• Örk <Örk_member pathlink.com> Jan 08 2004
• J C Calvarese <jcc7 cox.net> Jan 08 2004
• "C" <dont respond.com> Jan 08 2004
• kinghajj <kinghajj_member pathlink.com> Jan 08 2004
• J C Calvarese <jcc7 cox.net> Jan 08 2004
• "Robert" <no spam.ne.jp> Jan 09 2004
• "C" <dont respond.com> Jan 09 2004
• J C Calvarese <jcc7 cox.net> Jan 09 2004
• Andy Friesen <andy ikagames.com> Jan 09 2004
• Andy Friesen <andy ikagames.com> Jan 09 2004
• "Robert" <no spam.ne.jp> Jan 09 2004
• Ian Johnston <Ian_member pathlink.com> Jan 09 2004
• "Vathix" <vathix dprogramming.com> Jan 09 2004

Örk <Örk_member pathlink.com> writes:

How to use scanf in D ?

Or how to read integer and strings like in C with scanf ?

Örk

J C Calvarese <jcc7 cox.net> writes:

Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


Here's some webpages that might be helpful:
http://www.digitalmars.com/rtl/stdio.html#fscanf
http://www.cplusplus.com/ref/cstdio/scanf.html


Here's an example in D:

import std.c.stdio;

int main()
{
	const int answer = 10;
	float guess;
	int i;
	char[80] name;


	printf("Yo! What's your name? ");
	scanf("%s", &name);

	printf("Pick a whole number: ");
	scanf("%d", &i);
	printf("You picked %d as a whole number.\n\n", i);
	
	printf("Guess a number: ");
	scanf("%f", &guess);

	printf("\nHey, %.*s, ", name);

	if(cast(int) guess <> answer)

	if(answer == guess)
		printf("answer = %f.", guess);
	else if(answer > guess)
		printf("answer > guess.");
	else if(answer < guess)
	{
		printf("answer < guess.");
	}
	else
		printf("Dude, that wasn't a number.");
	printf("\n");

	return 0;
}



-- 
Justin
http://jcc_7.tripod.com/d/

"C" <dont respond.com> writes:

if(cast(int) guess <> answer)

?

is it vb uses that as a != operator ?

C

"J C Calvarese" <jcc7 cox.net> wrote in message
news:btl20o$1id1$1 digitaldaemon.com...
 Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


 Here's some webpages that might be helpful:
 http://www.digitalmars.com/rtl/stdio.html#fscanf
 http://www.cplusplus.com/ref/cstdio/scanf.html


 Here's an example in D:

 import std.c.stdio;

 int main()
 {
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);

 printf("Pick a whole number: ");
 scanf("%d", &i);
 printf("You picked %d as a whole number.\n\n", i);

 printf("Guess a number: ");
 scanf("%f", &guess);

 printf("\nHey, %.*s, ", name);

 if(cast(int) guess <> answer)

 if(answer == guess)
 printf("answer = %f.", guess);
 else if(answer > guess)
 printf("answer > guess.");
 else if(answer < guess)
 {
 printf("answer < guess.");
 }
 else
 printf("Dude, that wasn't a number.");
 printf("\n");

 return 0;
 }



 --
 Justin
 http://jcc_7.tripod.com/d/

kinghajj <kinghajj_member pathlink.com> writes:

SQL does :\

In article <btlb1d$1vtl$1 digitaldaemon.com>, C says...
if(cast(int) guess <> answer)

?

is it vb uses that as a != operator ?

C

"J C Calvarese" <jcc7 cox.net> wrote in message
news:btl20o$1id1$1 digitaldaemon.com...
 Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


 Here's some webpages that might be helpful:
 http://www.digitalmars.com/rtl/stdio.html#fscanf
 http://www.cplusplus.com/ref/cstdio/scanf.html


 Here's an example in D:

 import std.c.stdio;

 int main()
 {
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);

 printf("Pick a whole number: ");
 scanf("%d", &i);
 printf("You picked %d as a whole number.\n\n", i);

 printf("Guess a number: ");
 scanf("%f", &guess);

 printf("\nHey, %.*s, ", name);

 if(cast(int) guess <> answer)

 if(answer == guess)
 printf("answer = %f.", guess);
 else if(answer > guess)
 printf("answer > guess.");
 else if(answer < guess)
 {
 printf("answer < guess.");
 }
 else
 printf("Dude, that wasn't a number.");
 printf("\n");

 return 0;
 }



 --
 Justin
 http://jcc_7.tripod.com/d/

J C Calvarese <jcc7 cox.net> writes:

C wrote:
 if(cast(int) guess <> answer)


compiler should flag that as an error.

 
 ?
 
 is it vb uses that as a != operator ?


when I was programming in Pascal and QBasic at the same time.)

 
 C
 
 "J C Calvarese" <jcc7 cox.net> wrote in message
 news:btl20o$1id1$1 digitaldaemon.com...
 
