课堂上给我布置了作业:
到目前为止，我已经编写了程序并修复了大多数错误，但是无论我尝试什么，我都一直得到"在此范围内未声明的函数"错误。该程序包括以下文件:编写程序，使用指针创建和管理数组。主程序只能通过各种函数与指针/数组交互。然后，这些函数将限制数组的使用，以正确处理它们。例如，这些函数将消除超出数组边界的可能性。
main.cpp、MyArray.cpp、MyArray.h
main.cpp
#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
MyArray.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(我将复制粘贴准确的错误，但我不能从我用来连接到远程主机的终端复制粘贴，我编译我的代码)
我一直在试图解决这个问题几个小时，我不能弄清楚，我甚至看了其他Stack帖子像'foo'没有在这个范围内声明c++
感谢您的帮助。
main.cpp也不是我写的，它是分配给我的
在c++中，A类的函数foo可以被A.foo()或A_ptr->foo()调用，而foo()则不能。
我认为这里不需要类，使用自由函数就可以了。
如果您确实想使用MyArray类，则不需要在main.cpp中编写int *Array1, *Array2;并将其作为参数传递。也许最好将数组存储在MyArray类中。
就像这样。
main.cpp
#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
MyArray.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;
}
}
我忽略了你的解决方案中的一些函数以及析构函数，你应该使用delete[]
找一本关于c++的书并学习它。您需要创建一个MyArray对象，并使用对象调用函数:
MyArray myArr;
myArr.CreateArray(Array1, Array1Size);
如果给出了main，你的createArray将不得不在内部创建数组:
MyArray myArr;
void CreateArray(int *array, int size)
{
return myArr.CreateArray(array, size);
}
首先你要明白什么是类。在你的例子中，要调用MyArray函数你必须有一个MyArray类的实例:
MyArray a;
a.CreateArray(...);
...