Good performance"

        ELSE IF percentage >= 50 THEN
            SET grade = "D"
            SET message = "Average performance"

        ELSE IF percentage >= 35 THEN
            SET grade = "E"
            SET message = "Pass, but improvement needed"

        ELSE
            SET grade = "F"
            SET message = "Fail"
        END IF

        IF percentage >= 35 THEN
            SET status = "Pass"
        ELSE
            SET status = "Fail"
        END IF

        DISPLAY "----- Grade Report -----"
        DISPLAY "Student Name : " + studentName
        DISPLAY "Total Marks  : " + totalMarks + " / 500"
        DISPLAY "Percentage   : " + percentage + "%"
        DISPLAY "Grade        : " + grade
        DISPLAY "Status       : " + status
        DISPLAY "Message      : " + message
    END IF
END ENTRY POINT

Alternative Solution: Nested If for Validation

The following version first validates all marks together. Only if marks are valid does it calculate the grade.

/*
Grade Calculator using nested if for validation.
*/

ENTRY POINT
    DECLARE studentName AS TEXT = ""
    DECLARE mark1 AS DECIMAL = 0.0
    DECLARE mark2 AS DECIMAL = 0.0
    DECLARE mark3 AS DECIMAL = 0.0
    DECLARE mark4 AS DECIMAL = 0.0
    DECLARE mark5 AS DECIMAL = 0.0
    DECLARE total AS DECIMAL = 0.0
    DECLARE percentage AS DECIMAL = 0.0
    DECLARE grade AS TEXT = ""

    DISPLAY "Enter student name:"
    INPUT studentName

    DISPLAY "Enter marks for five subjects:"
    INPUT mark1
    INPUT mark2
    INPUT mark3
    INPUT mark4
    INPUT mark5

    IF mark1 >= 0 AND mark1 <= 100 AND
       mark2 >= 0 AND mark2 <= 100 AND
       mark3 >= 0 AND mark3 <= 100 AND
       mark4 >= 0 AND mark4 <= 100 AND
       mark5 >= 0 AND mark5 <= 100 THEN

        SET total = mark1 + mark2 + mark3 + mark4 + mark5
        SET percentage = total / 5

        IF percentage >= 90 THEN
            SET grade = "A+"
        ELSE IF percentage >= 80 THEN
            SET grade = "A"
        ELSE IF percentage >= 70 THEN
            SET grade = "B"
        ELSE IF percentage >= 60 THEN
            SET grade = "C"
        ELSE IF percentage >= 50 THEN
            SET grade = "D"
        ELSE IF percentage >= 35 THEN
            SET grade = "E"
        ELSE
            SET grade = "F"
        END IF

        DISPLAY "Student Name: " + studentName
        DISPLAY "Total Marks : " + total
        DISPLAY "Percentage  : " + percentage
        DISPLAY "Grade       : " + grade

    ELSE
        DISPLAY "Invalid marks. All marks must be between 0 and 100."
    END IF
END ENTRY POINT

Sample Answer: Trace Table

For the test case Meera, 90, 85, 80, 75, and 70, the trace table should look like this:

Bonus Task 1: Add Subject-Wise Result

As a bonus challenge, students can display whether the student passed or failed in each subject.

Bonus Pseudocode Idea

IF subjectOne >= 35 AND subjectTwo >= 35 AND subjectThree >= 35 AND subjectFour >= 35 AND subjectFive >= 35 THEN
    DISPLAY "Passed in all subjects"
ELSE
    DISPLAY "Failed in one or more subjects"
END IF

Bonus Task 2: Add Remarks

Students can add personalized remarks based on the grade.

Bonus Task 3: Multiple Students

Advanced students can modify the program to calculate grades for multiple students.

Common Mistakes to Avoid

Submission Checklist

Before submitting, students should verify the following:

Evaluation Rubric

The assignment can be evaluated using the following rubric.

Mini Viva Questions

Interview Questions on Grade Calculator

Quick Summary