How can we add elements to a particular position in an already established array?

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To add elements to a particular position in an already established array in most programming languages, you can use the following syntax:

array_name[index] = value;

where array_name is the name of your array, index is the position where you want to add the element, and value is the value you want to add.

For example, suppose you have an array named myArray and you want to add the value 10 to the third position. You can do this by writing:

myArray[2] = 10;

Note that the index starts at 0, so the third position has an index of 2. Also, when you add an element to a particular position in an array, it will overwrite any existing value at that position.