c++ primer plus 第九章答案

最新推荐文章于 2023-04-14 02:35:17 发布

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最新推荐文章于 2023-04-14 02:35:17 发布

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本文介绍了四个使用C++进行结构体操作的例子，包括高尔夫球手信息管理、字符串计数、结构体数组输入输出以及销售数据处理。这些例子涵盖了结构体定义、成员变量设置与获取等基本操作。

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main.cpp

#include <iostream>
#include "golf.h"
using namespace std;
int main()
{
    golf test[5];
    golf otherone;
    for(int i = 0; i < 5; i++)
    {
        if(!setgolf(test[i]))
            return 0;
    }
    setgolf(otherone, "hello world!", 3);
    showgolf(otherone);
    handicap(otheone, 888);
    showgolf();
}

golf.h

#ifndef GOLF_H_INCLUDED
#define GOLF_H_INCLUDED
const int Len = 40;
struct golf
{
    char fullname[Len];
    int handicap;
};
void setgolf(golf & g, const char * name, int hc);
int setgolf(golf & g);
void handicap(golf & g, int hc);
void showgolf(const golf & g);
#endif // GOLF_H_INCLUDED

golf.cpp

#include <iostream>
#include "golf.h"
#include <cstring>
using namespace std;
void setgolf(golf & g, const char * name, int hc)
{
    strcpy(g.fullname, name);
    g.handicap = hc;
}
int setgolf(golf & g)
{
    cout << "Please enter the fullname";
    if(cin.getline(g.fullname,40) && strlen(g.fullname) != 0)
    {
        cout << "Please enter the number";
        cin >> g.handicap;
        cin.get();
        return 1;
    }
    else
    {
        cout << "error";
        return 0;
    }
}
void handicap(golf & g, int hc)
{
    g.handicap = hc;
}
void showgolf(const golf & g)
{
    cout << g.fullname << ' ';
    cout << g.handicap;
    cout << endl;
}

#include <iostream>
#include <string>
using namespace std;
void strcount(const string input);
int main()
{
    string input;
    char next;

    cout << "enter a line:\n";
    getline(cin, input);
    while(cin)
    {
        strcount(input);
        cout << "Enter next line";
        getline(cin, input);
    }
    cout << "bye\n";
    return 0;
}
void strcount(const string input)
{
    using namespace std;
    static int total = 0;
    int count = 0;
    if(input == "")
        cout << "It's blank!!!";
    else
        {
            cout << "\"" << input << "\" contains ";
            cout << input.length() << " letters" << endl;
        }
}

3.方法1

#include <iostream>
#include <new>
using namespace std;
struct chaff
{
    char dross[20];
    int slag;
};
char buffer[512];
int main()
{
    chaff * test = new(buffer) chaff[2];
    for(int i = 0; i < 2; i++)
    {
        cin.getline(test[i].dross,20);
        cin >> test[i].slag;
        cin.get();
    }
    for(int i = 0; i < 2; i++)
        cout << test[i].dross << ' ' << test[i].slag << endl

方法2：

#include <iostream>
#include <new>
using namespace std;
struct chaff
{
    char dross[20];
    int slag;
};
int main()
{
    chaff * test = new chaff[2];
    for(int i = 0; i < 2; i++)
    {
        cin.getline(test[i].dross,20);
        cin >> test[i].slag;
        cin.get();
    }
    for(int i = 0; i < 2; i++)
    {
        cout << test[i].dross << ' ' << test[i].slag << endl;
    }
    return 0;
}

4.main.cpp

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

int main()
{
    double a[3] = {1.1, 2.2, 3.3};
    SALES::Sales s;
    SALES::setSales(s, a, 3);
    SALES::showSales(s);
    SALES::setSales(s);
    SALES::showSales(s);
    return 0;
}

sale.h

#ifndef SALE_H_INCLUDED
#define SALE_H_INCLUDED
namespace SALES
{
    const int QUARTERS = 4;
    struct Sales
    {
        double sales[QUARTERS];
        double average;
        double max;
        double min;
    };
    void setSales(Sales & s, const double ar[], int n);
    void setSales(Sales & s);
    void showSales(const Sales & s);
}



#endif // SALE_H_INCLUDED

sale.cpp

#include "sale.h"
#include <iostream>
using namespace std;
namespace SALES
{
    void setSales(Sales & s, const double ar[], int n)
    {
        int sum = 0;
        int avg, max ,min;
        for(int i = 0; i < n; i++)
        {
            s.sales[i] = ar[i];
            sum += s.sales[i];
        }
        max = min = s.sales[0];
        for(int i = 1; i < n; i++)
        {
            max = max > s.sales[i] ? max : s.sales[i];
            min = min < s.sales[i] ? min : s.sales[i];
        }
        avg = sum / n;
    }
    void setSales(Sales & s)
    {
        double max = 999;
        double min = -999;
        double avg = 0;
        for(int i = 0 ; i < 4 ; ++i)
        {
            cin >> s.sales[i];
            max = max < s.sales[i] ? s.sales[i] : max;
            min = min > s.sales[i] ? s.sales[i] : min;
            avg += s.sales[i];
        }
        s.max = max;
        s.min = min;
        s.average = avg / 4;

    }
    void showSales(const Sales & s)
    {
        for(int i = 0 ; i < 4 ; ++i)
            cout << s.sales[i] << endl;
        cout << "MAX: " << s.max << endl << "MIN: " << s.min  << endl << "AVE: " << s.average << endl;
    }
}