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.
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.
