提交第7章和第八章编程题

C++/codes/2024-07/杨晓宇/c10-1.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+#include <string>
+
+class Bank
+{
+public:
+    Bank(std::string name, std::string id)
+    {
+        _name = name;
+        _id = id;
+    }
+    Bank(std::string name, std::string id, long long count)
+    {
+        _name = name;
+        _id = id;
+        _count = count;
+    }
+    void show()
+    {
+        std::cout << _name << std::endl << _id 
+        << std::endl << _count << std::endl;
+    }
+    void add(long long val)
+    {
+        _count += val;
+    }
+    void del(long long val)
+    {
+        _count -= val;
+    }
+
+private:
+    std::string _name;
+    std::string _id;
+    long long   _count = 0;
+};
+
+int main()
+{
+    Bank bank("test", "000001");
+    bank.show();
+    bank.add(10000);
+    bank.show();
+    bank.del(1000);
+    bank.show();
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c10-2.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+
+class plorg
+{
+public:
+    plorg(){}
+    plorg(char *name_in, int CI_in)
+    {
+        int a = 0;
+        while(name_in[a] != '\0')
+        {    
+            name[a] = name_in[a];
+            ++a;
+        }
+        name[a] = name_in[a];
+        CI = CI_in;
+    }
+    ~plorg(){}
+
+    void setCI(int CI_in){CI=CI_in;}
+    void show()
+    {
+        std::cout << name << "    " << CI << std::endl;
+    }
+private:
+    char name[20] = "Plorga";
+    int  CI       = 0;
+};
+
+int main()
+{
+    plorg plorg1("TEST", 1), plorg2;
+    plorg1.show();
+    plorg2.setCI(2);
+    plorg2.show();
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c7-1.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+/**
+ * @brief 返回调和平均数
+ * 
+ * @param x 输入1
+ * @param y 输入2
+ * @return double 
+ */
+double func(double x, double y)
+{
+    return 2.0 * x * y / (x + y);
+}
+
+int main()
+{
+    double x, y;
+    while(1)
+    {
+        cin >> x >> y;
+        if(x == 0.0 || y == 0.0)
+            break;
+        cout << func(x, y) << endl;
+    }
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c7-2.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+/**
+ * @brief 返回两数之和
+ * 
+ * @param x 被加数
+ * @param y 加数
+ * @return double 
+ */
+double add(double x, double y)
+{
+    return x + y;
+}
+
+/**
+ * @brief 返回两数之差
+ * 
+ * @param x 被减数
+ * @param y 减数
+ * @return double 
+ */
+double del(double x, double y)
+{
+    return x - y;
+}
+
+/**
+ * @brief 调用add和del函数
+ * 
+ * @param x 输入1
+ * @param y 输入2
+ * @return double 
+ */
+double (*calculate[2])(double x, double y) = {add, del};
+
+int main()
+{
+    double x, y;
+    while(1)
+    {
+        cin >> x >> y;
+        if(x == 0.0 || y == 0.0)
+            break;
+        cout << x << " add " << y << " = " 
+            << (*calculate[0])(x, y) << endl;
+        cout << x << " del " << y << " = " 
+            << (*calculate[1])(x, y) << endl;
+    }
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c8-1.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+int cnt = 0;
+
+/**
+ * @brief 输出输入字符串
+ * 
+ * @param str 输入的字符串
+ * @param n 参数
+ */
+void func(char *str, int n = 0)
+{
+    ++cnt;
+    cout << str << endl;
+    if(n != 0)
+        for(int a = 1; a < cnt; a++)
+            cout << str << endl;
+    return;
+}
+
+int main()
+{
+    int n;
+    char str[255];
+    while(1)
+    {
+        cin >> str >> n;
+        func(str, n);
+    }
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c8-2.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+template <typename T>
+T maxn(T *num, int n = 0)
+{
+    if(n != 0)
+    {
+        T pmax = *num;
+        num++;
+        for(int a = 0; a < n-1; ++a, num++)
+            pmax = pmax > *num ? pmax : *num;
+        return pmax;
+    }
+    return *num;
+}
+template <> char * maxn<char *> (char **num, int n)
+{
+    if(n != 0)
+    {
+        auto getLen = [](char *str){
+            int a = 0;
+            while(str[a] != '\0')
+                a++;
+            return a+1;
+        };
+        int tempLen1 = getLen(num[0]), tempLen2 = 0;
+        char *pstr = num[0];
+        for(int a = 1; a < n; a++)
+        {
+            tempLen2 = getLen(num[a]);
+            if(tempLen1 < tempLen2)
+            {
+                tempLen1 = tempLen2;
+                pstr = num[a];
+            }
+        }
+        return pstr;
+    }
+    return *num;
+}
+int main()
+{
+    int num1[] = {1, 2, 3, 4, 5, 6};
+    double num2[] = {1.1, 2.2, 3.3, 4.4};
+    char *num3[]={"a", "ab", "abc", "abcr", "abce"};
+    cout << maxn(num1, 6) << endl;
+    cout << maxn(num2, 4) << endl;
+    cout << maxn(num3, 5) << endl;
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c9-1-golf.cpp

