A More Advanced Calculator¶

In this exercise we will build a calculator that can do addition, subtract, multiplication, and division.

User Input¶

The user will be prompted with three things:

1. The operation
2. The first_number
3. The second_number

Valid operations are:

• 'ADD'
• 'SUBTRACT'
• 'MULTIPLY'
• 'DIVIDE'

Output¶

• If the user inputs 'ADD', the progam should print the result of first_number + second_number.
• If the user inputs 'SUBTRACT', the progam should print the result of first_number - second_number.
• If the user inputs 'MULTIPLY', the progam should print the result of first_number * second_number.
• If the user inputs 'DIVIDE', the progam should print the result of first_number / second_number.
• Any other output, the program should print "Incorrect operation"

Example¶

Enter the operation: MULTIPLY
Enter the first number: 7
Enter the second number: 5
The result is: 35

Provided¶

Provided is some sample code to start that gets the user's input for the operation as a string and the first_number and second_numbers as integers.

In [13]:

# Get input will return "ADD", "SUBTRACT", "MULTIPLY", or "DIVIDE"
def get_input(valid_inputs):
    while True:
        operation = input("Enter the operation: ")
        if operation in valid_inputs:
            return operation
        else:
            print("invalid operation")


first_number = int(input("Enter the first number: "))
second_number = int(input("Enter the second number: "))
operation = get_input(["ADD", "SUBTRACT", "DIVIDE", "MULTIPLY"])

print("do you want to continue?")
yes_no = get_input(["yes", "no"])
if yes_no == "yes":
    if operation == "ADD":
        result = first_number + second_number
    elif operation == "SUBTRACT":
        result = first_number - second_number
    elif operation == "MULTIPLY":
        result = first_number * second_number
    elif operation == "DIVIDE":
        result = first_number / second_number
    print(f"The result is {result}")

# Get input will return "ADD", "SUBTRACT", "MULTIPLY", or "DIVIDE" def get_input(valid_inputs): while True: operation = input("Enter the operation: ") if operation in valid_inputs: return operation else: print("invalid operation") first_number = int(input("Enter the first number: ")) second_number = int(input("Enter the second number: ")) operation = get_input(["ADD", "SUBTRACT", "DIVIDE", "MULTIPLY"]) print("do you want to continue?") yes_no = get_input(["yes", "no"]) if yes_no == "yes": if operation == "ADD": result = first_number + second_number elif operation == "SUBTRACT": result = first_number - second_number elif operation == "MULTIPLY": result = first_number * second_number elif operation == "DIVIDE": result = first_number / second_number print(f"The result is {result}")

Enter the first number: 3
Enter the second number: 2
Enter the operation: ADD
do you want to continue?
Enter the operation: yes
The result is 5

In [ ]:

def print_max(a, b):
    if a > b:
        print(f"{a} is max")
    elif b > a:
        print(f"{b} is max")
    else:
        print("equal")

print_max(3, 4)
print_max(7, 4)
print_max(10, 10)

def print_max(a, b): if a > b: print(f"{a} is max") elif b > a: print(f"{b} is max") else: print("equal") print_max(3, 4) print_max(7, 4) print_max(10, 10)

In [14]:

from random import randint

from random import randint

In [15]:

randint(1, 100)

randint(1, 100)

Out[15]:

68

In [16]:

help(randint)

help(randint)

Help on method randint in module random:

randint(a, b) method of random.Random instance
    Return random integer in range [a, b], including both end points.

In [ ]: