Re: Return the complete number
On Wednesday, 24 July 2019 at 16:16:15 UTC, Greatsam4sure wrote:
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",);
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
So, there are several possible issues here. First, floating-point
numbers have limited precision - a double can not correctly
represent all integers above 2^52, for instance. That's 4.5
quadrillion though, so rarely an issue. In your case, as others
have commented, writefln with a correctly chosen format string[1]
will do the trick.
However, what is the correctly chosen format string? This is a
very hard question to answer, as it depends on what number was
typed, and what you mean by 'the complete number the user enter'.
While drug's suggestion of "%.16f" will return an accurate
representation of the floating-point number, it will include a
lot of trailing zeroes that were presumably not present in the
input string. It will also expose floating-point's limitations
when presented with huge numbers, like 1e23 will print
1603000.. The best option might
be "%.16g", which will choose the shortest of the scientific
notation and the regular notation, as well as strip trailing
zeroes. Depending on the criteria though, this might still not be
the optimal solution.
--
Simen
1: https://dlang.org/phobos/std_format.html#format-string
Re: Return the complete number
On Wednesday, 24 July 2019 at 16:16:15 UTC, Greatsam4sure wrote: 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 The result is always to six significant figure. I want the whole number to be display see another answers at thread https://forum.dlang.org/post/qh9v10$19v1$1...@digitalmars.com https://forum.dlang.org/post/afzqnnorzwosimfqn...@forum.dlang.org
Re: Return the complete number
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",);
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
Re: Return the complete number
On Wednesday, 24 July 2019 at 15:45:08 UTC, Greatsam4sure wrote:
int main(){
double mum = 0;
Write("enter a number: ")
readf(" %s\n",);
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
as drug said: writefln with formatting
in case no need prints just string representation use
s/format https://dlang.org/phobos/std_format.html#format
auto str = num.format!"%.16s"; // using UFCS
or
auto str = "%.16s".format( num); // UFCS too for 2nd version of
format
or
string str = format( "%.16s", num);
simple help can be asked on IRC channel too
irc://irc.freenode.net/d
(HexChat, mIRC clients and others)
Re: Return the complete number
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",);
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;
oops! i misunderstood
Re: Return the complete number
On Wednesday, 24 July 2019 at 15:45:08 UTC, Greatsam4sure wrote:
int main(){
double mum = 0;
Write("enter a number: ")
readf(" %s\n",);
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;
Re: Return the complete number
24.07.2019 18:45, Greatsam4sure пишет:
int main(){
double mum = 0;
Write("enter a number: ")
readf(" %s\n",);
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
does it help?
writefln("%.8f", num); // for float
writefln("%.16f", num); // for double
Return the complete number
int main(){
double mum = 0;
Write("enter a number: ")
readf(" %s\n",);
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
