2D array syntax
How can i declare a 2 D array in Visual Studio C++ 6.0 ?
my code is giving errror;
Code:class sparseadd { int *p; int row; int col; struct node { int val; }; public: sparseadd(int, int ); }; sparseadd::sparseadd(int r, int c) { row = r; col = c; p = new int [r][c]; }
You're not declaring a two dimensional array, you're simulating one with dynamic memory and pointers:
Code:// Declaration int **p;Code:// Constructor p = new int[r]; for (int i = 0; i < row; i++) p[i] = new int[col];p.s. I strongly recommend you ditch Visual C++ 6.0. It's very crappy as a C++ compiler.Code:// Destructor for (int i = 0; i < row; i++) delete[] p[i]; delete p;
My best code is written with the delete key.
yeah it worked out well!but now how i will pass this 2 D array as a function parameter if i have to decide on runtime the colommn size of the array after reading from the file?
>how i will pass this 2 D array as a function parameter if i have to decide on runtime the colommn size of the array
That's the whole point of simulating an array in this case. You're using a pointer to a pointer (which doesn't require any dimension sizes) and can pass it to a function as-is. Though I'd recommend passing the size as well, in separate parameters:
Code:void foo(int **p, int rows, int cols);
My best code is written with the delete key.
