1

我在课堂上被分配了一项任务:

编写一个程序,通过使用指针来创建和管理数组。您的主程序应仅通过各种函数与指针/数组交互。然后,这些函数会将数组的使用限制为正确处理。例如,这些函数将消除超出数组边界的可能性。

到目前为止,我已经编写了程序并修复了大部分错误,但是无论我尝试什么,我都会不断收到“未在此范围内声明的函数”错误。该程序包括以下文件:main.cpp MyArray.cppMyArray.h

主文件

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

using namespace std;

int main(int argc, char * argv[]) {
    int *Array1, *Array2;
    int Array1Size(10), Array2Size(10);
    int Array1Value(0), Array2Value(0);

    cout << "Enter Size and Initial value for Array1: ";

    cin >> Array1Size >> Array1Value;

    cout << "Enter Size and Initial value for Array2: ";

    cin >> Array2Size >> Array2Value;

    CreateArray(Array1, Array1Size);
    InitArray(Array1, Array1Size, Array1Value);

    CreateArray(Array2, Array2Size);
    InitArray(Array2, Array2Size, Array2Value);

    cout << "Printing Array1:" << endl;
    PrintArray(Array1, Array1Size);
    cout << endl;
    cout << "Printing Array2:" << endl;
    PrintArray(Array2, Array2Size);
    cout << endl;

    if(CopyArray(Array1, Array1Size, Array2, Array2Size)) {
        cout << "Copy was successful" << endl;
    } else {
        cout << "Copy was not successful" << endl;
    }

    cout << "Printing Array1:" << endl;

    PrintArray(Array1, Array1Size);

    cout << endl;

    EnterArray(Array1, Array1Size);

    // MergeArray(Array1, Array1Size, Array2, Array2Size);

    cout << "Printing Array1:" << endl;
    PrintArray(Array1, Array1Size);

    cout << endl;

    return 0;
}

MyArray.h

#ifndef _MyArray_h_included_
#define _MyArray_h_included_

class MyArray
{
    public:
        void CreateArray(int *array, int size); 
        /*
        CreateArray(int *array, int size): Will accept a pointer to an array, and the size of the array and will allocate the appropriate amount of memory for the array
        */
        void InitArray(int *array, int size, int value);
        /*
        InitArray(Array1, Array1Size, Array1Value): Will initialize the contents of the arry Array1 to the value Array1Value
        */
        void PrintArray(int *array, int size);
        /*
        PrintArray(Array1, Array1Size): Will print the contest of the Array1
        */
        bool CopyArray(int *arrayOne, int sizeOne, int *arrayTwo, int sizeTwo);
        /*
        CopyArray(Array1, Arrary1Size, Array2, Array2Size): Will copy the contents of Array2 to Array1 iff the two arrays are of equal size. If the copying process is successfully completed, then a value of 1 is returned, otherwise a value of 0 is returned.
        */
        void EnterArray(int *array, int size);
        /*
        EnterArray(Array1, Array1Size): Will populate the Array1 from the stdin by prompting the user to enter all elements of the array.
        */
    };
#endif

我的数组.cpp

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

using namespace std;

void MyArray::CreateArray(int *array, int size) {
    array = new int[size];
}

/*
CreateArray(int *array, int size): Will accept a pointer to an array, and the size of the array and will allocate the appropriate amount of memory for the array
*/
void MyArray::InitArray(int *array, int size, int value) {
    for(int index(0); index < size; index++) {
        array[index] = value;
    }
}

/*
InitArray(Array1, Array1Size, Array1Value): Will initialize the contents of the arry Array1 to the value Array1Value
*/
void MyArray::PrintArray(int *array, int size) {
    for(int index(0); index < size; index++) {
        cout << "Value of index: " << index << " is " << array[index] << endl;
    }
}

