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What is a structure in C?
A user-defined data type that contains a number of data types grouped together.
Provide the syntax for creating a structure.
struct [structure tag] { member definition/declaration; ... } [one or more structure variables];
How do you declare structure variables?
At global declaration section or inside the main function.
What operator is used to access members of a structure?
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How do you declare a structure variable similar to basic data types?
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What is the purpose of the member access operator?
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Which of the following statements correctly describes a structure in C?
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What is the result of accessing a member of a structure using the member access operator?
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Which declaration correctly defines a structure variable in the main function:
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How do you correctly initialize structure variables during declaration?
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What does the term 'structure tag' refer to in the context of creating a structure?
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Study Notes
C Structures
- Structures are user-defined data types in C that group together data of different types.
- They allow organization of related data under a single name, making data management easier.
- Example: A student can have name (string), roll number (int), and marks (float), all grouped as a structure.
Syntax
- Structure declaration format:
struct [structure tag] {
member definition/declaration;
member definition/declaration; ... member definition/declaration;
} [one or more structure variables];
Declaring structure variables/objects
- Variables can be declared before the structure declaration ends (global scope).
- Variables can also be declared within the
mainfunction (local scope). - Example:
struct student s1;(global), orstruct student s2;(local).
Accessing Structure Members
- The member access operator (
.) allows accessing individual members within a structure. - Syntax:
structure variable_name.structure_member_name
Example :
- Structure declaration for a point with x and y coordinates:
struct Point {
int x, y;
};
- Variable declaration:
struct Point p1; // Before semicolon
- Global declaration:
struct Point p2;
- Local declaration and member assignment:
struct Point p3;
p3.x = 43;
p3.y = 65;
- Initializing members within declaration:
struct Point p4 = {10, 20};
C Structure
- A user-defined data type that groups together different data types.
- Data types within a structure may be the same or different.
- Example: A Student structure can contain name (string), roll number (int), and marks (float).
- Syntax:
struct [structure tag] { member definition/declaration; } [one or more structure variables];
Declaring Structure Variables/Objects
- Use the structure name before the semicolon.
- Global declaration: At the global declaration section (Global Scope).
- Local declaration: Inside the main function (Local Scope).
- Syntax:
struct [structure tag] [obj1, obj2, obj3, ...];
Accessing Structure Members
- Use the member access operator (
.) to access individual members. - Syntax:
structure variable_name.structure_member_name - Define structure variables using the
structkeyword.
Example
-
Declaration:
struct Point { int x, y; }p1; // before semicolon -
Global declaration:
struct Point p2; // at global declaration section -
Local declaration:
void main() { struct Point p3; // inside the main function} -
Access members:
p3.x=43; p3.y=65; -
Assignment with initialization:
struct Point p4={10,20};
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Description
This quiz covers the fundamental concepts of structures in C programming, including their definition, syntax, and how to declare and access structure members. Test your understanding of how structures can effectively organize related data in C language.
