C++源码：动态数组实例（2维） / 四六文摘

// C++源码：动态数组实例（2维） Example for DYN ARRAY Class (2d)
//

// ARRAY
#include <iostream.h>
#include <stdlib.h>
const int defau_m=3,defau_n=3;
class IntArray
   {
    protected:
     int size,m,n; //Array size,
   int **pia;
    public:

IntArray () { };                                                  //constructor 1 (default,inline)
     IntArray (int mm=defau_m,int nn=defau_n);   //Constructor 2
     IntArray (const IntArray& );                           //Constructor 3
     ~IntArray ();                                                     //析构函数
     IntArray& operator= (IntArray &);     //reference: for left value
     IntArray operator+ (IntArray &);      // if func use &type is also right: left value
//   IntArray operator- (IntArray &);     // if func use &type is also right: left value
//    IntArray operator* (const IntArray &);     // if func use &type is also right: left value
//     int&       operator[] (int,int);
//     int getsize ()   {return size;}
     void assign (int value,int index1,int index2);
     void chang_s(int mm,int nn);
     void show1 (int index1,int index2);
     void show ();

   };     // End of Class

IntArray::IntArray(int mm,int nn)   // constuctor 2
    {
     m=mm; n=nn; size=m*n;

pia=new int*[m];     // m=rows
     for (int i=0;i<m;i++)   // n=
       pia[i]=new int [n];   //

for (i=0;i<m;i++)       // initalize
       for (int j=0;j<n;++j)
         pia[i][j]=0;
    }

IntArray::IntArray(const IntArray &PA) // constuctor 3 (COPY CONSTRUCTOR)
    {
     m=PA.m; n=PA.n;
     size=m*n;

/*
     for (int i=0;i<m;i++)          //
        delete []pia[i];
      delete []pia;
     //delete pia;
    */

pia=new int*[m];     // m=rows
     for (int i=0;i<m;i++)   // n=
       pia[i]=new int [n];   //

for (i=0;i<m;i++)       // initalize
       for (int j=0;j<n;++j)
         pia[i][j]=0;

// COPY
     for (i=0;i<m;i++)
      for (int j=0;j<n;j++)          //
        pia[i][j]=PA.pia[i][j];        // COPY
    }

IntArray::~IntArray ()                //
     {
      for (int i=0;i<m;i++)
       delete []pia[i];
      delete []pia;
     }

IntArray& IntArray::operator=(IntArray &PA)
{

for (int i=0;i<m;i++)   // Free memery
        delete []pia[i];      //
      delete []pia;             //

int **tempP;
m=PA.m; n=PA.n; // Begin operate
size=PA.size;

tempP=new int* [m];         //
     for (i=0;i<m;i++)              //alloc memery
        tempP[i]=new int[n];   //tempP[i]=new int(n); is NOT right !    //

pia=tempP;

/// for (i=0;i<m;i++)
    for (i=0;i<m;i++)
      for (int j=0;j<n;j++)
        pia[i][j]=PA.pia[i][j];

return *this;

}

// Overload "+"
IntArray IntArray::operator+(IntArray &PA)
{
IntArray tempA(m,n);

for (int i=0;i<m;i++)
       for (int j=0;j<n;j++)
        tempA.pia[i][j]=pia[i][j]+PA.pia[i][j];
     return tempA;
    }

/*   // Overload "-"
IntArray IntArray::operator-(const IntArray &PA)
    {
     IntArray tempA;
     tempA.m=PA.m; tempA.n=PA.n;     // initalize !!
     tempA.size=PA.size;              // initalize !!

if (size!=PA.size)
       {
        cout<<"Can not sub !\n";
        return 1;
       }
     for (int i=0;i<m;i++)
        for (int j=0;j<n;j++)
           tempA.pia[i][j]=pia[i][j]-PA.pia[i][j];
     return tempA;
    }
   */

// Assign ARRAY element a value
   void IntArray::assign(int value,int index1,int index2)
      {
        pia[index1][index2]=value;
      }

// chang   ARRAY size
void IntArray::chang_s(int mm,int nn)   //
    {
    for (int i=0;i<m;i++)
       delete []pia[i];
      delete []pia;

m=mm; n=nn; size=m*n;
int **tempPi;

tempPi=new int*[m]; // m=rows

for ( i=0;i<m;i++) // n=
tempPi[i]=new int (n); // "tempPi" piont to a 2 ARRZAY

pia=tempPi;
for (i=0;i<m;i++)       // initalize
       for (int j=0;j<n;j++)
         pia[i][j]=0;
    }

void IntArray::show1(int index1,int index2)
     {
       cout<<pia[index1][index2]<<" ";
     }

void IntArray::show()
    {
     cout<<"size="<<size<<"\n";
     for (int i=0;i<m;i++)
      {
       for (int j=0; j<n;++j)
         cout<<pia[i][j]<<" ";
       cout<<"\n";
      }
     cout<<"\n\n";    // END MATIX SHOW
    }

main()
{
int m1=1,n1=1,value1,ii,jj;
IntArray A1,A2,A3,A4,A5;

while (m1!=0)
{

// Beginning of   (Input a ARRAY, and display it:)
cout<<"\007"<<"Please input the ARRAY1 size:"<<flush;
cin>>m1>>n1;

// PROCESS USER WANT TO EXIT    (1)
if ((m1==0)||(n1==0))
{
   cout<<" \n\n You want to EXIT !\n    BeCAUSE YOU INPUT 0 0";
   return 1;
}

A1.chang_s(m1,n1); //Creat a ARRAY, and define it's size = m1*n1

m1=m1+1; n1=n1+1;
for (int i=1;i<m1;i++)
   {
    for (int j=1;j<n1;++j)
     {

      cout<<" ARRAY["<<i<<","<<j<<"]="<<flush;
      cin>>value1;
      ii=i;jj=j;
      A1.assign(value1,(ii-1),(jj-1));
     }
    cout<<"\n";
   }
cout<<"\n Call A1.show()\n";
A1.show();

//END OF (Input a ARRAY, and display it:)

// Beginning of    (Input a ARRAY, and display it:)
cout<<"\007"<<"Please input the ARRAY2 size:"<<flush;
cin>>m1>>n1;

// PROCESS USER WANT TO EXIT    (1)
if ((m1==0)||(n1==0))
{
   cout<<" \n\n You want to EXIT !\n    BeCAUSE YOU INPUT 0 0";
   return 1;
}

A2.chang_s(m1,n1); //Creat a ARRAY, and define it's size

m1=m1+1; n1=n1+1;
for (i=1;i<m1;i++)
   {
    for (int j=1;j<n1;++j)
     {
      cout<<" ARRAY["<<i<<","<<j<<"]="<<flush;
      cin>>value1;
      ii=i; jj=j;
      A2.assign(value1,(ii-1),(jj-1));
     }
    cout<<"\n";
   }
A2.show();

//END OF (Input a ARRAY, and display it:)

A3=A1+A2;
// A4=A2-A1;
// A5=A1*A2;

A3.show();

// A4.show();
// A5.show();

} //end of loop {while}

} // end of main()

//注意: 拷贝构造函数需要为当前对象申请空间 !

C++源码：动态数组实例（2维）

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