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error compiling example

 
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Mon Feb 05, 2007 12:23 pm    Post subject: error compiling example Reply with quote
Code:
import std.cstream; /* for din.readLine() */
import std.stdio;   /* for writef()/writefln() */
 
int main()
{
  char[] name;

  writef("Hello friend. Please enter your name: ");
  name = din.readLine();

  writefln("Thanks, %s",name);
}


When I compiling it in Elephant I have got error "Function test.main expected to return a value of type int" who can explain this error?
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Derek Parnell



Joined: 22 Apr 2004
Posts: 408
Location: Melbourne, Australia
PostPosted: Mon Feb 05, 2007 1:12 pm    Post subject: Re: error compiling example Reply with quote
Rohan wrote:
Code:
import std.cstream; /* for din.readLine() */
import std.stdio;   /* for writef()/writefln() */
 
int main()
{
  char[] name;

  writef("Hello friend. Please enter your name: ");
  name = din.readLine();

  writefln("Thanks, %s",name);
}


When I compiling it in Elephant I have got error "Function test.main expected to return a value of type int" who can explain this error?


You coded : int main()

Which means that you wanted main() to return an int value but you do not have a return statement coded.

Either insert a sreturn statement or change it to: void main()
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Derek
skype name: derek.j.parnell
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Mon Feb 05, 2007 1:29 pm    Post subject: Reply with quote
That mean bug in tutorial?
http://en.wikibooks.org/wiki/A_Beginner%27s_Guide_to_D/The_Basics/Basic_Input
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jcc7



Joined: 22 Feb 2004
Posts: 657
Location: Muskogee, OK, USA
PostPosted: Mon Feb 05, 2007 3:10 pm    Post subject: Reply with quote
Does this example work better for you? StdInStdOutStreamsExample
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Wed Feb 07, 2007 10:25 am    Post subject: Reply with quote
Thanks! Where I can read about format string spec in D?
When need %lf and when other...
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jcc7



Joined: 22 Feb 2004
Posts: 657
Location: Muskogee, OK, USA
PostPosted: Wed Feb 07, 2007 2:33 pm    Post subject: Reply with quote
The formatting strings depend on which function you're using.

If you want to use writefln (in std.stdio) or doFormat (in std.format):
http://www.digitalmars.com/d/phobos/std_format.html#format-string

If you want to use printf (or C-style formatting):
http://www.prowiki.org/wiki4d/wiki.cgi?HowTo/printf

I'd recommend you use writefln or doFormat as you'll have to opportunity for friendlier runtime error messages (printf will only tell you "Access Violation").
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Sat Apr 07, 2007 8:09 am    Post subject: Reply with quote
Code:
import std.stdio;
import std.c.stdio;

int main() {
    char x, y, q;
    writef("Please enter value for x: ");
    scanf("%s", & x);
    writef("And for y: ");
    scanf("%s", & y);
    q=x*y;
    writefln("result: %s",q);
    return 0;

}

If for example I enter value "a" and "d" I have got error
result: Error: 4invalid UTF-8 sequence
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Sun Apr 08, 2007 3:57 am    Post subject: Reply with quote
And new question
Code:

import std.stdio;
void main() {
    char[] s;

    scanf("%s", & s);
    writefln("%s", s);

}

I've got error "Error: Access Violation"
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Bradley Smith



Joined: 20 Jun 2006
Posts: 60
PostPosted: Sun Apr 08, 2007 3:42 pm    Post subject: Reply with quote
The C library scanf is used because std.stdio contains the following:

Code:
public import std.c.stdio;



Therefore, a char* must be passed to scanf. For example,

Code:
import std.stdio;
import std.c.string;

void main(char[][] args)
{
   char[1024] buffer;
   scanf("%s", buffer.ptr);
   char[] input = buffer[0 .. strlen(buffer.ptr)];
   writef("%s", input);
}
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Rohan



Joined: 05 Jan 2007
Posts: 22
PostPosted: Sat May 05, 2007 5:42 am    Post subject: Reply with quote
How I can write this C string in D?
Code:
count << (char) i;
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jcc7



Joined: 22 Feb 2004
Posts: 657
Location: Muskogee, OK, USA
PostPosted: Thu May 10, 2007 12:41 pm    Post subject: Reply with quote
Rohan wrote:
How I can write this C string in D?
Code:
count << (char) i;
For those of us that don't know C/C++ (but do know some D), could you explain what you're trying to do?

Are you trying to take a char[] as input, and then store it as an integer or floating-point number?
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davidb



Joined: 03 Apr 2007
Posts: 15
PostPosted: Fri May 11, 2007 3:24 pm    Post subject: Reply with quote
@Rohan:
Because your previous posts were console i/o related, I assume you meant "cout" instead of "count"?
(And I assume "i" is an int?)
Then you can use
Code:

   int i = 65;
   writefln(cast (char) i);

which prints 'A' to the console.

@jcc7:
Code:

   cout << whatever;

passes "whatever" to the standard Console OUTput stream ("cin >> whatever" is the equivalent,
reads from Standard INput stream and writes the data to "whatever"). "(char)" is an explicit cast,
"cast (char)" in D (although I don't think that was the part you asked after).

david
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Rommie



Joined: 23 Aug 2007
Posts: 6
PostPosted: Thu Aug 23, 2007 3:55 pm    Post subject: Reply with quote
Rohan wrote:
How I can write this C string in D?
Code:
cout << (char) i;

writef(cast(char)i);

Rommie
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