{"id":215,"date":"2024-05-02T21:46:37","date_gmt":"2024-05-02T13:46:37","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=215"},"modified":"2024-05-02T21:46:39","modified_gmt":"2024-05-02T13:46:39","slug":"bjfuoj-c%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1-%e5%ae%9e%e9%aa%8c4-%e8%bf%90%e7%ae%97%e7%ac%a6%e9%87%8d%e8%bd%bd","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=215","title":{"rendered":"BJFUOJ-C++\u7a0b\u5e8f\u8bbe\u8ba1-\u5b9e\u9a8c4-\u8fd0\u7b97\u7b26\u91cd\u8f7d"},"content":{"rendered":"\n

\u5b8c\u6574\u9898\u76ee\u89c1BJFUOJ-C++\u7a0b\u5e8f\u8bbe\u8ba1-\u5b9e\u9a8c4-\u8fd0\u7b97\u7b26\u91cd\u8f7d-CSDN\u535a\u5ba2<\/a><\/h1>\n\n\n\n

A Singer\u7c7b<\/h1>\n\n\n\n

\u7b54\u6848\uff1a<\/h2>\n\n\n\n
#include<iostream>\n\nusing namespace std;\n\nclass Singer{    \nprivate:\n    string name;\n    char sex;\n    int age;\n    double score;\npublic:\n    string getName();   \n    friend istream & operator>>(istream & in,Singer & s);\n    friend ostream & operator<<(ostream & out,Singer & s);\n    friend bool operator>(Singer & s1,Singer & s2);\n    friend bool operator==(Singer & s1,Singer & s2);\n};\n\nstring Singer::getName()\n{\n    return this->name;\n}\n\nistream & operator>>(istream & in,Singer & s)\n{\n    in>>s.name>>s.sex>>s.age>>s.score;\n    return in;\n}\n\nostream & operator<<(ostream & out,Singer & s)\n{\n    out<<s.name<<\" \"<<s.sex<<\" \"<<s.age<<\" \"<<s.score;\n    return out;\n}\n\nbool operator>(Singer & s1,Singer & s2)\n{\n    if(s1.score>s2.score)\n        return true;\n    else\n        return false;\n}\n\nbool operator==(Singer & s1,Singer & s2)\n{\n    if(s1.score==s2.score)\n        return true;\n    else\n        return false;\n}\n\n\nint main()\n{\n    Singer s1,s2;\n    cin>>s1>>s2;\n    cout<<s1<<\"\\n\"<<s2<<endl;\n\n    if(s1>s2)\n        cout<<s1.getName()<<\"'s score is higher than \"<<s2.getName()<<\"'s.\\n\";\n    else if(s1==s2)\n        cout<<s1.getName()<<\"'s score is equal to \"<<s2.getName()<<\"'s.\\n\";\n    else\n        cout<<s1.getName()<<\"'s score is lower than \"<<s2.getName()<<\"'s.\\n\";\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u77e5\u8bc6\u70b9\uff1a<\/h2>\n\n\n\n
\u7b80\u5355\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3002<\/p>\n\n\n\n
B Sales_data\u7c7b<\/h1>\n\n\n\n
\u7b54\u6848\uff1a<\/h2>\n\n\n\n
#include<iostream>\n\nusing namespace std;\n\nclass Sales_data {\n\n\/\/\u4f9d\u6b21\u8f93\u5165\u4e66\u53f7\u3001\u9500\u91cf\u548c\u6536\u5165\n    friend istream & operator>>(istream&, Sales_data &);\n\/\/\u4f9d\u6b21\u8f93\u51fa\u4e66\u53f7\u3001\u9500\u91cf\u3001\u6536\u5165\u548c\u5747\u4ef7\n    friend ostream & operator<<(ostream &, const Sales_data &);\n    friend bool operator==(const Sales_data &, const Sales_data &);\n    friend bool operator!