# C++动态二维数组演示

```#include <iostream>
#include <string>

using namespace std;

void allocate_2D(int **&List, int x, int y, int ycur, int xmax)
{
//makes a temp for saving data that was in the array
int **TEMP = List;
//creates a new array to the right size
List = new int*[x];
for( int i = 0; i < x; i++ )
{
List[i] = new int[y];
for( int j = 0; j < y; j++ )
{
List[i][j] = 0;
}
}
//copies info into newly allocated array
for( int i = 0; i < xmax; i++ )
{
for( int j = 0; j <= ycur; j++ )
{
List[i][j] = TEMP[i][j];
}
}
//deletes the TEMP array
for( int i = 0; i < ycur; i++ )
{
delete[] TEMP[i];
TEMP[i] = 0;
}
delete[] TEMP;
TEMP = 0;
}

int main()
{
string input;
int xsize = 1, ysize = 1;
int xcur = 0, ycur = 0, xmax = 0;
int **List;
cout << "Enter some integers (input 'r' for new row and 's' for stop):" << endl;
while(cin >> input)
{
if( input == "s" ) //done entering values
break;
else if( input == "r" ) //add a row
{
ysize++;
allocate_2D(List, xsize, ysize, ycur, xmax); //makes a new array with another row
xcur = 0;
ycur += 1;
}
else
{
xsize++;
allocate_2D(List, xsize, ysize, ycur, xmax); //makes a new array with another column
List[xcur][ycur] = atoi(input.c_str()); //converts input to integer and adds it to the list
xcur++;
if( xcur > xmax ) //keeps track of the maxium width of the array
xmax = xcur;
}
}
//outputs the array
for( int j = 0; j <= ycur; j++ )
{
for( int i = 0; i < xmax; i++ )
{
cout << List[i][j] << " ";
}
cout << endl;
}
system("PAUSE");
return 0;
}

```

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