C++ compile multiple cpp and header files via I. cpp1.cpp cpp2.cpp o

1.The first header file.

//DynamicArray.h
#include <cassert>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
class DynamicArray
{
    private:
    int _size;
    int _max;
    int *_arrayHolder;

    public:
          DynamicArray();
          ~DynamicArray();
          int size();
          int &operator[](int i);
          void add(int n);
          void printArray();
};

2.The first source file

//DynamicArray.cpp
#include <DynamicArray.h>

DynamicArray::DynamicArray()
{
    this->_size=0;
    this->_max=5;
    this->_arrayHolder=new int[5];
}

DynamicArray::~DynamicArray()
{
    delete[] this->_arrayHolder;
}

int DynamicArray::size()
{
    return this->_size;
}

int& DynamicArray:: operator[](int i)
{
     assert(i<this->_size);
     return this->_arrayHolder[i];
}

void DynamicArray:: add(int n)
{
    if(this->_max<this->_size+1)
    {
        this->_max*=2;
        int *tmp=new int[this->_max];
        for(size_t i=0;i<this->_size;i++)
        {
            tmp[i]=this->_arrayHolder[i];
        }

        delete[] this->_arrayHolder;
        this->_arrayHolder=tmp;
        this->_arrayHolder[this->_size]=n*n*n*n;
        this->_size+=1;
    }
    else
    {
        this->_arrayHolder[this->_size]=n*n*n*n;
        this->_size+=1;
    }
}

void DynamicArray:: printArray()
{
    for(int i=0;i<_size;i++)
    {
        printf("Index=%d,value=%d in printArray()\n",i,_arrayHolder[i]);
    }
}

3.The second header file

//MathHelper.h
#include <iostream>
#include <math.h>

using namespace std;

class MathHelper
{
    public:
    int getDouble(int x);
    int getTriple(int x);
    int getSquare(int x);
    int getCube(int x);
};

4.The second source file

//MathHelper.cpp

#include <MathHelper.h>

int MathHelper::getDouble(int x)
{
    return x*2;
}

int MathHelper::getTriple(int x)
{
    return x*3;
}

int MathHelper::getSquare(int x)
{
    return x*x;
}

int MathHelper::getCube(int x)
{
    return x*x*x;
}

5.The key step is to add header files in main  cpp file as below

#include <DynamicArray.h>
#include <MathHelper.h>

6.The main.cpp as below

#include <iostream>
#include <uuid/uuid.h>
#include <vector>
#include <DynamicArray.h>
#include <MathHelper.h>

using namespace std;

void dynamicArr4();
void math5();


int main()
{
    dynamicArr4();
    math5();
    return 0;
}

void math5()
{
    MathHelper mh;

    for(int i=0;i<1000;i++)
    {
        cout<<"Index="<<i<<",value="<<mh.getCube(i)<<endl;
    }
    printf("In math5() method!\n");
}

void dynamicArr4()
{
    DynamicArray dArray;
    vector<int> vArray;

    for(size_t i=0;i<=100;i++)
    {
        dArray.add(i);
    }
    dArray.printArray();
}

6.Caution. Pay more attentio to the -I.   which will include the current directory

When you begin to compile the main cpp file via gcc,it will and the '-I.' (i 'me' uppercase) to include the current directory files as below.

g++ -g -std=c++2a -I. DynamicArray.cpp MathHelper.cpp h1.cpp -o h11 -luuid

7.The compiled result as below 

 8.Run the compiled output

./h11