Question

首先，我知道你会说这是一个已知且已经解决的问题，但我尝试了这样做，并得到一个输出，即常量字符串不是数组的一部分。

具体来说，我添加了一个名为The_Vale的数组元素，当我执行包含The_Vale字符串的显示函数时，它表示＆＃34; The_Vale不属于Westeros＆＃34;。

代码对我来说很好，我不知道问题出在哪里。你能帮我解决void display(Kingdom* a, int index, const char *n)这个功能吗？其他重载函数工作正常。

#include <iostream>

#include "kingdom.h"

namespace westeros {

// TODO:definition for display(...) 

void display(Kingdom& p) {
    cout << p.m_name << ", population " << p.m_population << endl;
}
void display(Kingdom* a, int index) {

    int i;
    int total_pop = 0;
    cout << "------------------------------" << endl;
    cout << " Kingdoms of Westeros" << endl;
    cout << "------------------------------" << endl;
    for (i = 0; i < index; i++) {
        total_pop += a[i].m_population;
        cout << i + 1 << "." << a[i].m_name << ", population " << a[i].m_population << endl;
    }
    cout << "------------------------------" << endl;
    cout << "Total population of Westeros :" << total_pop << endl;
    cout << "------------------------------" << endl;
}

void display(Kingdom* a, int index, int min) {
    int i;
    cout << "------------------------------" << endl;
    cout << "Kingdoms of Westeros with more than" << min << " people" << endl;
    cout << "------------------------------" << endl;
    for (i = 0; i < index; i++) {
        if (a[i].m_population >= min) {
            cout << a[i].m_name << ", population " << a[i].m_population << endl;
        }
    }
    cout << "------------------------------" << endl;
}
***void display(Kingdom* a, int index, const char *n) {
    int i;
    int found;
    cout << "------------------------------" << endl;
    cout << "Searching for kingdom " << n << " in Westeros" << endl;
    cout << "------------------------------" << endl;
    for (i = 0; i < index; i++) {
        cout << a[i].m_name << " is being compared to " << n << endl;
        if (a[i].m_name == n) {
            found = 1;
            cout << a[i].m_name << ", population " << a[i].m_population << endl;
        }
        else {
            found = 0;
        }
    }
    if (found == 1) {
        cout << a[i].m_name << ", population " << a[i].m_population << endl;
    }
    if (found == 0) {
        cout << n << " is not part of Westeros." << endl;
    }
    cout << "------------------------------" << endl;
}***
}

我在我的主.cpp文件中调用该函数。

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

using namespace std;
using namespace westeros;

int main(void)
{
    int count = 0; // the number of kingdoms in the array

    // TODO: declare the pKingdoms pointer here (don't forget to initialize it)
    Kingdom* pKingdoms = NULL;

    cout << "==========" << endl
        << "Input data" << endl
        << "==========" << endl
        << "Enter the number of kingdoms: ";
    cin >> count;
    cin.ignore();

    // TODO: allocate dynamic memory here for the pKingdoms pointer
    pKingdoms = new Kingdom[count];

    for (int i = 0; i < count; ++i)
    {
        // TODO: add code to accept user input for the pKingdoms array
        cout << "Enter the name for kingdom #" << i + 1 << ": ";
        cin >> pKingdoms[i].m_name;
        cout << "Enter the number people living in " << pKingdoms[i].m_name << ": ";
        cin >> pKingdoms[i].m_population;
    }
    cout << "==========" << endl << endl;


    // testing that "display(...)" works
    cout << "------------------------------" << endl
        << "The first kingdom of Westeros" << endl
        << "------------------------------" << endl;
    display(pKingdoms[0]);
    cout << "------------------------------" << endl << endl;


    // testing that the first overload of "display(...)" works
    display(pKingdoms, count);
    cout << endl;


    // testing that the second overload of "display(...)" works
    display(pKingdoms, count, 345678);
    cout << endl;


    // testing that the third overload of "display(...)" works
    display(pKingdoms, count, "Mordor");
    cout << endl;

    display(pKingdoms, count, "The_Vale");
    cout << endl;

    // TODO: deallocate the dynamic memory here
    delete[] pKingdoms;

    return 0;
}

最后，我的kingdom.h文件中包含的结构是：

namespace westeros {
struct Kingdom {
    char m_name[9];
    int m_population;
};
void display(Kingdom& p);
void display(Kingdom* a, int index);
void display(Kingdom* a, int index, int min);
void display(Kingdom* a, int index, const char *n);

Answer 1

您需要使用strcmp之类的内容来比较2个字符串的内容;事实上，你正在比较他们在内存中的位置，（正如你所看到的）是不一样的。

将对象成员数组与字符串

1 个答案: