On Sunday, 15 March 2015 at 15:41:09 UTC, Darts wrote:
Hey, I'm just looking for how to turn some numbers into strings
in particualr ways. Specifically, I want to force some ints
(and maybe floats too) to give me a string that consists of
exactly four numbers ( 3005, 0038, 0130, etc ). I'd also like
to know how to format a float to give me only one decimal
place. If there are ways to print out in hex or scientific
notation I'd also like to know about those too!
import std.stdio;
int x = 42;
writefln("int: %04d", x);
float f = 3.14159;
writefln("float: %.1f", f);
writefln("hex: 0x%08x", x);
If you need to work with the string instead of printing it, use
format():
import std.string : format;
// in not-yet released DMD 2.067
// import std.format : format;
// is also possible
string s = format("%04d", 42);
Here's the explanation of the format strings:
http://dlang.org/phobos/std_format.html
Unfortunately the layout is broken at the moment. Anyway, if
you're unfamiliar with format strings, it may be better to read
one of the existing format string tutorials. Randomly picked one
of the Google results:
http://www.cprogramming.com/tutorial/printf-format-strings.html
This one is about C's printf() function, but it's applicable to
D, too, because format strings are almost identical in both
languages.