@@ -0,0 +1,40 @@
+#include "c9-1-golf.h"
+
+void setgolf(golf &g, const char *name, int hc)
+{
+    int a = 0;
+    while(name[a] != '\0')
+    {
+        g.fullname[a] = name[a];
+        ++a;
+        if(a == Len)
+        {
+            --a;
+            break;
+        }
+    }
+    g.fullname[a] = name[a];
+    g.handicap = hc;
+    return;
+}
+int setgolf(golf &g)
+{
+    int temp = 1;
+    cout << "Please input name character < 40 or n to skip" << endl;
+    cin >> g.fullname;
+    if(g.fullname[0] == 'n' && g.fullname[1] == '\0')
+        temp = 0;
+    cout << "Please input hc" << endl;
+    cin >> g.handicap;
+    return temp;
+}
+void handicap(golf &g, int hc)
+{
+    g.handicap = hc;
+    return;
+}
+void showgolf(const golf &g)
+{
+    cout << g.fullname << endl << g.handicap << endl;
+    return;
+}

C++/codes/2024-07/杨晓宇/c9-1-golf.h

@@ -0,0 +1,46 @@
+#pragma once
+#include <iostream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+const int Len = 40;
+
+struct golf
+{
+    char fullname[Len];
+    int handicap;
+};
+
+/**
+ * @brief 设置golf
+ * 
+ * @param g     设置对象
+ * @param name  修改后的name
+ * @param hc    修改后的hc
+ */
+void setgolf(golf &g, const char *name, int hc);
+
+/**
+ * @brief 交互设置golf
+ * 
+ * @param g    设置对象
+ * @return int 若人名为空返回0，否则返回1
+ */
+int setgolf(golf &g);
+
+/**
+ * @brief 设置handicap
+ * 
+ * @param g    设置对象
+ * @param hc   修改后的handicap值
+ */
+void handicap(golf &g, int hc);
+
+/**
+ * @brief 展示golf数据
+ * 
+ * @param g   展示对象
+ */
+void showgolf(const golf &g);

C++/codes/2024-07/杨晓宇/c9-1.cpp

@@ -0,0 +1,12 @@
+#include "c9-1-golf.h"
+
+
+int main()
+{
+    golf tempGolf;
+    setgolf(tempGolf, "Amy", 1);
+    setgolf(tempGolf);
+    handicap(tempGolf, 2);
+    showgolf(tempGolf);
+    return 0;
+}

C++/codes/2024-07/杨晓宇/c9-2.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cstring>
+
+struct chaff
+{
+    char dross[20];
+    int slag;
+};
+
+int main()
+{
+    char buffer[1024];
+    chaff *num = new (buffer) chaff[2];
+    std::strcpy(num[0].dross, "1111111111");
+    num[0].slag = 1;
+    std::strcpy(num[1].dross, "2222222222");
+    num[1].slag = 2;
+
+    for(int a = 0; a < 2; a++)
+        std::cout << num[a].dross << "    " 
+            << num[a].slag << std::endl;
+    return 0;
+}