UNIT-9 DYNAMIC MEMORY
ALLOCATION
1
,Dynamic Memory Allocation (DMA)
▪ Since C is a structured language, it has some fixed rules for
programming.
▪ One of it includes changing the size of an array. An array is
collection of items stored at continuous memory locations.
▪ As it can be seen that the length (size) of the array above made is
9. But what if there is a requirement to change this length (size).
For Example,
, Dynamic Memory Allocation (DMA)
▪ If there is a situation where only 5 elements are needed to be
entered in this array. In this case, the remaining 4 indices are just
wasting memory in this array. So there is a requirement to lessen
the length (size) of the array from 9 to 5.
▪ Take another situation. In this, there is an array of 9 elements with
all 9 indices filled. But there is a need to enter 3 more elements in
this array. In this case 3 indices more are required. So the length
(size) of the array needs to be changed from 9 to 12.
▪ This procedure is referred to as Dynamic Memory Allocation in C.
ALLOCATION
1
,Dynamic Memory Allocation (DMA)
▪ Since C is a structured language, it has some fixed rules for
programming.
▪ One of it includes changing the size of an array. An array is
collection of items stored at continuous memory locations.
▪ As it can be seen that the length (size) of the array above made is
9. But what if there is a requirement to change this length (size).
For Example,
, Dynamic Memory Allocation (DMA)
▪ If there is a situation where only 5 elements are needed to be
entered in this array. In this case, the remaining 4 indices are just
wasting memory in this array. So there is a requirement to lessen
the length (size) of the array from 9 to 5.
▪ Take another situation. In this, there is an array of 9 elements with
all 9 indices filled. But there is a need to enter 3 more elements in
this array. In this case 3 indices more are required. So the length
(size) of the array needs to be changed from 9 to 12.
▪ This procedure is referred to as Dynamic Memory Allocation in C.
