将此文件改为多文件#include<iostream> #include<string.h> using namespace std; class CSTRING { private: char* p; public: CSTRING() { int len = 0; p = new char[len + 1]; p[0] = '\0'; } CSTRING(const char* str) { int len = strlen(str); p = new char[len + 1]; strcpy(p, str); } CSTRING(const CSTRING& str) { int len = strlen(str.p); p = new char[len + 1]; strcpy(p, str.p); } CSTRING operator+=( CSTRING& s) { char* str = new char[strlen(p) + strlen(s.p) + 3]; str[0] = '\0'; strcat(str, p); strcat(str, "--"); strcat(str, s.p); delete[]p; p = str; return *this; } friend ostream& operator<<(ostream& out, CSTRING& str); friend istream& operator>>(istream& in, CSTRING& str); int operator>(const CSTRING& str); }; ostream& operator<<(ostream& out, CSTRING& str) { out << str.p; return out; } istream& operator>>(istream& in, CSTRING& str) { in >> str.p; return in; } int CSTRING:: operator>(const CSTRING& str) { if (strcmp(p, str.p)>0){ return 1; }else {return 0; } } int main() { int n, i, j; while (cin >> n) { CSTRING *c = new CSTRING[n + 2]; for (i = 0; i < n; i++) { cin >> c[i]; } for (i = 0; i < n - 1; i++) for (j = 0; j < n - i - 1; j++) if (c[j] > c[j + 1]) { c[n] = c[j]; c[j] = c[j + 1]; c[j + 1] = c[n]; } for (i = 0; i < n; i++) c[n + 1] += c[i]; cout << c[n + 1] << endl; delete[] c; } return 0; }

这里提供一个多文件的实现，将CSTRING类的定义和实现分别放在CSTRING.h和CSTRING.cpp文件中，主函数放在main.cpp文件中。

CSTRING.h文件内容如下：

#ifndef CSTRING_H
#define CSTRING_H

#include<iostream>
#include<string.h>

using namespace std;

class CSTRING {
private:
    char* p;

public:
    CSTRING();
    CSTRING(const char* str);
    CSTRING(const CSTRING& str);
    ~CSTRING();

    CSTRING operator+=(CSTRING& s);
    int operator>(const CSTRING& str);

    friend ostream& operator<<(ostream& out, CSTRING& str);
    friend istream& operator>>(istream& in, CSTRING& str);
};

#endif

CSTRING.cpp文件内容如下：

#include "CSTRING.h"

CSTRING::CSTRING() {
    int len = 0;
    p = new char[len + 1];
    p[0] = '\0';
}

CSTRING::CSTRING(const char* str) {
    int len = strlen(str);
    p = new char[len + 1];
    strcpy(p, str);
}

CSTRING::CSTRING(const CSTRING& str) {
    int len = strlen(str.p);
    p = new char[len + 1];
    strcpy(p, str.p);
}

CSTRING::~CSTRING() {
    delete[] p;
}

CSTRING CSTRING::operator+=(CSTRING& s) {
    char* str = new char[strlen(p) + strlen(s.p) + 3];
    str[0] = '\0';
    strcat(str, p);
    strcat(str, "--");
    strcat(str, s.p);
    delete[]p;
    p = str;
    return *this;
}

int CSTRING::operator>(const CSTRING& str) {
    if (strcmp(p, str.p) > 0) {
        return 1;
    }
    else {
        return 0;
    }
}

ostream& operator<<(ostream& out, CSTRING& str) {
    out << str.p;
    return out;
}

istream& operator>>(istream& in, CSTRING& str) {
    in >> str.p;
    return in;
}

main.cpp文件内容如下：

#include<iostream>
#include"CSTRING.h"

using namespace std;

int main() {
    int n, i, j;
    while (cin >> n)
    {
        CSTRING* c = new CSTRING[n + 2];
        for (i = 0; i < n; i++)
        {
            cin >> c[i];
        }
        for (i = 0; i < n - 1; i++)
            for (j = 0; j < n - i - 1; j++)
                if (c[j] > c[j + 1])
                {
                    c[n] = c[j];
                    c[j] = c[j + 1];
                    c[j + 1] = c[n];
                }
        for (i = 0; i < n; i++)
            c[n + 1] += c[i];
        cout << c[n + 1] << endl;
        delete[] c;
    }
    return 0;
}