C + + Classic face question

Char* MYSTRCPY (Char*strdest,Const Char*strsrc) {Assert (strdest! = NULL && STRSRC! =NULL); Char*temp =strdest;  while((*strdest++ = *strsrc++)! =' /') NULL; returntemp;}intMystrlen (Const Char*str) {Assert (str!=NULL); intLen =0;  while(*str++! =' /') {len++; }    returnLen;}voidBubblesort (vector<int> &data) {    intCount =data.size (); BOOLTag =false;  for(inti =0; I < count; i++) {tag=false;  for(intj =0; J < count-i-1; J + + )        {            if(Data[j] > data[j+1]) {tag=true; inttemp =Data[j]; DATA[J]= data[j+1]; Data[j+1] =temp; }        }        if( !tag) {             Break; }    }}voidQuickSort (vector<int> &data,intLeftintRight ) {    if(Left <Right ) {        intindex =Data[left]; intLow =Left ; intHigh =Right ;  while(Low <High ) {             while(Low < high && index < Data[high]) high--; Data[low]=Data[high];  while(Low < high && index > Data[low]) low++; Data[high]=Data[low]; } Data[low]=index; QuickSort (data, left, low-1); QuickSort (data, low+1, right); }}voidSelectsort (vector<int> &data) {    intCount =data.size ();  for(inti =0; I < count; i++ )    {        intMin =Data[i]; intindex =i;  for(intj = i+1; J < Count; J + + )        {            if(Min >Data[j]) {min=Data[j]; Index=J; }        }        if(I! =index) {            inttemp =Data[i]; Data[i]=Data[index]; Data[index]=temp; }    }}classstring{ Public: String (Const Char*str =NULL); String (ConstString &Other ); Virtual~string (void); String&operator=(ConstString &Other );Private:    Char*m_data;}; String::string (Const Char*str) {    if(str = =NULL) {m_data=New Char[1]; m_data[0] =' /'; } Else{m_data=New Char[Strlen (str) +1]; if(M_data! =NULL)        {strcpy (m_data, str); }}}string::string (ConstString &Other ) {m_data=New Char[Strlen (Other.m_data) +1]; if(M_data! =NULL)    {strcpy (m_data, other.m_data); }}string::~string (void){    if(M_data! =NULL) {        Delete[] m_data; }}string& String::operator=(ConstString &Other ) {    if( This= = &Other ) {        return* This; }     Delete[] m_data; M_data=New Char[Strlen (Other.m_data) +1]; if(M_data! =NULL)    {strcpy (m_data, other.m_data); }    return* This;}

C + + Classic face question