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Python Programs - Conditional Statements

Determine grade based on marks - Python Program

Example 1 :

Python 

marks = int(input("Enter marks: "))

if marks >= 90:
    grade = 'A'
elif marks >= 75:
    grade = 'B'
elif marks >= 60:
    grade = 'C'
elif marks >= 40:
    grade = 'D'
else:
    grade = 'F'

print("Grade:", grade)

Output

 
OUTPUT  :
Enter marks: 82
Grade: B

Example 2 :

Python 

 
 def get_grade(marks):
    """
    Determines the letter grade based on numerical marks.

    Args:
        marks (float): The numerical marks obtained by the student.

    Returns:
        str: The corresponding letter grade.
    """
    if marks >= 90:
        return 'A'
    elif marks >= 80:
        return 'B'
    elif marks >= 70:
        return 'C'
    elif marks >= 60:
        return 'D'
    else:
        return 'F'

# Get marks input from the user
try:
    student_marks = float(input("Enter the student's marks (0-100): "))
    if not (0 <= student_marks <= 100):
        print("Invalid input: Marks must be between 0 and 100.")
    else:
        # Determine and print the grade
        grade = get_grade(student_marks)
        print(f"The student's marks are: {student_marks}")
        print(f"The student's grade is: {grade}")
except ValueError:
    print("Invalid input: Please enter a numerical value for marks.")

Output

 
OUTPUT  :
Enter the student's marks (0-100): 85
The student's marks are: 85.0
The student's grade is: B

Explanation

This program defines a function get_grade that takes a student's numerical marks as input and returns a letter grade based on a predefined grading scale. The if-elif-else structure is used to evaluate the marks against different thresholds:

  • Marks 90 or above receive an 'A'.
  • Marks between 80 and 89 (inclusive) receive a 'B'.
  • Marks between 70 and 79 (inclusive) receive a 'C'.
  • Marks between 60 and 69 (inclusive) receive a 'D'.
  • Marks below 60 receive an 'F'.

The program then prompts the user to enter the student's marks, converts the input to a float, and includes error handling using a try-except block to catch ValueError if non-numerical input is provided. It also validates that the entered marks are within the expected range of 0 to 100. Finally, it calls the get_grade function and prints both the entered marks and the determined grade.

 

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