Course Content

C Structs

1. Introduction to Structs

What are Structs Structs Application Defining and Declaring Structs Creating Your First Struct Accessing Struct Fields

2. Pointers and Structs

Pointers Brief Overview Pointers to Structs Pointers Inside Structs Dynamically Allocating Structs Passing Structs to the Functions

3. Structs and Memory

Understanding Memory Layout of Structs Alignment and Padding in Structs Unions Arrays with Structs

4. Advanced Structs Usage

Nested Structs Struct with Arrays and Other Structs Anonymous Struct and Union Complex Data Structure

5. Implementing Data Structures

Introduction to Linked List Basic Concept and Structure Building a Linked List Travesting and Displaying Linked List Completion Overview

Anonymous Struct and Union

The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.

Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.

You can use anonymous structs/unions when they are nested and will only be used where they are declared.

main


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#include <stdio.h>

struct ASCIItable {
    // Anonymous union
    union {
        char symbol;
        int num;
    };
};

int main()
{
    struct ASCIItable AZtable;
    AZtable.num = 65;

     // number 65 is first symbol `A`,
     // number 97 is last `Z` symbol, hence 97 - 65 = 25, 
     // so 26 iterations required (including number 0)

    for (int i = 0; i < 26; i++)
        printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i);

    return 0;
}

Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an ASCIItable structure, you can interpret the same value as a character (using symbol) or as a numeric value (using num). This can be useful when you need to quickly switch between different data views.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 4. Chapter 3

Anonymous Struct and Union

The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.

Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.

You can use anonymous structs/unions when they are nested and will only be used where they are declared.

main


              123456789101112131415161718192021222324
            
#include <stdio.h>

struct ASCIItable {
    // Anonymous union
    union {
        char symbol;
        int num;
    };
};

int main()
{
    struct ASCIItable AZtable;
    AZtable.num = 65;

     // number 65 is first symbol `A`,
     // number 97 is last `Z` symbol, hence 97 - 65 = 25, 
     // so 26 iterations required (including number 0)

    for (int i = 0; i < 26; i++)
        printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i);

    return 0;
}

Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an ASCIItable structure, you can interpret the same value as a character (using symbol) or as a numeric value (using num). This can be useful when you need to quickly switch between different data views.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 4. Chapter 3

Anonymous Struct and Union

The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.

Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.

You can use anonymous structs/unions when they are nested and will only be used where they are declared.

main


              123456789101112131415161718192021222324
            
#include <stdio.h>

struct ASCIItable {
    // Anonymous union
    union {
        char symbol;
        int num;
    };
};

int main()
{
    struct ASCIItable AZtable;
    AZtable.num = 65;

     // number 65 is first symbol `A`,
     // number 97 is last `Z` symbol, hence 97 - 65 = 25, 
     // so 26 iterations required (including number 0)

    for (int i = 0; i < 26; i++)
        printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i);

    return 0;
}

Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an ASCIItable structure, you can interpret the same value as a character (using symbol) or as a numeric value (using num). This can be useful when you need to quickly switch between different data views.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.

Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.

You can use anonymous structs/unions when they are nested and will only be used where they are declared.

main


              123456789101112131415161718192021222324
            
#include <stdio.h>

struct ASCIItable {
    // Anonymous union
    union {
        char symbol;
        int num;
    };
};

int main()
{
    struct ASCIItable AZtable;
    AZtable.num = 65;

     // number 65 is first symbol `A`,
     // number 97 is last `Z` symbol, hence 97 - 65 = 25, 
     // so 26 iterations required (including number 0)

    for (int i = 0; i < 26; i++)
        printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i);

    return 0;
}

Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an ASCIItable structure, you can interpret the same value as a character (using symbol) or as a numeric value (using num). This can be useful when you need to quickly switch between different data views.

Task

Create an anonymous structure;
Declare three float fields in it with the names x, y, radius;
Define the fields of the structure instance;
Display the values of the structure fields.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 4. Chapter 3

Switch to desktop for real-world practiceContinue from where you are using one of the options below