Question

I have an array in the form of ‘int[][]‘ that represents the co-ordinates of a small grid. Each co-ordinate has been assigned its own value. eg array[0][4] = 28……

I have two questions. Firstly, how do I iterate through all the stored values. Secondly, I want to be able to input a value and have its specific co-ordinates in the grid returned. What would be the best way to approach this?

Thank you for any help!

Answer 1

You can iterate with either for loops or enhanced for loops:

for (int row=0; row < grid.length; row++) {     for (int col=0; col < grid[row].length; col++)     {         int value = grid[row][col];         // Do stuff     } } 

or

// Note the different use of 'row' as a variable name! This // is the *whole* row, not the row *number*. for (int[] row : grid) {     for (int value : row)     {          // Do stuff     } } 

The first version would be the easiest solution to the ‘find the co-ordinates’ question – just check whether the value in the inner loop is correct.