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D.gnu - String - append char

reply "Matesax" <matesax gmail.com> writes:
Hi,
I need to append chars into string in foreach statement.

void main(string[] args)
{
	string

		result = "",
		source = chomp(readText(args[1]));

	foreach(int index, char letter; source)
		result += letter; //14

	writeln(result);
}

But it returning:

main.d:14: Error: 'result' is not a scalar, it is a string
main.d:14: Error: incompatible types for ((result) += (letter)): 
'string' and 'char'

I try an pointer, but it damaged a string...
Thank you for help.
Oct 09 2013
parent reply "Brad Anderson" <eco gnuk.net> writes:
On Wednesday, 9 October 2013 at 20:47:04 UTC, Matesax wrote:

 Hi,
 I need to append chars into string in foreach statement.

 void main(string[] args)
 {
 	string

 		result = "",
 		source = chomp(readText(args[1]));

 	foreach(int index, char letter; source)
 		result += letter; //14

 	writeln(result);
 }

 But it returning:

 main.d:14: Error: 'result' is not a scalar, it is a string
 main.d:14: Error: incompatible types for ((result) += 
 (letter)): 'string' and 'char'

 I try an pointer, but it damaged a string...
 Thank you for help.


Concatenation uses the ~ operator so change your foreach body to:

result ~= letter;

Strings in D are immutable so you could have just assigned them 
too (result = source) with almost the same result (the memory 
locations would be the same but that isn't a problem because of 
the aforementioned immutability).

In the future I recommend posting general questions about D to 
the D.learn NG/forum where more people will see them.  This forum 
is for GDC specific discussion.
Oct 09 2013
parent "Matesax" <matesax gmail.com> writes:
Oh - thank you... :D
Oct 09 2013