添加class的demo
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zhuyijun
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39fe55348c
commit
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base/.gitignore
vendored
1
base/.gitignore
vendored
@ -4,4 +4,5 @@
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.vscode
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/cmake-build-debug
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*.o
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*.exe
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@ -47,6 +47,11 @@ add_executable(external namespacetest/external.cpp)
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add_executable(support namespacetest/support.cpp)
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add_executable(ststic namespacetest/ststic.cpp)
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add_executable(newplace namespacetest/newplace.cpp)
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<<<<<<< HEAD
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add_executable(namessp namespacetest/namessp.cpp)
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add_executable(usestock0 class/usestock0.cpp)
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add_executable(stock20 class/stock20.cpp)
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add_executable(useStock20 class/useStock20.cpp)
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add_executable(useStock20 class/useStock20.cpp)
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=======
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add_executable(namessp namespacetest/namessp.cpp)
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>>>>>>> parent of 39fe553 (添加对象)
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@ -1,34 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#include "stack.h"
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Stack::Stack() {
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top = 0;
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}
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bool Stack::isempty() const {
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return top == 0;
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}
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bool Stack::isfull() const {
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return top == MAX;
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}
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bool Stack::push(const Item &item) {
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if (top < MAX) {
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items[top++] = item;
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return true;
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}
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return false;
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}
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bool Stack::pop(Item &item) {
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if (top > 0) {
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item = items[--top];
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return true;
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}
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return false;
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}
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@ -1,29 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#ifndef BASE_STACK_H
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#define BASE_STACK_H
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typedef unsigned long Item;
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class Stack {
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private:
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enum {MAX=10};
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Item items[MAX];
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int top;
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public:
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//构造函数
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Stack();
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//判断栈是否为空
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bool isempty() const;
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//判断栈是否满了
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bool isfull() const;
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//入栈
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bool push(const Item & item);
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//出栈
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bool pop(Item & item);
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};
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#endif //BASE_STACK_H
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@ -1,50 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#include <iostream>
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#include <cctype>
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#include "stack.h"
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using namespace std;
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int main() {
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Stack st;
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char ch;
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unsigned long po;
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cout << "Please enter A to add a purchase order,\n Pto process a PO,or Q to quit.\n";
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while (cin >> ch && toupper(ch) != 'Q') {
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while (cin.get() != '\n') {
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continue;
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}
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if (!isalpha(ch)) {
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cout << '\a';
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continue;
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}
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switch (ch) {
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case 'A':
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case 'a':
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cout << "Enter a PO number to add: ";
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cin >> po;
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if (st.isfull())
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cout << "stack already full";
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else
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st.push(po);
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break;
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case 'P':
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case 'p':
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if (st.isempty())
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cout << "stack already empty \n";
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else {
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st.pop(po);
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cout << "PO #" << po << " popped\n";
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}
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break;
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}
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cout << "Please enter A to add a purchase order,\n "
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"P to process a PO, or Q to quit,\n";
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}
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cout << "Bye\n";
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return 0;
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}
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@ -1,83 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#include <iostream>
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#include "stock20.h"
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Stock::Stock() {
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company = "no name";
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shares = 0;
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share_val = 0.0;
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total_val = -0.0;
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}
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Stock::Stock(const std::string &co, long n, double pr) {
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company = co;
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if (n < 0) {
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std::cout << "Number of shares can't be nagetive; " << company << " shares set to 0." << std::endl;
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shares = 0;
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} else {
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shares = n;
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}
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share_val = pr;
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set_tot();
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}
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inline void Stock::set_tot() {
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total_val = shares * share_val;
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}
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Stock::~Stock() {
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std::cout << "run " << company << " ~Stock" << std::endl;
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}
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void Stock::buy(long num, double price) {
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if (num < 0) {
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std::cout << "Number of shares purchased can't be negative. Transaction is aborted." << std::endl;
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} else {
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shares += num;
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share_val = price;
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set_tot();
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}
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}
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void Stock::sell(long num, double price) {
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using std::cout;
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if (num < 0) {
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std::cout << "Number of shares purchased can't be negative. Transaction is aborted." << std::endl;
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} else if (num > shares) {
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std::cout << "You can't sell more than you have! Transaction is aborted." << std::endl;
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} else {
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shares -= num;
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share_val = price;
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set_tot();
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}
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}
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void Stock::update(double price) {
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share_val = price;
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set_tot();
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}
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void Stock::show() const {
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using std::cout;
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using std::endl;
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using std::ios_base;
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ios_base::fmtflags orig = cout.setf(ios_base::fixed, ios_base::floatfield);
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std::streamsize prec = cout.precision(3);
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cout << "Company: " << company << endl;
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cout << "shares: " << shares << endl;
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cout << "Share Price: $" << share_val << endl;
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cout.precision(2);
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cout << "Total Worth: $" << total_val << endl;
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cout.setf(orig, ios_base::floatfield);
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cout.precision(prec);
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}
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const Stock &Stock::topval(const Stock &s) const {
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if (s.total_val > total_val) {
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return s;
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}
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return *this;
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}
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@ -1,39 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#ifndef BASE_STOCK20_H
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#define BASE_STOCK20_H
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#include <string>
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class Stock {
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private:
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std::string company;
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int shares;
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double share_val;
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double total_val{};
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void set_tot();
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public:
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Stock();
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Stock(const std::string &co, long n = 0, double pr = 0.0);
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~Stock();
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void buy(long num, double price);
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void sell(long num, double price);
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void update(double price);
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void show() const;
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const Stock &topval(const Stock &s) const;
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};
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#endif //BASE_STOCK20_H
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@ -1,30 +0,0 @@
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//
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// Created by zhuyijun on 2021/8/17.
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//
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#include <iostream>
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#include "stock20.h"
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const int STKS =4;
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int main() {
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Stock stock[STKS]{
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Stock("NanoSmart",12,20.0),
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Stock("Boffo Objects",200,2.0),
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Stock("Monolithic Obelisks",130,3.25),
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Stock("Fleep Enterprises",60,6.5)
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};
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std::cout <<"Stock holdings: \n";
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int st;
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for (st = 0; st < STKS; ++st) {
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stock[st].show();
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}
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const Stock * top = &stock[0];
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for (st = 1; st < STKS; ++st) {
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top = &top ->topval(stock[st]);
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}
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std::cout<< "\n the most valuble holding:\n";
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top->show();
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return 0;
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}
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