Console Applications

Student Grade Calculator

Build a console application that calculates totals, averages, grades, and pass or fail results.

Beginner60 minutes5 features

What you will build

Create a small application that accepts student marks, validates the values, calculates the result, and displays a clearly formatted report.

Learning objectives

Clean architecture and separation of concerns
Object-Oriented Design (Classes, Structs, Enums)
Dependency Injection for testability
Immutability and data safety
Precision math and rounding (e.g., BigDecimal/Decimal)
Robust console input validation and error handling
Using modern standard libraries (Streams/Algorithms)

Prerequisites

Variables and Data Types
Control flow (If/Else, Switch, Loops)
Basic Object-Oriented Concepts (Classes or Structs)
Understanding of Functions/Methods
Basic terminal/console usage

Core requirements

Read student details: Accept the student name and five subject marks.
Validate marks: Allow marks only from 0 to 100.
Calculate result: Calculate total and average accurately.
Assign grade: Assign a grade from the calculated average.
Display report: Print a readable final result.

Project milestones

Accept input
Read the student name and five marks.
Validate the marks
Reject any value outside the allowed range.
Calculate total and average
Use suitable numeric types and avoid unintended integer division.
Assign the grade
Apply the project grade boundaries with conditional logic.
Display and test the report
Format the report and test normal and boundary values.

Sample interaction

Student Grade Calculator
Enter marks from 0 to 100 for five subjects.

Student name: Saad
English mark: 98
Mathematics mark: 98
Science mark: 87
Computer mark: 88
Social Studies mark: 85

--------------------------------------------------
              STUDENT GRADE REPORT
--------------------------------------------------
Student: Saad

Subject                         Mark
--------------------------------------------------
English                           98
Mathematics                       98
Science                           87
Computer                          88
Social Studies                    85
--------------------------------------------------
Total                            456 / 500
Average                        91.20
Grade                             A+
Result                          Pass
--------------------------------------------------

Testing checklist

Test all valid marks.
Test 0 and 100.
Test a failing mark.
Test a value below 0.
Test a value above 100.

Choose an implementation

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