=(const Sales_data &, const Sales_data &);\n\/\/ for \"+\", assume that both objects refer to the same book\n    friend Sales_data operator+(const Sales_data &, const Sales_data &);\n\npublic:\n    Sales_data(): units_sold(0), revenue(0.0) {}\n    Sales_data(const string & s, unsigned n, double r): bookNo(s), units_sold(n), revenue(r) {}\n    string get_bookNo() const;\n    \/\/ for \"+=\", assume that both objects refer to the same book\n    Sales_data & operator+=(const Sales_data &);\n\nprivate:\n    double avg_price() const;  \/\/\u5747\u4ef7\uff0c\u7b49\u4e8e\u6536\u5165\u9664\u4ee5\u9500\u91cf\n    string bookNo;        \/\/\u4e66\u53f7\n    unsigned units_sold; \/\/\u9500\u91cf\n    double revenue;      \/\/\u6536\u5165\n};\n\ndouble Sales_data::avg_price() const\n{\n    return revenue\/units_sold;\n}\n\nistream & operator>>(istream& is,Sales_data & s)\n{\n    is>>s.bookNo>>s.units_sold>>s.revenue;  \n\n    return is;\n} \nostream & operator<<(ostream & os, const Sales_data & s)\n{\n    os<<s.bookNo<<\" \"<<s.units_sold<<\" \"<<s.revenue<<\" \"<<s.avg_price();\n    return os;\n}\n\nbool operator==(const Sales_data & s1, const Sales_data & s2)\n{\n    if(s1.bookNo==s2.bookNo)\n        return 1;\n    else\n        return 0;\n}\n\nbool operator!=(const Sales_data &s1, const Sales_data &s2)\n{\n    if(s1.bookNo==s2.bookNo)\n        return 0;\n    else\n        return 1;\n}\n\nSales_data operator+(const Sales_data &s1, const Sales_data &s2)\n{\n    Sales_data ts;\n    ts.bookNo=s1.bookNo;\n    ts.units_sold=s1.units_sold+s2.units_sold;\n    ts.revenue=s1.revenue+s2.revenue;\n    return ts;\n}\n\nstring Sales_data::get_bookNo() const\n{\n    return this->bookNo;\n}\n\nSales_data & Sales_data::operator+=(const Sales_data & s)\n{\n    this->revenue+=s.revenue;\n    this->units_sold+=s.units_sold;\n    return *this;\n}\n\nint main(){\n    Sales_data item1,item2;\n\n    while(cin>>item1>>item2){\n        cout<<item1<<\"\\n\"<<item2<<\"\\n\";\n        if(item1==item2)\n            cout<<item1.get_bookNo()<<\" equals \"<<item2.get_bookNo()<<\"\\n\";\n        if(item1!=item2)\n            cout<<item1.get_bookNo()<<\" doesn't equal \"<<item2.get_bookNo()<<\"\\n\";\n        cout<<(item1+item2)<<\"\\n\";\n        item1 += item2;\n        cout<<item1<<\"\\n\";\n    }\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u77e5\u8bc6\u70b9\uff1a<\/h2>\n\n\n\n
\u9ebb\u70e6\u4e00\u70b9\u7684\u7b80\u5355\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3002<\/p>\n\n\n\n
C Complex\u7c7b<\/h1>\n\n\n\n
\u7b54\u6848\uff1a<\/h2>\n\n\n\n
#include<iostream>\nusing namespace std;\n\nclass Complex\n{\nprivate:\n    double x;\n    double y;\n\npublic:\n    Complex(double x = 0.0, double y = 0.0);\n    Complex & operator+=(const Complex &);\n    Complex & operator-=(const Complex &);\n    Complex & operator*=(const Complex &);\n    Complex & operator\/=(const Complex &);\n\n    friend Complex operator+(const Complex &, const Complex &);\n    friend Complex operator-(const Complex &, const Complex &);\n    friend Complex operator*(const Complex &, const Complex &);\n    friend Complex operator\/(const Complex &, const Complex &);\n    friend bool operator==(const Complex &, const Complex &);\n    friend bool operator!