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posted by  John786 on 11/1/2009 5:16:50 PM  |  status: Closed  |  Earned Karma: 235

C++ Function (urgent)

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N/A N/A N/A N/A 11/4/2009 at 4:00:00 PM
Question Details:
Let f be the following C++ function:

void f (char *p)
{
     char *q = p;

     while (*q)
q++;
     while (p < q) {
char ch = *p;
*p++ = *--q
*q = ch;
      }
}


Assume that the argument to f is C-style (null-terminated) string.

A) What modification does f perform to the string that is passed to it?
B) Explain how f works.

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posted by John786 on 11/2/2009 9:44:35 PM  |  status: Live
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Please Help Someone 
Oracle
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posted by rapunzel on 11/2/2009 10:03:14 PM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:
please rate - thanks

the characters in the string are reveres
if enter the function with abcd
exit with
dcba

starts at the beginning of the string and q steps through the string until it gets to the end
starting with the first and  last characters in the string
it  swaps the end characters  moves in one character on each side swaps them keeps moving in and swapping 1characters until the 2 pointers cross each others paths

(hope this makes sense)
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