digitalmars.D.learn - short programme from "Programming in D" by Ali Cehreli.
- Nick B (70/70) Jun 14 2016 Hi, Can anyone assist me with the short D programme. It is taken
- cym13 (2/7) Jun 14 2016 Misplaced quote in your readf.
- Nick B (2/10) Jun 14 2016 Thank you. Question: is this a compiler bug ?
- cym13 (11/22) Jun 14 2016 No, why would it? You gave it a string saying "Hey, the store the
- Nick B (3/15) Jun 14 2016 Thanks for the assistance. I assumed that the compiler would at
- Steven Schveighoffer (38/56) Jun 14 2016 You should see a stack trace. I'm not normally on windows, so I don't
- =?UTF-8?Q?Ali_=c3=87ehreli?= (9/11) Jun 14 2016 Further, when the format string is a literal like the one used in the
- Steven Schveighoffer (3/13) Jun 14 2016 Hm... shouldn't it at least require ONE parameter besides the string?
- =?UTF-8?Q?Ali_=c3=87ehreli?= (11/19) Jun 14 2016 Good idea in this case but I think the real issue is providing this
- Nick B (4/20) Jun 15 2016 I will log a feature request with Walter.
Hi, Can anyone assist me with the short D programme. It is taken
straight from "Programming in D" by Ali Cehreli. The code below
is the solution, on page 684.
The Exercise is on Page 27, item 2 half way down the page.
The problem is that the program crashes, when it runs. The only
thing I have changed is the placement of the curly brackets on
new lines, otherwise the code is the same. My text editor is
Sublime 3 - Build 3114.
DMD32 D Compiler v2.069.2
Running on Win 7
result:
Microsoft Windows [Version 6.1.7601]
DMD32 D Compiler v2.069.2
C:\Users\Joan\Prog\Source>page27b
Roll the dice .....
3
object.Exception C:\Users\Joan\Prog\D\dmd2\windows\bin\..\..\src\phobos\std\form
at.d(594): Enforcement failed
----------------
0x00403849
0x004037F4
0x0040251F
0x00402472
0x0040858F
0x00408553
0x00408454
0x00404C83
0x76DA338A in BaseThreadInitThunk
0x777B9902 in RtlInitializeExceptionChain
0x777B98D5 in RtlInitializeExceptionChain
C:\Users\Joan\Prog\Source>
***************************************************
Here is all the source:
import std.stdio;
void main ()
{
writeln ("Roll the dice .....");
int die ;
readf (" %s, &die");
if ((die == 1) || (die == 2) || (die == 3))
{
writeln("You won");
}
else if ((die == 4) || (die == 5) || (die == 6))
{
writeln("I won");
}
else
{
writeln("ERROR: ", die , "is invalid");
}
}
Note, this source below, take from the code samples .zip file
works correctly !!
module if_solution_3;
import std.stdio;
void main() {
write("What is the value of the die? ");
int die;
readf(" %s", &die);
if ((die == 1) || (die == 2) || (die == 3)) {
writeln("You won");
} else if ((die == 4) || (die == 5) || (die == 6)) {
writeln("I won");
} else {
writeln("ERROR: ", die, " is invalid");
}
}
with Thanks
Nick
Jun 14 2016
On Tuesday, 14 June 2016 at 09:17:35 UTC, Nick B wrote:Hi, Can anyone assist me with the short D programme. It is taken straight from "Programming in D" by Ali Cehreli. The code below is the solution, on page 684. The Exercise is on Page 27, item 2 half way down the page. [...]Misplaced quote in your readf.
Jun 14 2016
On Tuesday, 14 June 2016 at 09:28:18 UTC, cym13 wrote:On Tuesday, 14 June 2016 at 09:17:35 UTC, Nick B wrote:Thank you. Question: is this a compiler bug ?Hi, Can anyone assist me with the short D programme. It is taken straight from "Programming in D" by Ali Cehreli. The code below is the solution, on page 684. The Exercise is on Page 27, item 2 half way down the page. [...]Misplaced quote in your readf.
Jun 14 2016
On Tuesday, 14 June 2016 at 09:39:05 UTC, Nick B wrote:On Tuesday, 14 June 2016 at 09:28:18 UTC, cym13 wrote:No, why would it? You gave it a string saying "Hey, the store the data in the next variable" then gave no such variable. Format detected it and rightfully threw an error. That's the following line from your paste: object.Exception C:\Users\Joan\Prog\D\dmd2\windows\bin\..\..\src\phobos\std\form at.d(594): Enforcement failed It then printed as much of a stack trace as it could, not very useful as you didn't do much but it's there. You gave it garbage and it threw an error. Compiler bugs are a reality but not *that* common ;-)On Tuesday, 14 June 2016 at 09:17:35 UTC, Nick B wrote:Thank you. Question: is this a compiler bug ?Hi, Can anyone assist me with the short D programme. It is taken straight from "Programming in D" by Ali Cehreli. The code below is the solution, on page 684. The Exercise is on Page 27, item 2 half way down the page. [...]Misplaced quote in your readf.