=(const Complex &, const Complex &);\n    friend ostream & operator<<(ostream &, const Complex &);\n    friend istream & operator>>(istream &, Complex &);\n};\n\nComplex::Complex(double x, double y)\n{\n    this->x=x;\n    this->y=y;\n}\n\nComplex & Complex::operator+=(const Complex & c)\n{\n    this->x+=c.x;\n    this->y+=c.y;\n    return *this;\n}\n\nComplex & Complex::operator-=(const Complex & c)\n{\n    this->x-=c.x;\n    this->y-=c.y;\n    return *this;\n}\n\n\/\/\u9700\u8981\u5c06\u4e34\u65f6\u53d8\u91cf\u4fdd\u5b58\u539f\u59cb\u6570\u503c\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8ba1\u7b97\u64cd\u4f5c\nComplex & Complex::operator*=(const Complex & c)\n{\n    double tx=x;\n    double ty=y;\n    x=tx*c.x-ty*c.y;\n    y=tx*c.y+ty*c.x;\n    return *this;\n}\n\nComplex & Complex::operator\/=(const Complex & c)\n{\n    double tx=x;\n    double ty=y;\n    this->x=(tx*c.x+ty*c.y)\/(c.x*c.x+c.y*c.y);\n    this->y=(ty*c.x-tx*c.y)\/(c.x*c.x+c.y*c.y);\n    return *this;\n}\n\nComplex operator+(const Complex &c1, const Complex &c2)\n{\n    Complex tc;\n    tc.x=c1.x+c2.x;\n    tc.y=c1.y+c2.y;\n    return tc;\n}\n\nComplex operator-(const Complex &c1, const Complex &c2)\n{\n    Complex tc;\n    tc.x=c1.x-c2.x;\n    tc.y=c1.y-c2.y;\n    return tc;\n}\n\nComplex operator*(const Complex &c1, const Complex &c2)\n{\n    Complex tc;\n    tc.x=c1.x*c2.x-c1.y*c2.y;\n    tc.y=c1.x*c2.y+c1.y*c2.x;\n    return tc;\n}\n\nComplex operator\/(const Complex &c1, const Complex &c2)\n{\n    Complex tc; \n    tc.x=(c1.x*c2.x+c1.y*c2.y)\/(c2.x*c2.x+c2.y*c2.y);\n    tc.y=(c1.y*c2.x-c1.x*c2.y)\/(c2.x*c2.x+c2.y*c2.y);\n    return tc;\n}\n\nbool operator==(const Complex &c1, const Complex &c2)\n{\n    if(c1.x==c2.x)\n        return 1;\n    else\n        return 0; \n}\n\nbool operator!=(const Complex &c1, const Complex &c2)\n{\n    if(c1.x==c2.x)\n        return 0;\n    else\n        return 1;   \n}\n\nostream & operator<<(ostream &os, const Complex &c)\n{\n    os<<c.x<<\" + \"<<c.y<<\"i\";\n    return os;\n}\n\nistream & operator>>(istream &is, Complex &c)\n{\n    is>>c.x>>c.y;\n    return is;\n}\n\nint main()\n{\nComplex c1, c2;\n\n    cin >> c1 >> c2;\n    cout << \"c1 = \" << c1 << \"\\n\" << \"c2 = \" << c2 << endl;\n    cout << \"c1+c2 = \" << c1 + c2 << endl;\n    cout << \"c1-c2 = \" << c1 - c2 << endl;\n    cout << \"c1*c2 = \" << c1 * c2 << endl;\n    cout << \"c1\/c2 = \" << c1 \/ c2 << endl;\n    cout << (c1 += c2) << endl;\n    cout << (c1 -= c2) << endl;\n    cout << (c1 *= c2) << endl;\n    cout << (c1 \/= c2) << endl;\n    cout << (c1 == c2) << \" \" << (c1 != c2) << endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u77e5\u8bc6\u70b9\uff1a<\/h2>\n\n\n\n
\u5f88\u7ecf\u5178\u5168\u9762\u7684\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5b9e\u4f8b\uff0c\u6ce8\u610f\u4e00\u4e0b\u5b9e\u73b0\u4e58\u9664\u6cd5\u65f6\u9700\u8981\u5c06\u4e34\u65f6\u53d8\u91cf\u4fdd\u5b58\u539f\u59cb\u6570\u503c\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8ba1\u7b97\u64cd\u4f5c\u3002<\/p>\n\n\n\n
D String\u7c7b (\u91cd\u70b9\u5b66\u4e60)<\/h1>\n\n\n\n
\u63cf\u8ff0\uff1a<\/h3>\n\n\n\n
\u5b9e\u73b0\u4ee5\u4e0bString\u7c7b\uff1a<\/p>\n\n\n\n
class String
{
private:
char * s;
public:
String();
String(const char *);
String(const String &);
~String();
String & operator=(const char *);
String & operator=(const String &);
String operator+(const char *);
String operator+(const String &);
String & operator+=(const char *);
String & operator+=(const String &);
friend istream & operator>>(istream &, String &);
friend ostream & operator<<(ostream &, const String &);
friend bool operator==(const String &, const char *);
friend bool operator==(const String &, const String &);
