Hi guys,

just started to get into Dlang, comming from C and C++ I like to use methods like there if possible.

Now I want to catenate something like this, but don't get it to work
in standard C i code:
   char str[80];
   sprintf(str, "This is a number = %f", 3.14356);

Now in Dlang and import core.stdc.string and
code:
    char [80] str;
    sprintf(str, "This is a number = %d", 314356);
    writefln("%s", str);

but get error
Error: function core.stdc.stdio.sprintf (char* s, const(char*) format, ...) is not callable using argument types (char[80], string, int)

Nor does this work
   char [50] temp = "This is a number";
   string greeting5= temp~" "~314356;
   writefln("%s",greeting5);

result in error:
Error: incompatible types for ((cast(const(char)[])temp ~ " ") ~ (314356)): 'char[]' and 'int'


Any ideas or hints?
/anders

On Tuesday, 29 November 2016 at 10:21:24 UTC, Anders S wrote:
> Hi guys,
>
> just started to get into Dlang, comming from C and C++ I like to use methods like there if possible.
>
> Now I want to catenate something like this, but don't get it to work
> in standard C i code:
>    char str[80];
>    sprintf(str, "This is a number = %f", 3.14356);

import std.format;
string str = format("This is a number = %f", 3.14356);

>
> Now in Dlang and import core.stdc.string and
> code:
>     char [80] str;
>     sprintf(str, "This is a number = %d", 314356);
>     writefln("%s", str);
>

> but get error
> Error: function core.stdc.stdio.sprintf (char* s, const(char*) format, ...) is not callable using argument types (char[80], string, int)
>
> Nor does this work
>    char [50] temp = "This is a number";
>    string greeting5= temp~" "~314356;
>    writefln("%s",greeting5);

import std.conv;
string temp = "This is a number";
string greeting5 = temp ~ " " ~ to!string(314356);


>
> result in error:
> Error: incompatible types for ((cast(const(char)[])temp ~ " ") ~ (314356)): 'char[]' and 'int'
>
>
> Any ideas or hints?
> /anders

On Tuesday, 29 November 2016 at 10:21:24 UTC, Anders S wrote:
> Hi guys,
>
> just started to get into Dlang, comming from C and C++ I like to use methods like there if possible.
>
> Now I want to catenate something like this, but don't get it to work
> in standard C i code:
>    char str[80];
>    sprintf(str, "This is a number = %f", 3.14356);
>
> Now in Dlang and import core.stdc.string and
> code:
>     char [80] str;
>     sprintf(str, "This is a number = %d", 314356);
>     writefln("%s", str);
>

sprintf(str.ptr, "This is a number = %d".toStringz,314356);

> but get error
> Error: function core.stdc.stdio.sprintf (char* s, const(char*) format, ...) is not callable using argument types (char[80], string, int)
>

because in D arrays do not decay to pointers. To get a null terminated string use toStringz

> Nor does this work
>    char [50] temp = "This is a number";
>    string greeting5= temp~" "~314356;
>    writefln("%s",greeting5);
>

add a to!string

314356.to!string

> result in error:
> Error: incompatible types for ((cast(const(char)[])temp ~ " ") ~ (314356)): 'char[]' and 'int'
>
>
> Any ideas or hints?
> /anders

Thanks guys for a really quick answer !!
OK, a little bit awkward to use but getting there
posting a new question about char * to struct ;)

Thanks
/anders

On Tuesday, 29 November 2016 at 15:01:37 UTC, Anders S wrote:
> Thanks guys for a really quick answer !!
> OK, a little bit awkward to use but getting there
> posting a new question about char * to struct ;)
>
> Thanks
> /anders

Also:

import std.conv : text;
string temp = "This is a number";
string greeting5 = text(temp, " ", 314356);

Andrea