BCA 2nd Sem notes- Differentiate between Union and structure in c

• UNIT-I (Array)

Definition

Declaration & initialization of 1D 

Accessing array elements

Displaying array elements

Sorting arrays

Arrays and function

Declaration & initialization of 1D

Accessing and Displaying

Memory representation of array [Row Major, Column Major]

Multidimensional array

UNIT-II (Pointers)

Definition

Declaration & initialization

Indirection operator

address of operator

pointer arithmetic

dynamic memory allocation

arrays and pointers

function and pointers

UNIT-III (Strings)

Definition

Declaration & initialization

standard library            function strlen()

  strlen(),strcpy(),       strcat() ,strcmp()

Implementation without using standard library functions

UNIT-IV (Structures)

Definition

Declaration & initialization

Accessing fields

structure operations

Nested structures

Union: Definition  declaration

Differentiate between Union and structure

UNIT-V                                     (C Pre-processor)

Definition
Macro substitution directives
File inclusion directives
Conditional compilation
Bitwise Operators
Shift operators
Masks
Bitfield

UNIT-VI                                (File Handling)

Definition of Files,
Opening modes of files
Standard function
fopen(), fclose(),             feof()  fseek(),                    fewind()
Using text files
fgetc(), fputc(), fscanf()

Differentiate between Union and structure

Structure	Union
Struct keyword is used to define a structure.	Union keyword is used to define a union.
Members do not share memory in a structure.	Members share the memory space in a union.
Any member can be retrieved at any time in a structure.	Only one member can be accessed at a time in a union.
Several members of a structure can be initialized at once.	Only the first member can be initialized.
The size of the structure is equal to the sum of the size of each member.	The size of the union is equal to the size of the largest member.
Altering the value of one member will not affect the value of another.	Change in the value of one member will affect other member values.
Stores different values for all the members.	Stores the same value for all the members.

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