I'm practicing C++ by writing matrix manipulation programs, each one being more sophisticated than the one before. (I'm also in linear algebra, so matrices are of specific interest to me)

Anyways, say I wanted the user to make as many matrices as they wanted and then bring them up when desired, but I dont' want to waste a huge amount of memory by making 30 objects at the beginning of the program.

For example, a prompt which asks the user if they want to make another matrix. If they say yes, a new object is THEN created with the users parameters.

Is this possible?

Here's my code right now:

P.S. -> I brought this up in my previous thread on arrays, but the one reply wasn't clear so I thought I'd create a new topic.Code:#include <iostream.h> #include <stdlib.h> // needed for system("PAUSE") class matrix { public: matrix(int,int); // constructor - takes size, aXb, and fills the array with 0's ~matrix(); // destructor - doesn't do much, but still needed void ShowMatrix(); void GetValues(); private: // the following variables are private, which means they // can only be changed by functions/methods within the class itself! int x; int y; int a; int b; int matrix_ar[8][8]; // 8x8 array }; matrix::matrix(int A, int B) { a = A; // sets row size b = B; // set column size for(x = 0; x<8 ; x++) // fills array with 0's { for(y = 0; y<8; y++) { matrix_ar[x][y]=0; } } } matrix::~matrix() { } void matrix::ShowMatrix() // displays the matrix { for(x = 0; x<a; x++) { cout << "| "; for(y = 0; y<b; y++) { cout << matrix_ar[x][y] << "\t"; } cout << " |\n"; } } void matrix::GetValues() { cout << "CON GRAD JOO LAY SHUNS! You've just made a NEW MATRIX!\n"; cout << "The SIZE of your MATRIX is: " << a << "x" << b << endl; cout << "Now you must enter the matrix values! WHOO!\n"; for(x = 0; x<a; x++) { for(y=0; y<b; y++) { cout << "(" << (x+1) << ", " << (y+1) << ")\n" << endl; cin >> matrix_ar[x][y]; } } } int main(int argc, char *argv[]) { // some variables... int a; int b; // program really starts here! cout << "Welcome!\n"; cout << "Enter the size of your matrix:\n"; cout << "Rows: "; cin >> a; cout << endl << "Columns: "; cin >> b; matrix matrix_A(a,b); matrix_A.GetValues(); matrix_A.ShowMatrix(); system("PAUSE"); return 0; }

Thanks!