/*
PrintArray(Array1, Array1Size): Will print the contest of the Array1
*/
bool MyArray::CopyArray(int *arrayOne, int sizeOne, int *arrayTwo, int sizeTwo) {
    if(sizeOne != sizeTwo) {
        return false;
    } else {
        for(int index(0); index < sizeTwo; index++) {
            arrayOne[index] = arrayTwo[index];
        }

        return true;
    }
}

/*
CopyArray(Array1, Arrary1Size, Array2, Array2Size): Will copy the contents of Array2 to Array1 iff the two arrays are of equal size. If the copying process is successfully completed, then a value of 1 is returned, otherwise a value of 0 is returned.
*/
void MyArray::EnterArray(int *array, int size){
    int index(0);

    while(index < size) {
        int value(0);
        cout << "Enter the value for index: " << index + 1 << endl;
        cin >> value;
        array[index] = value;
    }
}
/*
EnterArray(Array1, Array1Size): Will populate the Array1 from the stdin by prompting the user to enter all elements of the array.
*/

我得到的错误类似于:(main.cpp:'LineNumber': error. 'Every Function in MyArray.cpp' was not declared in this scope我会复制粘贴确切的错误,但如果我编译我的代码,我无法从我用来连接到远程主机的终端复制粘贴)


我一直在尝试解决这个问题几个小时,但我无法弄清楚,我什至查看了其他 Stack 帖子,例如'foo' 未在此范围内声明 c++
任何帮助将不胜感激,谢谢。

另外我没有写main.cpp,它是随作业给出的。

4

3 回答 3

2

在 C++ 中,foo一个类的函数A可以被A.foo()or调用A_ptr->foo(),只是 afoo()不起作用。

我认为您在这里不需要课程,只需使用免费功能即可。

如果您确实想使用一个MyArray类,则无需int *Array1, *Array2;在 main.cpp 中编写并将其作为 arg 传递。最好将数组存储在MyArray类中。

像这样。

主文件

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

using namespace std;

int main(int argc, char * argv[]) {
    //int *Array1, *Array2;
    MyArray Array1;

    int Array1Size(10);
    int Array1Value(0);

    cout << "Enter Size and Initial value for Array1: ";

    cin >> Array1Size >> Array1Value;

    Array1.CreateArray(Array1Size);
    Array1.InitArray(Array1Size, Array1Value);

    cout << "Printing Array1:" << endl;
    Array1.PrintArray(Array1Size);
    cout << endl;

    return 0;
}

MyArray.h

#ifndef _MyArray_h_included_
#define _MyArray_h_included_

class MyArray
{
    public:
        void CreateArray(int size); 

        void InitArray(int size, int value);

        void PrintArray(int size);

    private:
        int *m_array;

    };
#endif

我的数组.cpp

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

using namespace std;

void MyArray::CreateArray(int size) {
    m_array = new int[size];
}


void MyArray::InitArray(int size, int value) {
    for(int index(0); index < size; index++) {
        m_array[index] = value;
    }
}


void MyArray::PrintArray(int size) {
    for(int index(0); index < size; index++) {
        cout << "Value of index: " << index << " is " << m_array[index] << endl;
    }
}

我忽略了您的解决方案中的一些函数以及您应该使用的析构函数delete[]

于 2013-03-05T09:42:20.027 回答
1

买一本关于 C++ 的书并学习它。您需要创建一个 MyArray 对象并使用该对象调用函数:

MyArray myArr;

myArr.CreateArray(Array1, Array1Size);

ETC

如果给出 main ,您的 createArray 将必须在内部创建数组:

MyArray myArr;

void CreateArray(int *array, int size)
{
    return myArr.CreateArray(array, size);
}
于 2013-03-05T06:42:57.373 回答
0

首先你要明白什么是类。在您的情况下,要调用您的 MyArray 函数,您必须有一个 MyArray 类的实例:

MyArray a;
a.CreateArray(...);
...
于 2013-03-05T06:47:06.447 回答