init

20220302_2.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+
+using namespace std;
+
+void splitDouble(double x, int &n, double &f) {
+    n = (int) x;
+    f = x - n;
+}
+
+int main() {
+    cout << "Enter one double number:\n";
+
+    double x = 0;
+    cin >> x;
+
+    int n = 0;
+    double f = 0;
+    splitDouble(x, n, f);
+
+    cout << "Integer part=" << n << "  Fraction Part=" << f;
+}

20220303.cpp

@@ -0,0 +1,141 @@
+#include <iostream>
+
+using namespace std;
+
+// 关于::的使用情况，我还是先去仔细看看Google的c++规范吧
+class Date {
+public:
+    Date();
+
+    Date(int year, int month, int day);
+
+    Date(const Date &date);
+
+    ~Date();
+
+    bool operator==(const Date &date) const;
+
+    bool operator!=(const Date &date) const;
+
+    void printDate();
+
+    void setToNextDay();
+
+    void setDate(int year, int month, int day);
+
+private:
+    int year = 1970;
+    int month = 1;
+    int day = 1;
+
+    int getMaxDayOfMonth() const;
+};
+
+Date::Date(int year, int month, int day) : year(year), month(month), day(day) {}
+
+Date::Date() : year(1900), month(1), day(1) {}
+
+Date::Date(const Date &date) {
+    Date::year = date.year;
+    Date::month = date.month;
+    Date::day = date.day;
+}
+
+Date::~Date() {
+    std::cout << "Don'..........t.........go.........away.......... (weakly)" << std::endl;
+}
+
+bool Date::operator==(const Date &date) const {
+    return year == date.year &&
+           month == date.month &&
+           day == date.day;
+}
+
+bool Date::operator!=(const Date &date) const {
+    return !(year == date.year &&
+             month == date.month &&
+             day == date.day);
+}
+
+void Date::printDate() {
+    std::cout << "--------------------------" << endl;
+    std::cout << "- year: " << year << std::endl
+              << "- month: " << month << std::endl
+              << "- day: " << day << std::endl;
+    std::cout << "--------------------------" << endl;
+}
+
+void Date::setToNextDay() {
+    Date::day++;
+
+    // 检查一下是不是到了下一个月
+    if (Date::day > getMaxDayOfMonth()) {
+        Date::day = 1;
+        Date::month++;
+
+        // 再检查一下是不是到了下一年
+        if (Date::month > 12) {
+            Date::month = 1;
+            Date::year++;
+        }
+    }
+}
+
+void Date::setDate(int year, int month, int day) {
+    Date::year = year;
+    Date::month = month;
+    Date::day = day;
+}
+
+int Date::getMaxDayOfMonth() const {
+    switch (Date::month) {
+        default:
+            return 0;
+        case 1:
+        case 3:
+        case 5:
+        case 7:
+        case 8:
+        case 10:
+        case 12:
+            return 31;
+        case 4:
+        case 6:
+        case 9:
+        case 11:
+            return 30;
+        case 2:
+            if (Date::year % 4 == 0) {
+                if (Date::year % 100 == 0) {
+                    return (Date::year % 400) == 0 ? 29 : 28;
+                } else {
+                    return 29;
+                }
+            }
+            return 28;
+    }
+}
+
+int main() {
+    Date defaultDate;
+    Date *constructorDate = new Date(2020, 3, 4);
+
+    std::cout << "[defaultDate]:" << std::endl;
+    defaultDate.printDate();
+
+    std::cout << "[constructorDate]:" << std::endl;
+    constructorDate->printDate();
+
+    std::cout << "[constructorDate - setDay()]:" << std::endl;
+    constructorDate->setDate(2021,12,31);
+    constructorDate->printDate();
+
+    std::cout << "[constructorDate - setToNextDay()]:" << std::endl;
+    constructorDate->setToNextDay();
+    constructorDate->printDate();
+
+    std::cout << "[Destructor]: ";
+    delete constructorDate;
+}
+
+

20220310.cpp

@@ -0,0 +1,103 @@
+#include "iostream"
+
+using namespace std;
+
+class Date {
+public:
+    Date();
+
+    Date(int year, int month, int day);
+
+    Date(const Date &date);
+
+    ~Date();
+
+    int getYear() const;
+
+    int getMonth() const;
+
+    int getDay() const;
+
+private:
+    int year = 1970;
+    int month = 1;
+    int day = 1;
+};
+
+Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
+    std::cout << "Date::Date(int year, int month, int day)" << std::endl;
+}
+
+Date::Date() : year(1970), month(1), day(1) {}
+
+Date::Date(const Date &date) {
+    cout << "Date::Date(const Date &p)" << endl;
+    Date::year = date.year;
+    Date::month = date.month;
+    Date::day = date.day;
+}
+
+Date::~Date() {
+    std::cout << "Date::~Date()" << std::endl;
+}
+
+int Date::getYear() const {
+    return year;
+}
+
+int Date::getMonth() const {
+    return month;
+}
+
+int Date::getDay() const {
+    return day;
+}
+
+//-------------------------------------------------
+class Person {
+public:
+    Person();
+
+    Person(char *name, const Date &birthday);
+
+    ~Person();
+
+    void showPerson();
+
+private:
+    string name;
+    Date birthday;
+};
+
+Person::Person() {
+    cout << "Person::Default constructor Function is called." << endl;
+}
+
+Person::Person(char *name, const Date &birthday) : name(name), birthday(birthday) {
+    cout << "Person::Constructor Function is called." << endl;
+}
+
+Person::~Person() {
+    std::cout << "Person::~Person()" << std::endl;
+}
+
+void Person::showPerson() {
+    cout << "Person::showPerson()" << endl;
+    cout << "Name:" << name << "  ";
+    cout << "Birthday:" << birthday.getYear() << '-' << birthday.getMonth() << '-' << birthday.getDay();
+    cout << endl;
+}
+
+int main() {
+    char name[20];
+    int y, m, d;
+    int Cas = 0;
+    cout << "Please input name & birthday:\n";
+    while (cin >> name >> y >> m >> d) {
+        Cas++;
+        cout << "CASE #" << Cas << ":" << endl;
+        Date d1(y, m, d);
+        Person person(name, d1);
+        person.showPerson();
+    }
+}

p97_3-15.cpp

@@ -0,0 +1,40 @@
+#include <iostream>
+
+using namespace std;
+
+int getPower(int x, int y) {
+    return (y == 0) ? 1 : x*getPower(x, y - 1);
+}
+
+double getPower(double x, int y) {
+    return (y == 0) ? 1 : x*getPower(x, y - 1);
+}
+
+// 不用三元运算符的写法
+/*
+int getPower(int x, int y) {
+    if (y == 0) {
+        return 1;
+    } else {
+        return x*getPower(x, y - 1);
+    }
+}
+
+double getPower(double x, int y) {
+    if (y == 0) {
+        return 1;
+    } else {
+        return x*getPower(x, y - 1);
+    }
+}
+ */
+ 
+int main() {
+    // double x = 0;
+    // int y = 0;
+    
+    int x = 0, y = 0;
+    cin >> x >> y;
+    
+    cout << getPower(x, y);
+}