what is indexing?

Question

it is the topic in lesson addressing methods & program sequencing i want a definition for that

Answer 1

Indexing is another word for "subscripting" in some contexts. In hardware addressing, it is a way of using a computer's hardware registers to hold the index (=offset or subscript) to a particular byte. Also works the other way.

In "addressing" you can talk about an instruction that has a two-part address. One part is the base or offset and the other is the index register reference. The address in the given instruction, when processed, acts on the memory resident value for which the address is the sum of the instruction's base and the current contents of the selected register.

In program sequencing, an index can be used in terms of a computed branch or indirect branch. It can also be used in terms of simple subscripting or loop counting. I.e. you wanted to do something 20 times - use a counter that starts at 1 and eventually reaches 20. Some authorities call that counter the loop's index.

Answer 2

subscripting is indexing