Run time error?

Dear All,
I am getting Run Time Error In Following code, what could be the problem?

Code:

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>

main ( )
{
char *str1 = "hS eesll snsiasl not eh es as oher " ;
char *str2 ;
swab ( str1, str2, strlen ( str1 ) ) ;
printf ( "The target string is : %s\n", str2 ) ; // output -- She sells snails on the a shore
return 0;
}

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Thanks for Help.

You didn't allocate memory for str2. It might be pointing anywhere.

What is swab()? It's not a standard function, and you haven't defined it.

Quote:

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Originally Posted by cpjust

What is swab()? It's not a standard function, and you haven't defined it.

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swab is a library function declared in the header stdlib.h.its syntax is

Code:

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void swab(char *from,char *to,int nbytes)

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swab copies nbytes bytes from the "from" string to the "to" string.nbytes should be even.

Looks like it's POSIX, not ISO, but normally found in unistd.h instead of stdlib.h:

http://en.wikipedia.org/wiki/Swab_(programming)

and btw

str1 should be "hS eesll snsiaslo nht e ahsro e " for your output...

Sounds like swab() is a less standard version of the htonl(), htons(), ntohl() & ntohs() functions.