What is two dimensional array in c plus plus?

Answer 1

A one-dimensional array is simply a series of values.

int a[10]; // A series of 10 integers.

Multi-dimensional arrays are the same, there's just more series involved. A two-dimensional array is simply a series of one-dimensional arrays.

int b[10][10]; // 10 elements of 10 integers each.

A two-dimensional array is easiest to imagine as a chessboard or a sudoku grid or graph paper, with width and depth:

int sudoku[9][9]; // A 9*9 grid.

Elements of a 2 dimensional array are accessed by rank and file, or column and row, or X and Y coordinates, whichever is appropriate.

int x = sudoku[3][5]; // Access the value at row 3, column 5.

2 dimensional arrays needn't be square, they can be rectangular:

int y = rectangle[5][10]; // Array of 5 elements with 10 values each.

A three-dimensional array is akin to a cuboid, or multiple chessboards stacked on top of each other. Each "cell" is accessed 3 dimensionally, via width, depth and height, or X, Y and Z coordinates.

int cuboid[100][20][10;

int X=4,Y=5,Z=7;

int f=cuboid[X][Y][Z];

A four-dimensional array is very much like a one-dimensional array, except each element is now a three-dimensional cuboid. Five dimensions is like a chessboard, where each square is now cuboid, and 6 dimensions is a cuboid where each cell is a cuboid. And so on. A case of divide and subdivide.