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1.1 Arrays in Data Structure | Declaration,Initialization, Memory representation
Understanding Memory and Arrays in
Programming
In programming, memory is essentially a long tape of bytes,
with each byte containing 8 bits. This can be extended to both
sides, making it open-ended. To understand the need for
arrays, we need to examine how areas can be declared,
initialized, and represented in memory.
Storing Values in Memory
To store a value in memory, we need to know how much space
will be allocated for it. For example, the data type int typically
takes up 4 bytes to store an integer. The number 5 would need
to be converted to binary, which is 32 bits or 4 bytes. In
traditional compilers, we generally take 2 or 4 bytes to be the
data type for storing numbers. So, if we were storing an
integer, it would take up 2-4 bytes in memory.
The memory manager would allocate some memory for storing
a variable, and the value stored in memory would be
represented in binary. For example, the value stored in a
variable could be 5, which would be represented as 101 in
binary.
Using Arrays
An array is a collection of more than one element of the same
datatype. For example, an array of characters would be of the
data type char, and an array of integers would be of the data
type int. The number of elements in an array is determined by
the size of the array.
To declare an array in programming, we use a specific syntax.
In C language, for example, we would write:
int n;
to declare an integer variable. To declare an array, we would
use:
int a[16];
This creates an array called "a" with 16 elements.
, Initializing Arrays
Arrays can also be initialized with values. For example, we
could initialize an array of integers with the values 1, 2, and 3
like this:
int a[3] = {1, 2, 3};
Representing Arrays in Memory
To represent an array in memory, we need to know how the
elements of the array are stored. In a one-dimensional array,
the elements are stored in a single row with multiple columns.
Each element of the array takes up space in memory,
depending on its data type. For example, an array of integers
would take up 2-4 bytes of memory per element.
Overall, understanding memory and arrays is crucial to
programming, as they are fundamental building blocks of many
programs and applications
1.2 Array Operations - Traversal, Insertion |
Explanation with C Program | DSA Course
Operations on Arrays in Data Structure
In this blog post, we will be discussing the various operations
that can be performed on 1D arrays in data structures. We
have already covered the fundamentals of arrays, including
why they are needed, how to declare them, and their memory
representation in a previous post. Today, we will focus on how
to traverse an array, how to insert data into an array, and the
three types of insertion (at the beginning, at the end, or at a
specific position). The most important operations we will cover
are array traversal, insertion, deletion, sorting, and searching
for a particular key.
Traversal and Insertion with Code Examples
We will start by discussing how to traverse an array and insert
data into an array, with the help of code examples. We will also
provide code for array deletion.
Array Size and Memory Allocation
Before we dive into the code, it's important to understand that
the size of an array is fixed at compile time and cannot be
changed at runtime. Additionally, arrays do not have any
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