Program1.py

# WAP to show functionality of a basic calculator using functions.

def add(P, Q):
    # This function is used for adding two numbers
    return P + Q


def subtract(P, Q):
    # This function is used for subtracting two numbers
    return P - Q


def multiply(P, Q):
    # This function is used for multiplying two numbers
    return P * Q


def divide(P, Q):
    # This function is used for dividing two numbers
    return P / Q


# Now we will take inputs from the user
print("""Please select the operation.")
print(a. Add)
print(b. Subtract)
print(c. Multiply)
print(d. Divide""")

choice = input(
    "Please enter choice (a/ b/ c/ d): "
)

num_1 = int(
    input(
        "Please enter the first number: "
    )
)
num_2 = int(
    input(
        "Please enter the second number: "
    )
)

if choice == 'a':
    print(
        num_1, " + ", num_2, " = ",
        add(num_1, num_2)
    )

elif choice == 'b':
    print(
        num_1, " - ", num_2, " = ",
        subtract(num_1, num_2)
    )

elif choice == 'c':
    print(num_1, " * ", num_2, " = ",
          multiply(num_1, num_2)
          )
elif choice == 'd':
    print(
        num_1, " / ", num_2, " = ",
        divide(num_1, num_2)
    )
else:
    print(
        "This is an invalid input"
    )