Jun 14 2016
On Tuesday, 14 June 2016 at 09:53:03 UTC, cym13 wrote:On Tuesday, 14 June 2016 at 09:39:05 UTC, Nick B wrote:Thanks for the assistance. I assumed that the compiler would at least throw a line number, to hint at where the problem was.On Tuesday, 14 June 2016 at 09:28:18 UTC, cym13 wrote:It then printed as much of a stack trace as it could, not very useful as you didn't do much but it's there. You gave it garbage and it threw an error. Compiler bugs are a reality but not *that* common ;-)On Tuesday, 14 June 2016 at 09:17:35 UTC, Nick B wrote:[snip]Hi, Can anyone assist me with the short D programme. It is taken straight from "Programming in D" by Ali Cehreli. The code below is the solution, on page 684. The Exercise is on Page 27, item 2 half way down the page.
Jun 14 2016
Steven Schveighoffer <schveiguy yahoo.com> On 6/14/16 7:52 AM, Nick B wrote:On Tuesday, 14 June 2016 at 09:53:03 UTC, cym13 wrote:You should see a stack trace. I'm not normally on windows, so I don't know the proper mechanism to enable stack traces, but on OSX, it looks like this: object.Exception /Users/steves/.dvm/compilers/dmd-2.071.0/osx/bin/../../src/phobo /std/format.d(596): Trailing characters in formattedRead format string ---------------- 4 testdice 0x00000001013a2357 pure safe void std.exception.bailOut!(Exception).bailOut(immutable(char)[], ulong, const(char[])) + 123 5 testdice 0x00000001013a22d0 pure safe bool std.exception.enforce!(Exception, bool).enforce(bool, lazy const(char)[], immutable(char)[], ulong) + 100 6 testdice 0x00000001013a0978 uint std.format.formattedRead!(std.stdio.LockingTextReader, char).formattedRead(ref std.stdio.LockingTextReader, const(char)[]) + 124 7 testdice 0x00000001013a08b9 uint std.stdio.File.readf!().readf(const(char[])) + 197 8 testdice 0x00000001013a07ea uint std.stdio.readf!().readf(const(char[])) + 38 9 testdice 0x00000001013a0264 _Dmain + 52 10 testdice 0x00000001013c07eb D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv + 39 11 testdice 0x00000001013c071f void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) + 35 12 testdice 0x00000001013c0790 void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() + 44 13 testdice 0x00000001013c071f void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) + 35 14 testdice 0x00000001013c0685 _d_run_main + 497 15 testdice 0x00000001013a037f main + 15 16 libdyld.dylib 0x00007fff987e75ac start + 0 17 ??? 0x0000000000000000 0x0 + 0 No line numbers, but at least I can see the call stack. -SteveOn Tuesday, 14 June 2016 at 09:39:05 UTC, Nick B wrote:Thanks for the assistance. I assumed that the compiler would at least throw a line number, to hint at where the problem was.On Tuesday, 14 June 2016 at 09:28:18 UTC, cym13 wrote:It then printed as much of a stack trace as it could, not very useful as you didn't do much but it's there. You gave it garbage and it threw an error. Compiler bugs are a reality but not *that* common ;-)On Tuesday, 14 June 2016 at 09:17:35 UTC, Nick B wrote:[snip]Hi, Can anyone assist me with the short D programme. It is taken straight from "Programming in D" by Ali Cehreli. The code below is the solution, on page 684. The Exercise is on Page 27, item 2 half way down the page.
Jun 14 2016
On 06/14/2016 04:52 AM, Nick B wrote:Thanks for the assistance. I assumed that the compiler would at least throw a line number, to hint at where the problem was.Further, when the format string is a literal like the one used in the program, the compiler can in theory determine at compile time that the format string does not match the rest of the arguments: readf (" %s, &die"); // "No argument for %s" This is a desired feature but dmd does not have this yet. Since dmd provides the front end to gdc and ldc, they don't have this feature either. Ali
Jun 14 2016
On 6/14/16 11:44 AM, Ali Çehreli wrote:On 06/14/2016 04:52 AM, Nick B wrote:Hm... shouldn't it at least require ONE parameter besides the string? -SteveThanks for the assistance. I assumed that the compiler would at least throw a line number, to hint at where the problem was.Further, when the format string is a literal like the one used in the program, the compiler can in theory determine at compile time that the format string does not match the rest of the arguments: readf (" %s, &die"); // "No argument for %s" This is a desired feature but dmd does not have this yet. Since dmd provides the front end to gdc and ldc, they don't have this feature either.
Jun 14 2016
On 06/14/2016 09:09 AM, Steven Schveighoffer wrote:Good idea in this case but I think the real issue is providing this support for user-defined functions as well. bool argument_check_function(/* ... */) { // ... } pragma(arg_check, argument_check_function) int foo(int, string); I guess it's possible to do something with UDAs as well but the check must happen at call sites, which I think UDAs can't reach. Alireadf (" %s, &die"); // "No argument for %s" This is a desired feature but dmd does not have this yet. Since dmd provides the front end to gdc and ldc, they don't have this feature either.Hm... shouldn't it at least require ONE parameter besides the string? -Steve
Jun 14 2016
On Tuesday, 14 June 2016 at 16:09:00 UTC, Steven Schveighoffer wrote:On 6/14/16 11:44 AM, Ali Çehreli wrote:On 06/14/2016 04:52 AM, Nick B wrote:I will log a feature request with Walter. NickFurther, when the format string is a literal like the one used in the program, the compiler can in theory determine at compile time that the format string does not match the rest of the arguments: readf (" %s, &die"); // "No argument for %s" This is a desired feature but dmd does not have this yet. Since dmd provides the front end to gdc and ldc, they don't have this feature either.
Jun 15 2016