CareerCup

char *revcopy(char *s)
{
int i, len = strlen(s);
char *ret;

ret = malloc(len+1);
for (i = 0; i < len; i++)
ret[i] = s[len-i-1];

ret[i] = 0;
return ret;
}

How do u think it creates dangling reference? Since memory was allocated using malloc(), it is fine to record pointer in different variable and delete the previous pointer.

void ReverseWords (char str[])
{
	int start = 0, end = 0, length;
	length = strlen(str);
	while (end < length) {
		if (str[end] != ' ') { /* Skip non-word characters */
			start = end;
			while (end < length && str[end] != ' ') end++;
			end--;
			ReverseString(str, start, end);
		}
		end++; /* Advance to next token */
	}
return;
}

void ReverseString (char str[], int start, int end) 
{ 
        char temp; while (end > start) {
	/* Exchange characters */
	temp = str [start];
	str [start] = str [end] ;
	str [end] = temp;
	/* Move indices towards middle */ start++; end--;
} 
	return; 
}

Use recursion ......

void revstr(char*p)
{

static int k=0;
char ch;


if(*p=='\n')
return;

else
{
ch=p[0];
return revstr(p+1);
}

p[k++]=ch;

}

using namespace std;

int main()
{
	const char * word="Hello How are you doing";
	int size=strlen(word);

	char * newWord =static_cast<char *>(malloc(size+1));
	int j=0;
	
	for (int i = size-1; i >=0; --i)
	{
		newWord[j]=word[i];
		j++;
	}
	

	int newWordsize=strlen(newWord);	
	cout << word << "\n" << newWord << endl;
	return 0;
}