[Flang-dev] overflow on integer output

blubee blubeeme gurenchan at gmail.com
Wed Aug 22 20:36:40 EDT 2018


On Thu, Aug 23, 2018 at 8:04 AM Mehmet Erol Sanliturk <
m.e.sanliturk at gmail.com> wrote:

>
>
> On Thu, Aug 23, 2018 at 2:36 AM, blubee blubeeme <gurenchan at gmail.com>
> wrote:
>
>> I get some strange output after compiling Fortran code and running it.
>>
>> Example, here's a sample program; snakes and ladders.
>> Source code: https://pastebin.com/ckS6tmfW
>> Here's the output: https://pastebin.com/eqeTx0Xu
>>
>> This program calculates the area of a cylinder:
>> https://pastebin.com/qRPkUaVa
>> here's the output again:
>> Enter radius and height.
>> 21
>> 100
>> radius= 21.00     height=100.00     area=******
>> Perform another calculation? y[n]
>> quite a few test programs gives ***** for number values, do you know why?
>>
>> it could be something wrong with the source code that I am compiling, a
>> problem in the way I edited the flang source and introduced a bug or I need
>> to pass some compiler flags to get the output code to display properly or
>> maybe something that I haven't thought about yet.
>>
>> Do you have any idea why?
>>
>> Best,
>> Owen
>>
>>
>
>
> First thing to come to mind is the following :
>
>
>
>
> The value to be printed is larger than the area defined by your FORMAT
> specifier for it .
>
> For example , your value is   345.75 , your FORMAT specifier for it is
> F5.3 means  value will be printed in the form   xx.xxx .
> Then you will see   ***** in that area because   345. is greater than 99 (
> more than two digits ) ...
> Increase your FORMAT specifier for the value , for example  F7.2 :  345.75
> will be printed correctly .
>
>
>
> Mehmet Erol Sanliturk
>
>
>
>
>
>
>
>
> Yes, this was it; it worked for the cylinder area program. I'll have to
see how to fix the snakes and ladders program but I appreciate the tip!

Best,
Owen
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