Python simple calculator not working, anybody can help?

Question

while True:
print("Options")
print("Enter '+' for addition")
print("Enter '-' for subtraction")
print("Enter '*' for multiplication")
print("Enter '/' for division")
print("To exit please enter 'E'")
user_input=input(":")
if user_input == "E":
break
elif user_input == "+":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 + num2
print("The answer is " + result)
elif user_input == "-":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 - num2
print("The answer is " + result)
elif user_input == "*":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 * num2
print("The answer is " + result)
elif user_input == "/":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 / num2
print("The answer is " + result)
else:
print("Unknown input!")

anybody can help with my code? i couldnt run it as a calculator.. not sure which part is wrong.. thanks in advanced!!!

Answer 1

That line at 8 keeps accepting input from user and you need to give all the inputs at once in sololearn

+
5
6
E // to break out of loop

Answer 2

Check these statements
print("The answer is " + result)

By using + you are concatenating string and float which results in error ,instead it should be

print("The answer is"+str(result))
Or
print("The answer is ",result)
Or
print(f"the answer is {result}")
Or
print("The answer is {0}".format(result))

Answer 3

You can give unlimited inputs here as well but it isn't interactive like in pydroid3 ,

Answer 4

You should convert the float result to string, like this:
while True:

print("Enter '+' for addition")
print("Enter '-' for subtraction")
print("Enter '*' for multiplication")
print("Enter '/' for division")
print("To exit please enter 'E'")
user_input=input(":")
if user_input == "E":
break
elif user_input == "+":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 + num2
print("The answer is " + str(result))
elif user_input == "-":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 - num2
print("The answer is " + str(result))
elif user_input == "*":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 * num2
print("The answer is " + str(result)
)
elif user_input == "/":
num1 = float(input("Enter a number"))
num2 = float(input("Enter another number"))
result = num1 / num2
print("The answer is " + str(result))

Answer 5

@kiibo ghayal

hi, below is the link of my python calculator

https://code.sololearn.com/cI0i4ar9MqfS/#py

Answer 6

@Abhay

hi, i just edited to print("The answer is ",result) and key in the input as :
+
2
2

but below is the output i get:

Options
Enter '+' for addition
Enter '-' for subtraction
Enter '*' for multiplication
Enter '/' for division
To exit please enter 'E'
:Enter a numberEnter another numberThe answer is 4.0
Options
Enter '+' for addition
Enter '-' for subtraction
Enter '*' for multiplication
Enter '/' for division
To exit please enter 'E'
:

Traceback (most recent call last):
File "./Playground/file0.py", line 8, in <module>
user_input=input(":")
EOFError: EOF when reading a line

may i know why line 8 is wrong???

Answer 7

@Abhay

wow thanks alot, finally i got it!!

@Kiibo Ghayal

do you mean using the same code in Pydroid3 or Qpython, can do for more inputs?