Re: [Dev-C++] Dev-cpp-users Digest, Vol 21, Issue 2
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Re: [Dev-C++] Dev-cpp-users Digest, Vol 21, Issue 2
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From: Shawn <tre...@gm...> - 2008-02-13 14:09:46
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Thanks everyone!
:)
Mayank Jain Nawal wrote:
> Dear
>
> There is no problem with the bool data type. In the below code
> comparison operator has been used instead of assignment operator for
> changing the value of output variable. So in the below code value of
> output variable is never changed to false and during the conditional
> checking in the if statement it get its value as true.
>
>
>
>> ------------------------------
>>
>> Message: 2
>> Date: Tue, 12 Feb 2008 00:03:54 -0500
>> From: Shawn <tre...@gm...>
>> Subject: Re: [Dev-C++] bool data type
>> To: ll...@cd...
>> Cc: dev...@li...
>> Message-ID: <47B...@gm...>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> I'm working with C++ though, my book says that the bool data type is
>> a built-in type consisting of just two values, the constants true and
>> false.
>> I have the program compiling without error now, however, it still
>> prints the last statement even though I didn't enter valid data.
>> int main()
>> {
>>
>> //Declare and initialize variables
>> float weight = 0.0;
>> float distance = 0.0;
>> float shippingRate = 0.0;
>> float shippingCharges = 0.0;
>> * bool output = true;*
>>
>>
>> //Intro
>> cout<<endl;
>> cout<<"Thank you for shipping with The Fast Freight Company!!!\n\n";
>>
>>
>> //Prompt user for the weight of their package
>> cout<<"Please enter the weight of your pacakge(in grams): ";
>> cin>>weight;
>> cout<<endl;
>> if (weight <= 0 || weight > 20000)
>> {cout<<"Please enter either a positive number or a weight of 20
>> kilograms or less for your package.\t\t";
>> *output == false;*} //use = sign here **instead of ==**
>>
>> //Prompt user for distance the package will travel
>> cout<<"Please enter the distance the package will travel(in miles): ";
>> cin>>distance;
>> cout<<endl;
>> if (distance < 10 || distance > 3000)
>> {cout<<"We don't ship to distances of less then 10 miles or more
>> then 3000 miles.\t\t";
>> * *output == false;*} // use = sign here instead of ==*
>>
>>
>> //Evaluate weight input
>> if (weight <= 2000)
>> shippingRate = 1.10;
>> else if (weight > 2000 && weight <= 6000)
>> shippingRate = 2.20;
>> else if (weight > 6000 && weight <= 10000)
>> shippingRate = 3.70;
>> else
>> shippingRate = 4.80;
>>
>> //Evaluate distance input
>> if (distance >= 10 && distance <= 500)
>> distance = 500;
>> else if (distance >= 501 && distance <=1000)
>> distance = 1000;
>> else if (distance >= 1001 && distance <= 1500)
>> distance = 1500;
>> else if (distance >= 1501 && distance <= 2000)
>> distance = 2000;
>> else if (distance >= 2001 && distance <= 2500)
>> distance = 2500;
>> else
>> distance = 3000;
>> //Perform the calculations shippingCharges =
>> shippingRate * (distance/500);
>> //Evaluate if output is needed
>> //if (weight > 0 && weight <= 20000 && distance >= 10 && distance <=
>> 3000)
>> *if (output == true) *
>> //Output shipping charges
>> {cout<<fixed<<showpoint;
>> cout<<"The total shipping charges for your package is
>> $"<<setprecision(2)<<shippingCharges<<endl;}
>>
>> return 0;
>> }
>>
>> When I enter 0 for both or just one prompt, the program still
>> displays both the total shipping charges as $6.60 and the input
>> validation message.
>> When I uncomment out the *if (weight > 0 && weight <= 20000 &&
>> distance >= 10 && distance <= 3000) *line, it works just fine so I
>> have to be using bool wrong somehow.
>>
>> Lloyd wrote:
>>
>>> //C does not have bool data type
>>> enum
>>> {
>>> FALSE=0,
>>> TRUE=1
>>> };
>>>
>>> typedef int bool;
>>>
>>> int main()
>>> {
>>> bool a=TRUE;
>>> }
>>>
>>>
>>> On Mon, 2008-02-11 at 18:36 -0500, Shawn wrote:
>>>
>>>> Thanks, but the compiler is still saying 'TRUE' undeclared (first use
>>>> this function) and points me to the line where I initialize it to TRUE
>>>> at the beginning of my program.
>>>> bool output = TRUE;
>>>>
>>>> I thought that as soon as you call bool, the compiler knows it's
>>>> either going to be true or false?
>>>> pepone.onrez wrote:
>>>>> dev...@li...
>>>>>
>>>>> On Feb 12, 2008 12:09 AM, Shawn <tre...@gm...> wrote:>
>>>>>
>>>>>> but then what would I put just before the total shipping charges
>>>>>>
>>>>> line so it wouldn't print?
>>>>> if(output == TRUE){
>>>>> //output is TRUE to what you whan
>>>>> }else{
>>>>>
>>>>>
>>>>> }
>>>>>
>>>>> -------------------------------------------------------------------------
>>>>>
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>
>
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