friend bool operator!=(const String &, const char *);
friend bool operator!=(const String &, const String &);
};<\/p>\n\n\n\n
\u4f7f\u7528\u4ee5\u4e0bmain\u51fd\u6570\u8fdb\u884c\u6d4b\u8bd5\uff1a<\/p>\n\n\n\n
int main()
{
String s;
s += “hello”;
cout<> s3;
cout << s3 << endl;
String s4(“String4”), s5(s4);
cout << (s5 == s4) << endl;
cout << (s5 != s4) << endl;
String s6(“End of “), s7(“my string.”);
s6 += s7;
cout << s6 << endl;
return 0;
}<\/p>\n\n\n\n
\u8f93\u5165\uff1a<\/h3>\n\n\n\n
s3\u7684\u503c<\/p>\n\n\n\n
\u8f93\u51fa\uff1a<\/h3>\n\n\n\n
\u89c1\u793a\u4f8b\u4e0e\u4e3b\u51fd\u6570<\/p>\n\n\n\n
\u8f93\u5165\u6837\u4f8b\uff1a<\/h3>\n\n\n\n
   String3<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u6837\u4f8b\uff1a<\/h3>\n\n\n\n
hello\nString1\ncopy of String1\nString3\n1\n0\nEnd of my string.<\/code><\/pre>\n\n\n\n
\u7b54\u6848\uff1a<\/h2>\n\n\n\n
#include<iostream>\n#include<cstring>\nusing namespace std;\n\nclass String\n{\nprivate:\n    char* s;\n\npublic:\n    String();\n    String(const char*);\n    String(const String&);\n    ~String();\n\n    String& operator=(const char*);\n    String& operator=(const String&);\n    String operator+(const char*);\n    String operator+(const String&);\n    String& operator+=(const char*);\n    String& operator+=(const String&);\n\n    friend istream& operator>>(istream&, String&);\n    friend ostream& operator<<(ostream&, const String&);\n    friend bool operator==(const String&, const char*);\n    friend bool operator==(const String&, const String&);\n    friend bool operator!=(const String&, const char*);\n    friend bool operator!=(const String&, const String&);\n};\n\nString::String()\n{\n    s = new char[1];\n    s[0]='\\0';\n    \/\/s=NULL;\n}\n\nString::String(const char* tc)\n{\n    s = new char[strlen(tc) + 1];\n    strcpy(s, tc);\n}\n\nString::String(const String& ts)\n{\n    s = new char[strlen(ts.s) + 1];\n    strcpy(s, ts.s);\n}\n\nString::~String()\n{\n    delete[] s;\n}\n\nString& String::operator=(const char* tc)\n{\n    s = new char[strlen(tc) + 1];\n    strcpy(s, tc);\n    return *this;\n}\n\nString& String::operator=(const String& ts)\n{\n    s = new char[strlen(ts.s) + 1];\n    strcpy(s, ts.s);\n    return *this;\n}\n\nString String::operator+(const char* tc)\n{\n    String news;\n    news.s = new char[strlen(s) + strlen(tc) + 1];\n    strcpy(news.s, s);\n    strcat(news.s, tc);\n    return news;\n}\n\nString String::operator+(const String& ts)\n{\n    String news;\n    news.s = new char[strlen(s) + strlen(ts.s) + 1];\n    strcpy(news.s, s);\n    strcat(news.s, ts.s);\n    return news;\n}\n\nString& String::operator+=(const char* tc)\n{\n    char* news = new char[strlen(s) + strlen(tc) + 1];\n    strcpy(news, s);\n    strcat(news, tc);\n    delete[] s;\n    s = news;\n    return *this;\n}\n\nString& String::operator+=(const String& ts)\n{\n    char* news = new char[strlen(s) + strlen(ts.s) + 1];\n    strcpy(news, s);\n    strcat(news, ts.s);\n    delete[] s;\n    s = news;\n    return *this;\n}\n\nistream& operator>>(istream& is, String& ts)\n{\n\n    char temp[100];\n    is >> temp;\n    delete[] ts.s;\n    ts.s = new char[strlen(temp) + 1];\n    strcpy(ts.s, temp);\n    return is;\n}\n\nostream& operator<<(ostream& os, const String& ts)\n{\n    os << ts.s;\n    return os;\n}\n\nbool operator==(const String& ts, const char* tc)\n{\n    return (strcmp(ts.s, tc) == 0);\n}\n\nbool operator==(const String& ts1, const String& ts2)\n{\n    return (strcmp(ts1.s, ts2.s) == 0);\n}\nbool operator!