One of the important tasks that a compiler must perform is to allocate the resources of the target machine to represent the data objects that are being manipulated by the source program. That is, a compiler must decide the run-time representation of the data objects in the source program. Source program run-time representations 00 the data objects, such as integers and real variables, usually take the form of equivalent data objects at the machine level; whereas data structures, such as arrays and strings are represented by several words of machine memory. There are three types of storage strategies which is shown in fig as follows

(1) Static
(2) Stack-based
(3) Heap-based.