Hi, i'm trying to slice an array of chars and print it to the screen but it doesn't seems to work, here's the code:

/////////////////////////////////////
import std.string;

alias char[] string;

int main(char[][] args)
{
    printf("hello world\n");
	string hw = "Hello_World";
	printf(cast(char*)hw[0 .. 5]);
    return 0;
}

/////////////////////////////////////

What could be wrong? it just prints to the output "Hello_World".

Heinz

Heinz wrote:
> Hi, i'm trying to slice an array of chars and print it to the screen but it
> doesn't seems to work, here's the code:
> 
> /////////////////////////////////////
> import std.string;
> 
> alias char[] string;
> 
> int main(char[][] args)
> {
>     printf("hello world\n");
> 	string hw = "Hello_World";
> 	printf(cast(char*)hw[0 .. 5]);
>     return 0;
> }
> 
> /////////////////////////////////////
> 
> What could be wrong? it just prints to the output "Hello_World".

printf expects a zero terminated string. Try:

printf(toStringz(hw[0 .. 5]));

or why not use writef instead.

/Oskar

Heinz wrote:
> Hi, i'm trying to slice an array of chars and print it to the screen but it
> doesn't seems to work, here's the code:
> 
> /////////////////////////////////////
> import std.string;
> 
> alias char[] string;
> 
> int main(char[][] args)
> {
>     printf("hello world\n");
> 	string hw = "Hello_World";
> 	printf(cast(char*)hw[0 .. 5]);
>     return 0;
> }
> 
> /////////////////////////////////////
> 
> What could be wrong? it just prints to the output "Hello_World".
> 
> Heinz

What is wrong is that the hello.d in samples.d STILL USES PRINTF. :-(

That gives you and thousands of others the impression that printf is a natural choice for printing stuff in D.

"That gives you and thousands of others the impression that printf is a natural choice for printing stuff in D."

So, what's the real natural choice for printing stuff in D? Thanks

Heinz wrote:
> "That gives you and thousands of others the impression that printf is a
> natural choice for printing stuff in D."
> 
> So, what's the real natural choice for printing stuff in D? Thanks

writef and writefln, in std.stdio.

http://www.digitalmars.com/d/phobos/std_stdio.html

printf is not a part of D.
use writef instead.

import std.stdio;

Heinz wrote:
> Hi, i'm trying to slice an array of chars and print it to the screen but it
> doesn't seems to work, here's the code:
> 
> /////////////////////////////////////
> import std.string;
> 
> alias char[] string;
> 
> int main(char[][] args)
> {
>     printf("hello world\n");
> 	string hw = "Hello_World";
> 	printf(cast(char*)hw[0 .. 5]);
>     return 0;
> }
> 
> /////////////////////////////////////
> 
> What could be wrong? it just prints to the output "Hello_World".
> 
> Heinz

Hasan Aljudy wrote:

> printf is not a part of D.
> use writef instead.

The C library is a part of D, so using std.c.stdio.printf
is OK as long as toStringz is used. Maybe std.stdio.writef
would be easier to use, but both alternatives are valid D.

--anders

Anders F Björklund wrote:
> Hasan Aljudy wrote:
> 
>> printf is not a part of D.
>> use writef instead.
> 
> The C library is a part of D, so using std.c.stdio.printf
> is OK as long as toStringz is used. Maybe std.stdio.writef
> would be easier to use, but both alternatives are valid D.
> 
> --anders

I think it's better to just say printf is not a part of D, to not confuse new comers.

If you must be politically correct, printf is a part of the C standard library, which is available through the std.c package, but its use is not recommended.