=(const String& ts, const char* tc)\n{\n    return !(strcmp(ts.s, tc) == 0);\n}\n\nbool operator!=(const String& ts1, const String& ts2)\n{\n    return !(strcmp(ts1.s, ts2.s) == 0);\n}\n\n\nint main()\n{\n    String s;\n    s += \"hello\";\n    cout << s << endl;\n    String s1(\"String1\");\n    String s2(\"copy of \");\n    s2 += \"String1\";\n    cout << s1 << \"\\n\" << s2 << endl;\n    String s3;\n    cin >> s3;\n    cout << s3 << endl;\n    String s4(\"String4\"), s5(s4);\n    cout << (s5 == s4) << endl;\n    cout << (s5 != s4) << endl;\n    String s6(\"End of \"), s7(\"my string.\");\n    s6 += s7;\n    cout << s6 << endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u77e5\u8bc6\u70b9\uff1a<\/h2>\n\n\n\n
1.\u9996\u5148\u6ce8\u610f\u5230\u6210\u5458\u662f\u4e2a\u5b57\u7b26\u6307\u9488\uff0c\u8981\u60f3\u5230new\u4e0edelete\u3001\u6d45\u62f7\u8d1d\u4e0e\u6df1\u62f7\u8d1d\u76f8\u5173\u77e5\u8bc6\u3002
2.\u65e0\u53c2\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n
String::String()\n{\n    s = new char[1];\n    s[0]='\\0';\n    \/\/s=NULL;\n}<\/code><\/pre>\n\n\n\n
\u8981\u4e3a\u7c7b\u7684\u6210\u5458\u53d8\u91cfs\u52a8\u6001\u5206\u914d\u5185\u5b58\u6765\u5b58\u50a8\u5b57\u7b26\u4e32\u3002\u7531\u4e8e\u5b57\u7b26\u4e32\u662f\u4ee5\\0\u7ed3\u5c3e\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\n\u6240\u4ee5\u9700\u8981\u4e3as\u5206\u914d\u4e00\u4e2a\u957f\u5ea6\u4e3a1\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u5e76\u5c06\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u8bbe\u4e3a\u5b57\u7b26\u2019\\0\u2019\uff0c\u4ee5\u8868\u793a\u7a7a\u5b57\u7b26\u4e32\u7684\u7ed3\u675f\u3002\n\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdds\u6210\u5458\u53d8\u91cf\u59cb\u7ec8\u4ee5\u7a7a\u5b57\u7b26\u4e32\u7ed3\u5c3e\uff0c\u4ece\u800c\u6b63\u786e\u8868\u793a\u4e00\u4e2a\u7a7a\u7684String\u5bf9\u8c61\u3002\n\n\u800cs=NULL\u4e0d\u884c\uff1a\u56e0\u4e3aString\u7c7b\u8868\u793a\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\n\u5982\u679c\u5c06s\u8d4b\u503c\u4e3aNULL\uff0c\u90a3\u4e48s\u5c06\u6307\u5411\u7a7a\u5730\u5740\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u3002\u8fd9\u6837\u4f1a\u5bfc\u81f4\u540e\u7eed\u5bf9s\u64cd\u4f5c\u65f6\u51fa\u73b0\u9519\u8bef\u3002<\/code><\/pre>\n\n\n\n
3.\u4e24\u4e2a\u62f7\u8d1d\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n
String::String(const char* tc)\n{\n    s = new char[strlen(tc) + 1];\n    strcpy(s, tc);\n}\n\nString::String(const String& ts)\n{\n    s = new char[strlen(ts.s) + 1];\n    strcpy(s, ts.s);\n}<\/code><\/pre>\n\n\n\n
\u9996\u5148\u4e3as\u7533\u8bf7\u8db3\u591f\u7684\u7a7a\u95f4\uff0c\u518d\u901a\u8fc7strcpy\uff08\uff09\u5b9e\u73b0\u5b57\u7b26\u4e32\u7684\u6df1\u62f7\u8d1d\u3002<\/p>\n\n\n\n
4.\u6ce8\u610f\u6790\u6784\u51fd\u6570\u4e2d\u4f7f\u7528delete\u3002
5.\u5bf9=\u91cd\u8f7d\u65f6\u8981\u5220\u9664\u539f\u6765\u7684\u503c\uff1b
