Arithmetic, Logical & Boolean Operators (Cambridge (CIE) O Level Computer Science)

Addition

+

+

Subtraction

-

-

Multiplication

*

*

Division

/

/

Modulus (remainder after division)

MOD

%

Quotient (whole number division)

DIV

//

Exponentiation (to the power of)

^

**

# -----------------------------------------------------------------------
# Arithmetic operators #1
# -----------------------------------------------------------------------
# Get the user to input a number
user_input = int(input("Enter a number: "))

# If the remainder of the number divided by 2 is 0, the number is even
if user_input % 2 == 0:
    print("The number is even.")
else:
    print("The number is odd.")


# -----------------------------------------------------------------------
# Arithmetic operators #2
# -----------------------------------------------------------------------
# Get the radius from the user
radius = float(input("Enter the radius of the circle: "))

# Calculate the area of the circle
area = 3.14159 * radius ** 2

# Display the calculated area
print("The area of the circle with radius", radius, "is", area)


# ------------------------------------------------------------------------
# Arithmetic operators #3
# ------------------------------------------------------------------------
# Set the score to 0
score = 0

# Loop 5 times
for x in range(5):
    num1 = int(input("Enter the first number: "))
    operator = input("Enter the operator (+, -, *): ")
    num2 = int(input("Enter the second number: "))
    user_answer = int(input("What is " + str(num1) + " " + str(operator) + " " + str(num2) + "? "))

    # Check the answer and update the score
    if operator == '+':
        correct_answer = num1 + num2
    elif operator == '-':
        correct_answer = num1 - num2
    elif operator == '*':
        correct_answer = num1 * num2
    else:
        print("Invalid operator!")
        continue

    if user_answer == correct_answer:
        score = score + 1
    else:
        print("Sorry, that's incorrect.")

# Display the final score
print("Your score is:", score)

Equal to

==

==

Not equal to

<>

!=

Less than

<

<

Less than or equal to

<=

<=

Greater than

>

>

Greater than or equal to

>=

>=

# -----------------------------------------------------------
# Common Boolean operators #1
# -----------------------------------------------------------
# Assign a Boolean value to a and b
a = True
b = False

# Print the result of a and b
print("a and b:", a and b)
# Print the result of a or b
print("a or b:", a or b)
# Print the result of not a
print("not a:", not a)


# -----------------------------------------------------------
# Common Boolean operators #2
# -----------------------------------------------------------
# Take input for the score from the user
score = int(input("Enter the score: "))

# Compare the score and output the corresponding grade
if score >= 90 and score <= 100:
    print("Grade: A")
elif score >= 80 and score < 90:
    print("Grade: B")
elif score >= 70 and score < 80:
    print("Grade: C")
elif score < 70:
    print("Fail")


# -----------------------------------------------------------
# Common Boolean operators #3
# -----------------------------------------------------------
# Open the file for reading
try:
    file = open("scores.txt", "r")
    
    # Set flags to false
    end_of_file = False
    found = False
    score = input("Enter a score: ")

    # While it's not the end of the file and the score has not been found
    while not end_of_file and not found:
        # Read the line
        scores = file.readline().strip()

        # If the line equals the score
        if score == str(scores):
            found = True
            print("Score found")
        
        # If the line is empty (i.e., end of file)
        if scores == "":
            end_of_file = True
            if not found:
                print("Score not found")
    
    # Close the file after reading
    file.close()

except FileNotFoundError:
    print("The file 'scores.txt' was not found.")