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Bug 8531 – formatting string documentation

Status: RESOLVED
Resolution: INVALID
Severity: normal
Priority: P2
Component: phobos
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2012-08-10T03:39:00Z
Last change time: 2012-10-27T09:26:22Z
Assigned to: nobody
Creator: bioinfornatics

Comments

Comment #0 by bioinfornatics — 2012-08-10T03:39:04Z

Dear, In this documentation http://dlang.org/phobos/std_format.html#format-string They do not talk about %u for unsigned number. %u works well with both readf and writef

Comment #1 by hsteoh — 2012-10-27T09:04:03Z

Actually, I think %u is redundant. std.format uses compile-time introspection to do the "right thing" for %d. You can pass an unsigned number for %d and it works correctly. I just tested %u, it seems that it's just an alias for %d: int a = -10; writefln("%u", a); // outputs "-10" So I think this bug is invalid.

Comment #2 by k.hara.pg — 2012-10-27T09:26:22Z

(In reply to comment #1) > Actually, I think %u is redundant. std.format uses compile-time introspection > to do the "right thing" for %d. You can pass an unsigned number for %d and it > works correctly. I just tested %u, it seems that it's just an alias for %d: > > int a = -10; > writefln("%u", a); // outputs "-10" > > So I think this bug is invalid. Yes. And, if programmer really want to format int value as unsigned, he needs to use cast instead of %u. writefln("%d", cast(uint)a); // outputs "4294967286"