CODEWITHSUNDEEP
python
user2465510
user2465510

Reputation: 99

Confusing result from raw_input() in Python

I'm having problems with the "operator" variable. So far I have only tried +. It doesn't seem to register and I can't figure out why. i'm using the online python interpreter on repl.it because I'm having problems with my computer.

EDIT: I should probably add that I just started learning Python (I had some Java experience but it was years ago). I'm trying to create a simple text calculator.

    restart=raw_input("to restart calculations enter \'true\'")

    #if restart == "true":
        #stuff

    numone=raw_input("Enter the first number: ")
    operator = raw_input("Enter the operator(+,-,*,/):")
    operator = str(operator)
    numtwo=raw_input("Enter another number: ")
    print("operator: " + operator)

    if operator== '+':
        answer=numone+numtwo
        print(answer)
        print("test")

    if operator == "-":
        answer=numone-numtwo
        print(answer)

    else:
        print("something went wrong")

    #if operator == "*":

Upvotes: 0

Views: 173

Answers (2)

sundar nataraj
sundar nataraj

Reputation: 8702

Give elif to the second statement

since user give '+'

first if statment excutes but in next statement it fails and go to the else so for + you get two result both addition and something wrong

and also you need to convert the operands to integer

one more thing while converting to integer you need check right conditions for integer else it will give error

numone=raw_input("Enter the first number: ")
operator = raw_input("Enter the operator(+,-,*,/):")
operator = str(operator)
numtwo=raw_input("Enter another number: ")
print("operator: " + operator)

if operator== '+':
    try:        
        answer=int(numone)+int(numtwo)
        print(answer)
        print("test")
    except  ValueError:
        print "one of the operand is not integer"

elif operator == "-":
    try:
       answer=int(numone)-int(numtwo)
       print(answer)
       print("test")
    except  ValueError:
       print "one of the operand is not integer"        

else:
    print("something went wrong")

Upvotes: 2

Maroun
Maroun

Reputation: 95998

Your problem is that you're concatenating two strings, you should cast to int before:

answer = int(numone) + int(numtwo)

Why? Because raw_input reads the input as string.

Upvotes: 3

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