6.\u5bf9+\u91cd\u8f7d\u65f6\u903b\u8f91\u4e3a\u521b\u9020\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0cstrcpy\u524d\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u518dstrcat\u52a0\u4e0a\u540e\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u6700\u540e\u8fd4\u56de\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u3002
7.+=\u4e0e\uff0b\u533a\u522b\uff1a
\u521b\u5efa\u7684\u662fchar* \u800c\u975estring\u7c7b\u5bf9\u8c61\uff08\u6700\u540e\u76f4\u63a5\u8d4b\u4e88String.s\uff09\uff1b
s = news;\u524ddelete\u539f\u5148\u5bf9\u8c61\u3002
\u6700\u540e\u8fd4\u56de\u7684\u662f\u81ea\u5df1\u3002
8.>>\u7684\u91cd\u8f7d\uff1a
\u76f4\u63a5is>>ts.s\u4e5f\u80fd\u901a\u8fc7\u4f46\u5e76\u4e0d\u7b26\u5408\u5e38\u7406\uff0c\u5e94\u8be5\u6309\u4e0a\u6587\u5199\u6cd5\uff1b
9.strcmp\u7684\u8fd4\u56de\u503c\uff1b\uff08\u4e3a0\u4e3a\u76f8\u7b49\uff09<\/p>\n\n\n\n
E CheckedPtr<\/h1>\n\n\n\n
\u7b54\u6848\uff1a<\/h2>\n\n\n\n
#include<iostream>\nusing namespace std;\n\nclass CheckedPtr\n{\npublic:\n    CheckedPtr(int * b, int * e) : beg(b), end(e), curr(b) {  }\n    CheckedPtr & operator ++(); \/\/ prefix ++\n    CheckedPtr & operator --(); \/\/ prefix --\n    CheckedPtr   operator ++(int); \/\/ postfix ++\n    CheckedPtr   operator --(int); \/\/ postfix --\n    int * GetBeg();\n    int * GetEnd();\n    int * GetCurr();\n\nprivate:\n    int * beg;  \/\/ pointer to beginning of the array\n    int * end;  \/\/ one past the end of the array\n    int * curr; \/\/ current position within the array\n};\n\nCheckedPtr & CheckedPtr::operator ++()\n{\n    ++curr;\n    return *this;\n}\n\nCheckedPtr & CheckedPtr::operator --()\n{\n    --curr;\n    return *this;\n}\n\nCheckedPtr   CheckedPtr::operator ++(int)\n{\n    CheckedPtr temp = *this;\n    ++curr;\n    return temp;\n}\n\nCheckedPtr   CheckedPtr::operator --(int)\n{\n    CheckedPtr temp = *this;\n    --curr;\n    return temp;\n}\n\nint * CheckedPtr::GetBeg()\n{\n    return beg;\n}\n\nint * CheckedPtr::GetEnd()\n{\n    return end;\n}\n\nint * CheckedPtr::GetCurr()\n{\n    return curr;\n}\n\nint main(){\n    int n;\n    cin>>n;\n    int * array = new int[n];\n\n    for(int i=0;i<n;i++)\n        cin>>array[i];\n    CheckedPtr cp(array, array+n);\n    for(;cp.GetCurr()<cp.GetEnd();cp++)\n        cout<<*cp.GetCurr()<<\" \";\n    cout<<endl;\n    for(--cp;cp.GetCurr()>cp.GetBeg();cp--)\n        cout<<*cp.GetCurr()<<\" \";\n    cout<<*cp.GetCurr()<<endl;\n    delete [] array;\n\nreturn 0;\n\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u77e5\u8bc6\u70b9\uff1a<\/h2>\n\n\n\n
\u8fd9\u91cc\u4e3b\u8981\u5173\u6ce8\u524d\u7f00++\/–\u4e0e\u540e\u7f00++\/–\u7684\u5199\u6cd5\u53ca\u5176\u533a\u522b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b8c\u6574\u9898\u76ee\u89c1BJFUOJ-C++\u7a0b\u5e8f\u8bbe\u8ba1-\u5b9e\u9a8c4-\u8fd0\u7b97\u7b26\u91cd\u8f7d-CSDN\u535a\u5ba2 A Singer\u7c7b \u7b54\u6848\uff1a \u91cd\u8981\u77e5\u8bc6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29,5],"tags":[23,35,36],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-c","category-5","tag-c","tag-35","tag-36"],"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=215"}],"version-history":[{"count":1,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":216,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/215\/revisions\/216"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}