Reverse a string

Question

Reverse a string

dynamitemike@hotmail.com · Accepted Answer

/*
 *   Reverse a string
 */
void	revstr(char *s)	{

int	i;
char	*temp,	*r,	*t;


	if (strlen(s) == 1)
		return;

	r = s;
	t = s + strlen(s) -1;
	while (t > r)	{
		*temp = *r;
		*r = *t;
		*t = *temp;
		t--;
		r++;
	}
}

WilliamCampbell · Answer

local variable i is not used at all
strlen called twice 
pointers can be incremented while accessing

char * revstr (char * string )
{
        if ( NULL == string ) return NULL;

        char *start = string; // Save point to beginning
        char *left = string;
        char ch;

        while (*string++)                // Find end of string
                ;
        string -= 2;                          // Hop back over zero terminator

        while (left < string)
        {
                ch = *left;
                *left++ = *string;
                *string-- = ch;
        }

        return(start);
}

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