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<T> - in your case, probably a List<int[]>.

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<T>, but if you cannot use List<T> 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