dev-cpp-users

[Dev-C++] C vs C++

[Gregor P. <pe...@in...>]

My Compiler complains about the following codelines

lineNo: c-code
     59: char *currentObjName = calloc( 100, sizeof( char ) );
     60: char *token1         = calloc(  25, sizeof( char ) );
     63: char *mltext, *ptext, *str;
     64: mltext = malloc( 10*sizeof(char));
    318: mltext = realloc( mltext, (strlen(mltext)+yyleng)*sizeof(char) );
    329: mltext = realloc( mltext, (strlen(mltext)+1)*sizeof(char) );
	
The compilers errmsg is:

    SCANNER.LEX:'lineNo': ANSI C++ forbids implicit conversion from
    `void *' in initialization


Can tell me someone how to rewrite this ANSI C++ compatible?

THANX
	Gregor	(pe...@in...)

RE: [Dev-C++] C vs C++

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Gregor Peter
> Sent: Wednesday, November 07, 2001 7:21 AM
> To: dev...@li...
> Subject: [Dev-C++] C vs C++
> Importance: High
> 
> 
> My Compiler complains about the following codelines
> 
> lineNo: c-code
>      59: char *currentObjName = calloc( 100, sizeof( char ) );

char *currentObjName=new char[100];
memset(currentObjName, 0, 100); // makes all zeros

>      64: mltext = malloc( 10*sizeof(char));
mletext=new char[10];


>     318: mltext = realloc( mltext, 
> (strlen(mltext)+yyleng)*sizeof(char) );

You use wring approach, use string type defined in <string>



Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

Re: [Dev-C++] C vs C++

[Jason H. <jas...@bt...>]

The reason you get that problem is because you now have to cast a void
pointer into the type you are using, and the old C style dynamic allocation
functions will always return a void pointer as they have no way of
determining the type of the value returned. i.e.

char *currentObjName = static_cast<char*>(calloc(100, sizeof(char)));

or if you are using C only you can use the old style cast: (char*)

for C++... yes you can use strings, but you can also use the new and delete
(or delete[]) operators. Strings are better for simplicity of use.

Jason.

----- Original Message -----
From: "Gregor Peter" <pe...@in...>
To: <dev...@li...>
Sent: Wednesday, November 07, 2001 5:21 AM
Subject: [Dev-C++] C vs C++


> My Compiler complains about the following codelines
>
> lineNo: c-code
>      59: char *currentObjName = calloc( 100, sizeof( char ) );
>      60: char *token1         = calloc(  25, sizeof( char ) );
>      63: char *mltext, *ptext, *str;
>      64: mltext = malloc( 10*sizeof(char));
>     318: mltext = realloc( mltext, (strlen(mltext)+yyleng)*sizeof(char) );
>     329: mltext = realloc( mltext, (strlen(mltext)+1)*sizeof(char) );
>
> The compilers errmsg is:
>
>     SCANNER.LEX:'lineNo': ANSI C++ forbids implicit conversion from
>     `void *' in initialization
>
>
> Can tell me someone how to rewrite this ANSI C++ compatible?
>
> THANX
> Gregor (pe...@in...)
>
>
>
>
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