how to inset a new array to my jagged array

Question

hello i will much apreciate any help.

ok let\'s see, first i have declare a jagged array like this and the next code

int n=1, m=3,p=0;

int[][] jag_array         


        

Answer 1

The size of an array, once created, is by definition invariable. If you need a variable number of elements, use a List - in your case, probably a List.

The only alternative solution would be to created a new array with the new size (and assign that to your jag_array variable) and copy all the previous elements from your old array into the new array. That is unnecessarily complicated code when you can just use List, but if you cannot use List for any reason, here is an example:

// increase the length of jag_array by one
var old_jag_array = jag_array; // store a reference to the smaller array
jag_array = new int[old_jag_array.Length + 1][]; // create the new, larger array
for (int i = 0; i < old_jag_array.Length; i++) {
    jag_array[i] = old_jag_array[i]; // copy the existing elements into the new array
}
jag_array[jag_array.Length - 1] = ... // insert new value here