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Inglid Felix
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 Posted: Fri Dec 12, 2003 9:51 am Post subject: Need a help on this compiler driver |
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Can someone look at my compiler driver and tell me why is not working.
Please let me know what I need to do to make it work. Thanks.
//calculator.cpp
#include "symboltable.h"
#include "scanner.h"
#include "parser.h"
#include <iostream>
using std::cin;
using std::cout;
int main()
{
Symbol("pi") = 3.1415926535897932385;
Symbol("e") = 2.7182818284590452354;
while(cin)
{
GetToken();
if(currentToken == END) break;
if(currentToken == PRINT) continue;
cout << Expression(false) << 'n';
}
}
---------------------------------------------
Here is the error that I am getting:
Compiling...
calculator.cpp
c:testscannerandparsercalculator.cpp(23) : warning C4508: 'main' :
function should return a value; 'void' return type assumed
Linking...
calculator.obj : error LNK2001: unresolved external symbol "double
__cdecl Expression(bool)" (?Expression@@YAN_N@Z)
calculator.obj : error LNK2001: unresolved external symbol "enum Token
currentToken" (?currentToken@@3W4Token@@A)
calculator.obj : error LNK2001: unresolved external symbol "enum Token
__cdecl GetToken(void)" (?GetToken@@YA?AW4Token@@XZ)
calculator.obj : error LNK2001: unresolved external symbol "double &
__cdecl Symbol(class std::basic_string
std::char_traits)"
(?Symbol@@YAAANV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std
@@@Z)
Debug/calculator.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.
calculator.exe - 5 error(s), 1 warning(s)
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Francis Glassborow
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| Posted: Fri Dec 12, 2003 6:31 pm Post subject: Re: Need a help on this compiler driver |
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In article <b2349c95.0312111937.66098799 (AT) posting (DOT) google.com>, Inglid
Felix <ingafe (AT) hotmail (DOT) com> writes
| Quote: | Can someone look at my compiler driver and tell me why is not working.
Please let me know what I need to do to make it work. Thanks.
//calculator.cpp
#include "symboltable.h"
#include "scanner.h"
#include "parser.h"
|
As the above form part of the context of the following we cannot see
what the compiler sees.
| Quote: | #include
using std::cin;
using std::cout;
int main()
{
Symbol("pi") = 3.1415926535897932385;
Symbol("e") = 2.7182818284590452354;
|
Is an understanding of these lines necessary to your question? Can't
they simply be omitted?
So how do you intend to end input? If input can fail I think that should
be explicitly handled, if it cannot then use while(true) to signify that
the loop has an internal break.
| Quote: | {
GetToken();
if(currentToken == END) break;
if(currentToken == PRINT) continue;
|
To understand a failure to compile the above we would need to know more
than you have shown.
| Quote: | cout << Expression(false) << 'n';
}
}
---------------------------------------------
Here is the error that I am getting:
Compiling...
calculator.cpp
c:testscannerandparsercalculator.cpp(23) : warning C4508: 'main' :
function should return a value; 'void' return type assumed
|
So you are not using a conforming compiler (Looks like one of the
earlier versions of VC++)
This has nothing to do with compilation but is complaining that you have
reneged on the promises made in your header files where various things
were declared. Looks like you have not provided relevant implementation
files for the things declared or classes defined in your header files.
--
Francis Glassborow ACCU
Author of 'You Can Do It!' see http://www.spellen.org/youcandoit
or http://www.robinton.demon.co.uk
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
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Tom
Guest
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| Posted: Sat Dec 13, 2003 2:21 am Post subject: Re: Need a help on this compiler driver |
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[email]ingafe (AT) hotmail (DOT) com[/email] (Inglid Felix) wrote:
| Quote: | Can someone look at my compiler driver and tell me why is not working.
|
Short answer: because you haven't provided code for "symboltable.h",
"scanner.h", or "parser.h"
| Quote: | Please let me know what I need to do to make it work.
|
Short answer: provide working code for "symboltable.h", "scanner.h",
or "parser.h"
Longer answer below.
| Quote: | //calculator.cpp
#include "symboltable.h"
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What is this?
| Quote: | #include "scanner.h"
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What is this?
| Quote: | #include "parser.h"
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What is this?
| Quote: | #include <iostream
using std::cin;
using std::cout;
int main()
{
Symbol("pi") = 3.1415926535897932385;
Symbol("e") = 2.7182818284590452354;
|
What is a Symbol? Where is it defined?
| Quote: | while(cin)
{
GetToken();
|
What is GetToken()? Where is it defined?
| Quote: | if(currentToken == END) break;
|
What is currentToken? Where is it defined? What is END? Where is it
defined?
| Quote: | if(currentToken == PRINT) continue;
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What is PRINT? Where is it defined?
| Quote: | cout << Expression(false) << 'n';
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What is Expression(bool)? Where is it defined?
| Quote: | }
}
---------------------------------------------
Here is the error that I am getting:
Compiling...
calculator.cpp
c:testscannerandparsercalculator.cpp(23) : warning C4508: 'main' :
function should return a value;
|
What compiler are you using? It should not generate this warning, but
perhaps there is something in one of the headers that you have chosen
not to share with us that is causing this to occur.
| Quote: | 'void' return type assumed
Linking...
calculator.obj : error LNK2001: unresolved external symbol "double
__cdecl Expression(bool)" (?Expression@@YAN_N@Z)
|
Here the linker is asking you "where is Expression(bool) defined?" So
what's the answer?
| Quote: | calculator.obj : error LNK2001: unresolved external symbol "enum Token
currentToken" (?currentToken@@3W4Token@@A)
|
Here the linker is asking you "Where is enum Token currentToken
defined?" What's your answer?
| Quote: | calculator.obj : error LNK2001: unresolved external symbol "enum Token
__cdecl GetToken(void)" (?GetToken@@YA?AW4Token@@XZ)
|
Here the linker is asking you "Where is enum Token GetToken()
defined?" What's the answer?
| Quote: | calculator.obj : error LNK2001: unresolved external symbol "double &
__cdecl Symbol(class std::basic_string
std::char_traits)"
(?Symbol@@YAAANV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std
@@@Z)
|
And here the linker is asking you - not particularly articulately -
"Where is the definition for Symbol(std::string)?" And where is it?
| Quote: | Debug/calculator.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.
calculator.exe - 5 error(s), 1 warning(s)
|
There's an FAQ that will help you out quite a bit, I think. Take a
look at:
http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8
I think you'll find items 1, 2, 4, 5, and 6 to be particularly
pertinent.
Best regards,
Tom
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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