Author: Matt Taylor
Date: 07:48:19 02/28/03
Go up one level in this thread
On February 27, 2003 at 09:55:35, Tom Likens wrote:
>On February 26, 2003 at 17:07:45, Bo Persson wrote:
>
>[--snip--]
>
>
>>>I see that I did not include data.h in data.c but it caused me no problem
>>>with c files
>>
>>You have found an actual difference between the languages!
>>
>>In C++, const variables are considered local unless declared otherwise. In C,
>>all global (file level) variables are extern by default.
>>
>>Bo Persson
>>bop2@telia.com
>
>
>No, no- C++ is just a superset of C. There is *absolutely*
>no differences between them :-) :-) :-) :-) :-) ;-)
>
>regards,
>--tom
Actually there are many subtle differences. Here's an example:
C:
int *array;
array = malloc(size);
C++:
int *array;
array = malloc(size); // error
array = (int *) malloc(size);
array = new int[size]; // preferred
Also, I have a fair amount of code that looks like this:
char *byteptr;
// some stuff
if (blah)
x = *((int *) byteptr)++;
else
x = (int) *byteptr++;
This does not work in C++. This example actually came from an x86 disassembler I
wrote where it was extremely convenient to break type rules again & again. The
only solution I have found in C++ is to use a union with pointers of varying
type.
You are right that most of C and C++ is the same, but some acceptable C programs
will not compile as C++ for various reasons.
-Matt
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