#   compute grade point

def get_grade_point_if_elif(grade):
    """Computes grade point using an if/elif/else chain."""
    grade = grade.upper() # Standardize input to uppercase
    if grade == "A":
        return 4.000
    elif grade == "A-":
        return 3.667
    elif grade == "B+":
        return 3.333
    elif grade == "B":
        return 3.000
    elif grade == "B-":
        return 2.667
    elif grade == "C+":
        return 2.333
    elif grade == "C":
        return 2.000
    elif grade == "C-":
        return 1.667
    elif grade == "D+":
        return 1.333
    elif grade == "D":
        return 1.000
    elif grade == "D-":
        return 0.667
    elif grade == "F":
        return 0.000
    else:
        return "Invalid Grade"

# Example usage
print(f"Grade A- has {get_grade_point_if_elif('A-')} grade point.")
print(f"Grade F has {get_grade_point_if_elif('F')} grade point.")
print(f"Grade Z has {get_grade_point_if_elif('Z')} grade point.")

def get_grade_point_nested_if(grade):
    """Computes grade point using nested if/else statements."""
    grade = grade.upper()
    if grade[0] == "A":
        if len(grade) == 2 and grade[1] == "-":
            return 3.667
        else:
            return 4.000
    elif grade[0] == "B":
        if len(grade) == 2:
            if grade[1] == "+":
                return 3.333
            elif grade[1] == "-":
                return 2.667
        return 3.000
    elif grade[0] == "C":
        if len(grade) == 2:
            if grade[1] == "+":
                return 2.333
            elif grade[1] == "-":
                return 1.667
        return 2.000
    elif grade[0] == "D":
        if len(grade) == 2:
            if grade[1] == "+":
                return 1.333
            elif grade[1] == "-":
                return 0.667
        return 1.000
    elif grade == "F":
        return 0.000
    else:
        return "Invalid Grade"

# Example usage
print(f"Grade C+ has {get_grade_point_nested_if('C+')} grade point.")
print(f"Grade B- has {get_grade_point_nested_if('B-')} grade point.")
print(f"Grade A has {get_grade_point_nested_if('A')} grade point.")

def get_grade_point_dict(grade):
    """Computes grade point using a dictionary lookup."""
    grade_map = {
        "A": 4.000,
        "A-": 3.667,
        "B+": 3.333,
        "B": 3.000,
        "B-": 2.667,
        "C+": 2.333,
        "C": 2.000,
        "C-": 1.667,
        "D+": 1.333,
        "D": 1.000,
        "D-": 0.667,
        "F": 0.000,
    }
    # .get() provides a default value if the key is not found
    return grade_map.get(grade.upper(), "Invalid Grade")

# Example usage
print(f"Grade B+ has {get_grade_point_dict('B+')} grade point.")
print(f"Grade C has {get_grade_point_dict('c')} grade point.")
print(f"Grade E has {get_grade_point_dict('E')} grade point.")