整数装换为字符串intToArray与字符串转为整数 arrayToInt实现

 1 char *intToArray(int number, char *str)
 2 {
 3     if(str == NULL)
 4     {
 5         return NULL;
 6     }
 7     char *ret = str;
 8     char *left = str;
 9     char temp = '