Common Arithmetic Operators (OCR GCSE Computer Science): Revision Note

Python code

# -----------------------------------------------------------------------
# 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

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

print("Your score is:", score)