Return the complete number

[Greatsam4sure]

On Wednesday, 24 July 2019 at 15:57:06 UTC, a11e99z wrote:
> On Wednesday, 24 July 2019 at 15:56:13 UTC, a11e99z wrote:
>> On Wednesday, 24 July 2019 at 15:45:08 UTC, Greatsam4sure 
>> wrote:
>>> int main(){
>>>  double mum = 0;
>>>  Write("enter a number: ")
>>>  readf(" %s\n",&num);
>>>  Writeln(num);
>>>
>>> }
>>>
>>> How do I return the complete number the user enter since I 
>>> don't since the user can enter numbers of various length with 
>>> dmd approximating it.
>>>
>>> I will appreciate any help
>>
>>   readf!" %s\n"( num );
>> or
>>   num.readf!" %s\n";
>> or
>>   num = readln.strip.to!double;

       writeln(num)

The result is always to six significant figure. I want the whole 
number to be diaplay
>
> oops! i misunderstood