On Friday, 11 January 2013 at 12:17:32 UTC, evilrat wrote:
On Friday, 11 January 2013 at 09:44:31 UTC, Lubos Pintes wrote:
Hi,
Do I correctly suppose this is not possible? Because I don't
understand fully the compiler error.
import std.stdio;
void main() {
int[] a;
stdin.readf(" %s",&a);
writeln(a);
}
what is the definition of format of "array" to read from file?
from your example it is reading formatted(%s = simply any
string terminated by enter, also prepended by a space?) from
standard input.
try something like this
import std.file, std.ascii;
void read()
{
// reads whole file to string, use std.file.byLine or others on
large files
auto data = cast(string) read("path_to_file");
// array storing your data
int[] numbers;
// run through the all content readed from file
foreach(ch; data)
{
// if character is a number put it to numbers array
if ( std.ascii.isNumber(ch) )
numbers ~= cast(int) ch;
}
}
Brrr....
Don't parse data yourself! Your code, for example, will only
parse digits single digits, and will parse "25" as [2, 5]...
Use conv.to !
If your input is an actual array format, you can simply do this:
//----
import std.stdio;
import std.conv;
import std.string;
void main()
{
auto file = File("data.txt", "r");
foreach (line; file.byLine())
{
auto numbers = to!(int[])(line.strip());
writeln(numbers);
}
}
//----
Here is another approach, that will split your input into strings
that only contains digits, and as such, can be parsed:
//----
import std.stdio;
import std.conv;
import std.algorithm;
import std.array;
import std.ascii;
void main()
{
auto app = appender!(int[])();
auto file = File("data.txt", "r");
foreach (line; file.byLine())
{
auto stringEntries =
std.algorithm.splitter!"!std.ascii.isDigit(a)"(line);
auto numberEntries =
stringEntries.filter!"!a.empty"().map!"to!int(a)"();
app.put(numberEntries);
}
writeln(app.data);
}
//----
Even this approach is kind of hackish though, and will not
support numbers in hex format for example, or floats either. But
that's the best you get for a completely generic parser that has
no information on format what so ever.
