#include <iostream.h>
#define SIZE 255
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <istream.h>
#include <fstream.h>
class X{
char *str;
char *str_return;
public:
X();
X(char*);
~X();
char* Run();
void Set(char*);
friend void print(X&);
friend ostream& operator<<(ostream&,X&);
friend istream& operator>>(istream&,X&);
friend char* Run(X&);
};


X::X(){
str=new char[SIZE];
str[0]='\0';
str_return=new char[SIZE];
str_return[0]='\0';
};

X::X(char *s){
str=new char[SIZE];
strcpy(str,s);
str_return=new char[SIZE];
str_return[0]='\0';
};


X::~X(){
delete[] str;
}


void X::Set(char* s){
for (unsigned int i=0;i<strlen(s);i++){
str[i]=s[i];
str[i]='\0';}

};

char* X::Run(){
int j = strlen(str)/2;
char d, p;
if (strlen(str)%4 == 0) {
for (unsigned int i=0;i<strlen(str);i++)
{
if (i < j) {
d = str[i];
p = str[i+j];

str[i] = p;
str[i+j] = d;
}
} print(str);

}else{
cout<<"stroka ne kratna 4"<<endl;
}

return str_return;
};


char* Run(X &obj){return obj.Run();};
void print(X &obj){cout<<obj.str<<" "<<obj.str_return<<endl;};
ostream& operator<<(ostream &stream,X &ob) {
stream << ob.str ;
return stream;
};

istream &operator>>(istream &stream,X &ob){
stream >> ob.str;
return stream;
};


void main (void){
char s[265];
ofstream out("C:\\Cpp\\mf.txt");
cout<<"Vvedite stroku:   ";
cin.getline(s,256);
X str(s);
cout<<"Vi vveli:   ";
print(str);
out<<str<<"\n";
cout<<"Stroka posle preobrazovaniya:   ";
Run(str);
out<<str<<"\n";
cout<<endl;
out.close();
cout<<"Vvedite stroku:   ";
cin.getline(s,256);
X *pstr;
pstr=new X();
pstr->Set(s);
cout<<"Vi vveli:   ";
print(s);
cout<<"Stroka posle preobrazovaniya:   ";
cout<<Run(s)<<endl;
delete pstr;
system("pause");
};