reverse of string in c with temp variable

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hi all,
i have a code of c which is below.This code is reverse to string.my question is that in while loop when l=p c si siht and p=p c si siht control return from the rev function
void rev(char *l,char *p)
{
}
then how to reverse the some word i mean rogramming. i am unable to undestand.

C#

#include "stdafx.h"
#include "string.h"
#include "malloc.h"
void rev(char *,char *);
int _tmain(int argc, _TCHAR* argv[])
{
    char a[]="this is c programming";
    char *end;

    for(end=a; *end; end++)
       ;

    rev(a, end-1);
    printf("%s",a);
    return 0;
}

void rev(char *l, char *p)
{
    char t;
    while(l < p)
    {
        t=*l;
        *l++ =*p;
        *p-- =t;
    }

}

Please help me.

Thanks

Posted 1-Aug-13 9:57am

Tn1111

Updated 1-Aug-13 11:29am

nv3

v2

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Mohibur Rashid · Answer 1 · 2013-08-01T15:08:00

Solution 2

no, your observation is wrong.

First to understand this you need to debug your program and see what happened.

And you are sending two pointer l and p. l is a non fractional number as well as p. l increases p decreases. They do it at the same time.

So the while loop continues as long as l is less than p. If l become equal to p(when the length of the string is even. ) or l is bigger than p(when the length of string is odd) the loop ends.

Finally, do the debug!!

Posted 1-Aug-13 15:08pm

Mohibur Rashid

Comments

[no name] 1-Aug-13 21:31pm

Forget my previous comment. I think you are saying there is nothing wrong with the code (functionally). I agree.

Mohibur Rashid 1-Aug-13 23:56pm

He has a question. The way he wrote is very hard to understand. but he has a question, the question is:
when the function returns? he pointed out whether :
at: l="p c si siht"
and
at p="p c si siht"

i.e. he is asking the state of variable l and p right before the function return.

His question is so vague even after understanding I can't re-generate the question.