C++01位转为为递增01位

#include <iostream>
#include <string.h>
using namespace std;
char * Grial(char *str,int x)
{
	int j = x-1;
	int i = 0;
	char *p = str+j;
	char *q = str;
	char temp;
	while(i<j)
	{
		while(*p!='0')
		{
		p--;
		j--;
		}
		while(*q!='1')
		{
		q++;
		i++;
		}
		if(i<j)
		{
		temp = *p;
		*p = *q;
		*q = temp;
		}
	}
	return str;
}
int main()
{
	char s[]="0101";
	cout<<Grial(s,strlen(s))<<endl;//0011
	return 0;
}