while ((str[j++] = str[i++]) != 0);

这是一个删除所有开始一样的字符的函数

char* RemoveCharAtBegin(char* str, char ch)
{
	int i = 0;
	while (str[i] == ch && str[i] != 0)
	{
		i++;
	}
	int j = 0;
	while ((str[j++] = str[i++]) != 0);
	return str;
}