Örk wrote:

How to use scanf in D ?
Or how to read integer and strings like in C with scanf ?
Örk


Here's some webpages that might be helpful:
http://www.digitalmars.com/rtl/stdio.html#fscanf
http://www.cplusplus.com/ref/cstdio/scanf.html


Here's an example in D:

import std.c.stdio;

int main()
{
const int answer = 10;
float guess;
int i;
char[80] name;


printf("Yo! What's your name? ");
scanf("%s", &name);

printf("Pick a whole number: ");
scanf("%d", &i);
printf("You picked %d as a whole number.\n\n", i);

printf("Guess a number: ");
scanf("%f", &guess);

printf("\nHey, %.*s, ", name);

if(cast(int) guess <> answer)

if(answer == guess)
printf("answer = %f.", guess);
else if(answer > guess)
printf("answer > guess.");
else if(answer < guess)
{
printf("answer < guess.");
}
else
printf("Dude, that wasn't a number.");
printf("\n");

return 0;
}




-- 
Justin
http://jcc_7.tripod.com/d/

"Robert" <no spam.ne.jp> writes:

"<>" is a valid D operator,
equivalent to "!=" unless one or both of operands is a NaN.

"C" <dont respond.com> wrote in message
news:btlb1d$1vtl$1 digitaldaemon.com...
 if(cast(int) guess <> answer)

 ?

 is it vb uses that as a != operator ?

 C

 "J C Calvarese" <jcc7 cox.net> wrote in message
 news:btl20o$1id1$1 digitaldaemon.com...
 Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


 Here's some webpages that might be helpful:
 http://www.digitalmars.com/rtl/stdio.html#fscanf
 http://www.cplusplus.com/ref/cstdio/scanf.html


 Here's an example in D:

 import std.c.stdio;

 int main()
 {
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);

 printf("Pick a whole number: ");
 scanf("%d", &i);
 printf("You picked %d as a whole number.\n\n", i);

 printf("Guess a number: ");
 scanf("%f", &guess);

 printf("\nHey, %.*s, ", name);

 if(cast(int) guess <> answer)

 if(answer == guess)
 printf("answer = %f.", guess);
 else if(answer > guess)
 printf("answer > guess.");
 else if(answer < guess)
 {
 printf("answer < guess.");
 }
 else
 printf("Dude, that wasn't a number.");
 printf("\n");

 return 0;
 }



 --
 Justin
 http://jcc_7.tripod.com/d/

"C" <dont respond.com> writes:

Hmm, when I compile this

import std.c.stdio;

void main () {

 if ( 0 <> 1 ) puts("true");

}

it fails with :

Assertion failure: '0' on line 487 in file 'constfold.c'

abnormal program termination

however != works fine.

?

C

"Robert" <no spam.ne.jp> wrote in message
news:btlsfh$2roq$1 digitaldaemon.com...
 "<>" is a valid D operator,
 equivalent to "!=" unless one or both of operands is a NaN.

 "C" <dont respond.com> wrote in message
 news:btlb1d$1vtl$1 digitaldaemon.com...
 if(cast(int) guess <> answer)

 ?

 is it vb uses that as a != operator ?

 C

 "J C Calvarese" <jcc7 cox.net> wrote in message
 news:btl20o$1id1$1 digitaldaemon.com...
 Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


 Here's some webpages that might be helpful:
 http://www.digitalmars.com/rtl/stdio.html#fscanf
 http://www.cplusplus.com/ref/cstdio/scanf.html


 Here's an example in D:

 import std.c.stdio;

 int main()
 {
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);

 printf("Pick a whole number: ");
 scanf("%d", &i);
 printf("You picked %d as a whole number.\n\n", i);

 printf("Guess a number: ");
 scanf("%f", &guess);

 printf("\nHey, %.*s, ", name);

 if(cast(int) guess <> answer)

 if(answer == guess)
 printf("answer = %f.", guess);
 else if(answer > guess)
 printf("answer > guess.");
 else if(answer < guess)
 {
 printf("answer < guess.");
 }
 else
 printf("Dude, that wasn't a number.");
 printf("\n");

 return 0;
 }



 --
 Justin
 http://jcc_7.tripod.com/d/

J C Calvarese <jcc7 cox.net> writes:

It seems to me that the Specification is unclear about this
(http://www.digitalmars.com/d/expression.html), but <> seemed to be intended to
be used with floating-point numbers (rather than integers such as 0 and 1).

That error message seems very vague.  (Might be a candidate for a bug report
based on the error message if nothing else.)

