How to Make calculator With out if else?

Question

I tried to make a calculator in python with out if else statements . i can't find how to fix a issue in present code

def add(n1, n2):
return n1+n2
def sub(n1, n2):
    return n1-n2
def mul(n1, n2):
    return n1*n2
def div(n1, n2):
    return n1/n2
def pow(n1, n2):
    return n1^n2
operations_and_functions= {
    "+":"add",
    "-":"sub",
    "*":"mul",
    "/":"div",
    "^":"pow",
}
num1 = int(input("What is your first number=> "))
num2 = int(input("What is your second number=> "))
for operations in operations_and_functions:
    print(operations)
***operation = str(input("What operation do you want to do=> "))
calculation = operations_and_functions[operation](num1,num2)***
answer = calculation(num1,num2)
print(f"{num1} {calculation} {num2} is equal to {answer}")

I can't convert this code" [operations_and_functionsoperation" into "add(num1,num2)"

Don't you want the actual functions in your dictionary, `"+":add,` etc. instead of the *names* of the functions? — khelwood, Sep 02 '21 at 07:49
`n1^n2` does not do what you think does. `n1**n2` is what you are looking for — user2390182, Sep 02 '21 at 07:50

user2390182 · Answer 1 · 2021-09-02T07:58:28.223

2

The values of your dict should be the functions themselves, not strings. Also, don't call the result again:

from operator import add, sub, mul, truediv, pow

operations_and_functions= {
    "+": add,
    "-": sub,
    "*": mul,
    "/": truediv,
    "^": pow,
}
num1 = 3
num2 = 5
operations_and_functions["+"](num1,num2)
# 8
operations_and_functions["-"](num1,num2)
# -2
operations_and_functions["*"](num1,num2)
# 15
operations_and_functions["/"](num1,num2)
# 0.6
operations_and_functions["^"](num1,num2)
# 243

You can of course define the functions yourself, as you did. One fix there:

def pow(n1, n2):
    return n1**n2

In Python, ^ is the bitwise XOR operator.

edited Sep 02 '21 at 07:58

answered Sep 02 '21 at 07:53

user2390182

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Thankyou For Answering My Doubt – Abdul Haq Nov 19 '21 at 08:18
`pow` is already a builtin function: https://docs.python.org/3/library/functions.html#pow – Stef Jul 26 '22 at 08:08

How to Make calculator With out if else?

1 Answers1