K & R 5-5 asks for a strncat function ( concat n characters of t);

void mystrncat(char *s, char *t, int n)

{

while ( *s++); /* find end of s */ /* <<<<< 1 */

/* stops at '\0' */ /* <<<<<2 */

while ( *t && n-- > 0)

*s++ = *t++; /* /*<<<<< 3 */

while ( n -- > 0);
*s++ = '\0';

}

Now, with 1 I **Thought** that *s++ fails when *s == '\0', so that s
points to '\0'.
So, when 3 occurs, I thought the first char of t ( *t) is assigned to
the "Old" position of s, which should be '\0', but it is not.
What am I missing.
Thanks in advance.

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Some postings in this newsgroup over the past few months have questioned the
popularity of the C programming language.

For what it's worth, the ``Reader's Choice Awards 2008'' from _Linux
Journal_ shows that C was voted the favorite programming language, slightly
ahead of both C++ and Java:

http://www.linuxjournal.com/article/10065

My experience on the Linux platform is that C is still widely used, not just
in the kernel and device drivers but also in userland, too.

Here is the code:

http://pastebin.com/m4a405e67

One advantage to using a region allocator is that you can usually skip most
calls to free. Instead you can merge multiple free calls into a single reset
call. Here is simple example:
___________________________________________________________________
int main(void) {
allocator this_allocator;

Hi I'm using Dev-C++.

Here is my sourcecode.

/* GETCH.C: This program reads characters from
* the keyboard until it receives a 'Y' or 'y'.
*/

#include
#include

void main( void )
{
int ch;

_cputs( "Type 'Y' when finished typing keys: " );
do
{
ch = _getch();
ch = toupper( ch );
} while( ch != 'Y' );

The code below can't be compiled:

typedef char* POINTER;
const POINTER ptr;
ptr++;

The compiler (Sun C 5.8 Patch 121015-04 2007/01/10) complains:

"test.c", line ...: operand must be modifiable lvalue: op "++"

It looks like the "const POINTER" has been compiled to "char* const".
A question is - why?

Best wishes,
Alex

A site for all your C/C++ programming language needs. Find more
details on code implementation, flow chart preparation and many more

http://www.blogonprogramming.blogspot.com
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