how to make a calculator in python

This is going to be a tutorial for beginners who know the basics of python. That is floats, and input and print. So, were going to start with two lines of code:

``````import math
while True:
math = input()``````

This will get the computer the information for it to know if we are going to do multiplication, division, addition, or subtraction. We will start with addition:

``````    if d == “plus”:
digit_1 = input()
digit_2 = input()``````

This will get us all the inputs we need. If you want, you can add a + or plus in there, but I just just put nothing. This is what it would look like if there was a plus:

``````    if d == “plus”:
digit_1 = input()
digit_2 = input(“plus or +”)``````

Next we need to add it together. We can’t do `answer = digit_1 + digit_2`, or that would be monkey math (which would be funny, but we don’t want it in our calculator). You can do that if you want. So we will just add `float(digit_1) + float(digit_2)` instead:

``````answer = float(digit_1) + float(digit_2)

The rest of the code is basically the same, but with -, *, and /. So just copy and paste this all in to your repl:

``````    elif d == "minus":
a = input()
b = input()
c = float(a) - float(b)
print(c)

elif d == "square":
a = input()
b = float(a) * float(a)
print(b)

elif d == "divide":
a = input()
b = input()
if b == "0":
print("infinity")
else:
c = float(a) / float(b)
print(c)

elif d == "times":
a = input()
b = input()
c = float(a) * float(b)
print(c)``````

It’s pretty simple. I’ll just explain the infinity filter. If you divide anything by zero it’s infinity. If you don’t add the filter, there will be a divide by zero error. So we just check if it’s zero, and if it is, it will print infinity. Also simple!

I hope you liked this tutorial. It was really fun to make. I also hope this influences future coding, and I hope you have fun coding!
Goodbye.

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