On 03/26/2012 04:55 AM, Tyro[17] wrote:
>> > void main(string[] args)
>> > {
>> > string s1;
>> > double d;
>> > string s2;
>> >
>> > writeln("Enter a @ terminated string (multiline ok):");
>> > readf(" %s@", &s1);
>> > auto arr = s1.split();
>> >
>> > if (!stdin.eof()) {
Ah! That's one of the problems. stdin has no idea whether there are more
characters available. eof() being true is not dependable unless an
attempt to read a character is made and failed. This is the case in C
and C++ as well.
>> > writeln("The stream is not empty.");
>> > } else {
>> > writeln("The stream is empty.");
>> > }
>> > writeln("Enter another string (terminated with
>> cntrl-d|ctrl-z):");
>>
>> I am not sure about the cntrl-d|ctrl-z part though. Since it
>> terminates the input, the program should not be able to read any more
>> characters.
I would like to repeat: ending the stream is not a solution because you
want to read more data.
>>
>> > readf(" %s", &s2); // No matter how many read attempts
That's the actual problem, and ironically is already known to you. :)
Use a \n at the end of that format string.
>>
>> I advise reading string by readln(). You can call chomp() to get rid
>> of whitespace around it:
>>
>> while (s2.length == 0) {
>> s2 = chomp(readln());
>> }
>
> You can achieve the same with:
>
> readf(" %s\n", &s2);
Thank you. However, that method does not remove trailing whitespace.
> My goal however, is not to read one line of information. Rather, it is to
> read multiple lines of information from standard input. I get close to
> being able to do so if i don't including "\n" as a part of my format
string
> or if I changing your suggestion to
>
> while (!stdin.eol()) {
> s2 = chomp(readln());
> }
>
> but again I run into the predicament was before, a need to close the
> the stream with Ctrl-D/Ctrl-Z.
If I understand you correctly, the following program works for me:
import std.stdio;
import std.string;
void main(string[] args)
{
string s1;
double d;
string s2;
writeln("Enter a @ terminated string (multiline ok):");
readf(" %s@", &s1);
auto arr = s1.split();
writeln("Enter a line of string:");
readf(" %s\n", &s2);
writeln("Enter a decimal value:");
readf(" %s", &d);
writeln("d = ", d);
writeln("arr = ", arr);
writeln("s = ", s2);
}
Ali
