Yeah, I'll be honest I did not really understand the float concept, thanks for
explaining that =). So basically model does not have to be defined in try:
because it does not need to be told to be put into point number?
Okay so my final program is:
model=raw_input("What kind of car do you drive?")
gallons=raw_input("How many gallons have you driven?")
miles=raw_input("How many miles have you driven?")
try:
number1 = float(gallons)
number2 = float(miles)
except ValueError:
print "some values are wrong type."
else:
print "Your average number of miles to gallons is",
print number1 / number2
Thanks guys created my first successful program ! =D
On Apr 27, 2011, at 3:13 PM, Alan Gauld wrote:
>
> "Johnson Tran" <aznj...@me.com> wrote
>
>> Thanks for the reply Alan and Noah, I really appreciate
>> the help. I am really trying to understand this although
>> still cannot seem to grasp it all.
>
> Lets step back a stage.
>
> Do you understand what float() does?
>
>> I have modified my program although now it seems
>> to be giving me the wrong answer with the correct
>> answer when I input any value.
>>
>> model=raw_input("What kind of car do you drive?")
>> gallons=raw_input("How many gallons have you driven?")
>> number1 = float (gallons)
>
> This is taking the value typede by the user and trying
> to convert it from a string to a floating point number - that is,
> a decimal value
>
>> miles=raw_input("How many miles have you driven?")
>> number2 = float (miles)
>
> Similarly this converts the input string to a decimal value,
> if possible.
>
>> try:
>> model=float(model)
>
> But what is this doing?
>
> It is trying to convert the model of car to a decimal value.
> Unless trhe car is a Porche 911 or similar its unlikely
> to succeed! If its a Toyota Prius it will fail with a ValueError
> exception.
>
>> except ValueError:
>> print "I cannot compute your total miles to gallon with those values."
>
> And therefore print this message
>
>> else:
>> print "Your average number of miles to gallons is",
>> print number1 / number2
>
> The second print needs to be inside the else too.
>
>> What kind of car do you drive?fire
>> How many gallons have you driven?10
>> How many miles have you driven?5
>> I cannot compute your total miles to gallon with those values.
>
> Because it cannot convert 'fire' to a decimal value.
>
> HTH,
>
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
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