Justin


In article <btmpmj$171k$1 digitaldaemon.com>, C says...
Hmm, when I compile this

import std.c.stdio;
void main () {
 if ( 0 <> 1 ) puts("true");
}

it fails with :

Assertion failure: '0' on line 487 in file 'constfold.c'
abnormal program termination
however != works fine.
?
C

Andy Friesen <andy ikagames.com> writes:

C wrote:
 Hmm, when I compile this
 
 import std.c.stdio;
 
 void main () {
 
  if ( 0 <> 1 ) puts("true");
 
 }
 
 it fails with :
 
 Assertion failure: '0' on line 487 in file 'constfold.c'
 
 abnormal program termination
 
 however != works fine.
 
 ?
 
 C


Now there's something people coming from BASIC will run into.

The D expression 'x <> y', when applied to integers, is equivalent to
'x == y'! (the exact opposite of what they think it means)

  -- andy

Andy Friesen <andy ikagames.com> writes:

Andy Friesen wrote:
 Now there's something people coming from BASIC will run into.
 
 The D expression 'x <> y', when applied to integers, is equivalent to
 'x == y'! (the exact opposite of what they think it means)
 
  -- andy


errrr wait.  No, I'm having a Monday. (on Friday!)

  -- andy

"Robert" <no spam.ne.jp> writes:

Hmm.  It seems "<>" is not supported in case of comparison of integers.
So, the integers may be implicitly casted to floating points and compared,
and it actually works when one or both operands are variables.
However, it causes the error when both operands are integer literals.

/* in "Expression *CmpExp::constFold()" in "constfold.c" */
480:    switch (op)
481:    {
482:        case TOKlt:     n = n1 <  n2;   break;
483:        case TOKle:     n = n1 <= n2;   break;
484:        case TOKgt:     n = n1 >  n2;   break;
485:        case TOKge:     n = n1 >= n2;   break;
486:        default:
487:            assert(0);  /* <- Here! */
488:    }

I guess that this function analyses a relational expression of two integer
literals.
But, it doesn't take into account "<>", "<>=", etc.



"C" <dont respond.com> wrote in message
news:btmpmj$171k$1 digitaldaemon.com...
 Hmm, when I compile this

 import std.c.stdio;

 void main () {

  if ( 0 <> 1 ) puts("true");

 }

 it fails with :

 Assertion failure: '0' on line 487 in file 'constfold.c'

 abnormal program termination

 however != works fine.

 ?

 C

 "Robert" <no spam.ne.jp> wrote in message
 news:btlsfh$2roq$1 digitaldaemon.com...
 "<>" is a valid D operator,
 equivalent to "!=" unless one or both of operands is a NaN.

 "C" <dont respond.com> wrote in message
 news:btlb1d$1vtl$1 digitaldaemon.com...
 if(cast(int) guess <> answer)

 ?

 is it vb uses that as a != operator ?

 C

 "J C Calvarese" <jcc7 cox.net> wrote in message
 news:btl20o$1id1$1 digitaldaemon.com...
 Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


 Here's some webpages that might be helpful:
 http://www.digitalmars.com/rtl/stdio.html#fscanf
 http://www.cplusplus.com/ref/cstdio/scanf.html


 Here's an example in D:

 import std.c.stdio;

 int main()
 {
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);

 printf("Pick a whole number: ");
 scanf("%d", &i);
 printf("You picked %d as a whole number.\n\n", i);

 printf("Guess a number: ");
 scanf("%f", &guess);

 printf("\nHey, %.*s, ", name);

 if(cast(int) guess <> answer)

 if(answer == guess)
 printf("answer = %f.", guess);
 else if(answer > guess)
 printf("answer > guess.");
 else if(answer < guess)
 {
 printf("answer < guess.");
 }
 else
 printf("Dude, that wasn't a number.");
 printf("\n");

 return 0;
 }



 --
 Justin
 http://jcc_7.tripod.com/d/

Ian Johnston <Ian_member pathlink.com> writes:

In article <btl20o$1id1$1 digitaldaemon.com>, J C Calvarese says...
Örk wrote:
 How to use scanf in D ?
 Or how to read integer and strings like in C with scanf ?
 Örk


Here's some webpages that might be helpful:
http://www.digitalmars.com/rtl/stdio.html#fscanf
http://www.cplusplus.com/ref/cstdio/scanf.html


Here's an example in D:

import std.c.stdio;

int main()
{
	const int answer = 10;
	float guess;
	int i;
	char[80] name;


	printf("Yo! What's your name? ");
	scanf("%s", &name);


What happens here if the users enters a string longer than 80 characters?

Ian

"Vathix" <vathix dprogramming.com> writes:

int main()
{
 const int answer = 10;
 float guess;
 int i;
 char[80] name;


 printf("Yo! What's your name? ");
 scanf("%s", &name);


 What happens here if the users enters a string longer than 80 characters?

 Ian


It would write past the end, try this:
char[80] name;
printf("Yo! What's your name? ");
scanf("%79s", cast(char*)name);
printf("Your name is %s\n", cast(char*)name);