Error reading char in read

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On Friday, 17 February 2017 at 18:57:55 UTC, Ali Çehreli wrote:
> On 02/17/2017 07:48 AM, Jean Cesar wrote:
>> import std.stdio;
>> import std.string;
>>
>>
>> auto read(C)(ref C c, char[80] message)
>> if (isSomeChar!C) {
>>     writef("\n\t%s: ", message);
>>     c = strip(readf());
>>     readf(" %s", &t);
>>     return c;
>> }
>>
>> void main()
>> {
>>  char[50] message;
>>   read(message,"Digite Seu nome: ");
>>  writeln(message);
>> }
>>
>> estou tentando fazer um leitor de vetor de char porem esta 
>> dando erro
>
> My recommendation is to read some tutorials as there are many 
> large and small differences between D, C++, and Java.
>
> Some notes:
>
> - In D, char is UTF-8 code unit. Perhaps you want to read ubyte 
> (or byte)?
>
> - isSomeChar is defined in std.traits. You must import 
> std.traits if you want to use isSomeChar:
>
>   https://dlang.org/phobos/std_traits.html
>
> - From the way you call read(), it looks like you want to read 
> a char array (vector), not a single char. So, isSomeChar is 
> wrong.
>
> - It is common to use the string type in D. string is an array 
> of immutable chars. We can change my read() function to read 
> char[] as well:
>
> - Static arrays like char[50] are different from slices like 
> char[].
>
> The read() examples I had given are incomplete: They should 
> work with value types and dynamic strings but not with static 
> arrays. Here is another read() that works with char arrays:
>
> import std.stdio;
> import std.string;
> import std.traits;
> import std.range;
> import std.algorithm;
>
> auto read(S)(ref S s, string message)
> if (isSomeString!S) {
>     import std.string : strip;
>     writef("%s: ", message);
>     s = readln().strip();
>     return s;
> }
>
> auto read(S)(ref S s, string message)
> if (isStaticArray!S &&
>     isSomeChar!(ElementType!S)) {
>
>     string tmp;
>     read(tmp, message);
>
>     // Clear the array
>     s[] = typeof(s[0]).init;
>
>     // Assign without going out of bounds
>     const len = min(s.length, tmp.length);
>     s[0..len] = tmp[0..len];
>
>     return s;
> }
>
> void main()
> {
>     char[50] message;
>     read(message,"Digite Seu nome: ");
>     writeln(message);
> }
>
> However, you'll see that static arrays may not be suitable for 
> reading text, as char[50] will never know how long the actual 
> text is. Here is the output:
>
> Digite Seu nome: : Jean
> Jean\377\377\377[...]
>
> For that to work, you would have to rely on the old C 
> representation of strings with the '\0' character:
>
>     // Assign without going out of bounds
>     const len = min(s.length, tmp.length);
>     s[0..len] = tmp[0..len];
>     const nullChar = min(s.length - 1, len);
>     s[nullChar] = '\0';
>
> However, it still doesn't work because char[50] still has 50 
> characters:
>
> Jean^@\377\377[...]
>
> As you see, you better use 'string' (or its mutable version, 
> char[]) for such text.
>
> And again, it will take a long time to go through these basics 
> unless you start with some tutorials:
>
>   https://tour.dlang.org/
>
> For strings:
>
>   https://tour.dlang.org/tour/en/basics/alias-strings
>
> Some books:
>
>   https://wiki.dlang.org/Books
>
> Ali

So I executed it here anyway but still it presents arbitrary 
characters in the char ..

What I thought was to create a reader where I could receive,
Char, string, int, float, double, real, for my future codes ....

I tried doing this to understand how the char reading was, it is 
preferable to use strings but the language has some specific 
reader for char?

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