Introduction

In today’s world, grade calculation is an essential part of educational systems. A Grade Calculator allows educators and students to easily calculate final grades based on individual scores. This program helps in automating the grading process and providing instant feedback. By entering scores for various subjects or assignments, the grade calculator can determine the grade based on predefined thresholds.

Objective

The objective of this program is to provide a simple and efficient way to calculate and display grades based on input scores. The program will take user input for scores, calculate the corresponding grade, and then display it. The grading criteria can be easily modified as per different educational systems.

Python Code for Grade Calculator

# Grade Calculator Program in Python

def calculate_grade(score):
    """Function to calculate grade based on score."""
    if score >= 90:
        return "A"
    elif score >= 80:
        return "B"
    elif score >= 70:
        return "C"
    elif score >= 60:
        return "D"
    else:
        return "F"

def main():
    # Input: Get user score
    score = float(input("Enter the score (0-100): "))
    
    # Validate the score
    if score < 0 or score > 100:
        print("Invalid score! Please enter a value between 0 and 100.")
        return
    
    # Calculate and display grade
    grade = calculate_grade(score)
    print(f"The grade for the score {score} is: {grade}")

if __name__ == "__main__":
    main()

Explanation of the Program Structure

The Grade Calculator program is divided into two primary components:

• calculate_grade(score): This function takes the score as input and determines the grade based on predefined thresholds. If the score is greater than or equal to 90, the grade is ‘A’, for scores 80-89 it returns ‘B’, for 70-79 it returns ‘C’, for 60-69 it returns ‘D’, and any score below 60 returns an ‘F’.
• main(): This function collects the user input (score), validates it to ensure it’s within the valid range (0-100), and then calls the calculate_grade function to get the grade. The grade is then displayed to the user.

How to Run the Program

1. Ensure you have Python installed on your system.
2. Create a Python file (e.g., grade_calculator.py) and paste the code above into this file.
3. Open your terminal or command prompt and navigate to the location where the file is saved.
4. Run the program using the command: python grade_calculator.py.
5. Enter a score when prompted, and the program will display the corresponding grade.