1.1 Arrays in Data Structure | Declaration,
Initialization, Memory representation
Jenny's Lectures CS IT
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];
Initialization, Memory representation
Jenny's Lectures CS IT
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];
