What Is Data Types in C: Derived, User-Defined & Modifiers Data Types

Data types play a fundamental role in programming languages, serving as the building blocks for defining variables and organizing data in a structured manner. They specify the type of data that can be stored in a variable and the operations that can be performed on that data. Understanding data types is crucial for writing efficient and bug-free code.

In the realm of C programming, data types form the backbone of the language, providing a foundation for organizing and manipulating data. C is known for its simplicity and efficiency, and data types are central to its design philosophy.

In this article, we will delve into the world of data types in C programming, exploring the various types available, their characteristics, and how they are utilized in practical programming scenarios. From primitive data types to user-defined structures, we will cover a wide range of topics to provide a comprehensive understanding of data types in C. So, let’s embark on this journey to unravel the intricacies of data types in the C programming language.

Primary data types in C

In C programming, primary data types are the fundamental building blocks that represent basic types of data. These data types include integers (int), characters (char), floating-point numbers (float), and double-precision floating-point numbers (double). Understanding these data types is essential for writing efficient and reliable C programs.

Int data type

Syntax: int variable_name;

Example:

#include <stdio.h>

 

int main() {

    int num = 10;

    printf(“The value of num is: %d\n”, num);

    return 0;

}

Char data type

Syntax: char variable_name;

Example:

#include <stdio.h>

 

int main() {

    char ch = ‘A’;

    printf(“The value of ch is: %c\n”, ch);

    return 0;

}

Float data type

Syntax: float variable_name;

Example:

#include <stdio.h>

 

int main() {

    float num = 3.14;

    printf(“The value of num is: %f\n”, num);

    return 0;

}

Double data type

Syntax: double variable_name;

Example:

#include <stdio.h>

int main() {

    double num = 3.141592653589793238;

    printf(“The value of num is: %lf\n”, num);

    return 0;

}

Derived data types in C

In C programming, derived data types are constructed from primary data types to represent more complex structures or functionalities. These derived data types include arrays, functions, and pointers. Understanding these derived data types is crucial for writing efficient and versatile C programs.

Arrays

Arrays are a collection of elements of the same data type stored in contiguous memory locations. They provide a convenient way to store and manipulate a fixed-size sequence of elements.

Syntax: data_type array_name[array_size];

Example:

#include <stdio.h>

 

int main() {

    int numbers[5] = {1, 2, 3, 4, 5};

    printf(“Third element of the array: %d\n”, numbers[2]);

    return 0;

}

Functions

Functions in C are blocks of code that perform a specific task. They encapsulate a sequence of statements that can be executed multiple times with different inputs.

Syntax: return_type function_name(parameter_list) {

    // Function body

}

Example:

#include <stdio.h>

 

int add(int a, int b) {

    return a + b;

}

 

int main() {

    int result = add(5, 3);

    printf(“Result of addition: %d\n”, result);

    return 0;

}

Pointers

Pointers are variables that store memory addresses as their values. They provide a way to indirectly access the memory location of other variables.

Syntax: data_type *pointer_name;

Example

#include <stdio.h>

 

int main() {

    int num = 10;

    int *ptr = &num;

    printf(“Value of num: %d\n”, *ptr);

    return 0;

}

User-defined data types in C

User-defined data types in C allow programmers to create their own custom data types based on their requirements. These data types are defined using structures, unions, and enumerations.

Structures

• Structures allow you to group together variables of different data types under a single name.
• They are defined using the struct keyword followed by the structure name and a list of member variables.
• Each member variable within a structure can have its own data type.
• Structures are useful for representing complex data structures such as employee records, student details, etc.

Example:

struct Employee {

    int empID;

    char name[50];

    float salary;

};

Unions

• Unions are similar to structures, but they share the same memory location for all their member variables.
• Unlike structures, only one member of a union can be accessed at a time.
• Unions are useful when you need to represent a single value that can be interpreted in different ways.

Example:

union Value {

    int intValue;

    float floatValue;

};

Enumerations (Enums)

• Enumerations provide a way to define a new data type consisting of a set of named integer constants.
• Each constant within an enum is automatically assigned a unique integer value, starting from 0 by default, unless specified otherwise.
• Enums are useful when you need to represent a set of related integer values with meaningful names.

Example:

enum Weekdays {

    MON, TUE, WED, THU, FRI, SAT, SUN

};

Overall, user-defined data types in C provide flexibility and allow programmers to create more meaningful and organized data structures to better represent real-world entities and concepts in their programs.

Data type modifiers in C

Data type modifiers in C allow programmers to modify the behavior and properties of primary data types. The main data type modifiers in C include signed, unsigned, long, and short. These modifiers can be applied to integer data types (int, char, long, short) to change their range, memory consumption, and signedness. Data type modifiers are used to optimize memory usage and specify the range of values that a variable can store based on the requirements of the program. Understanding when and how to use these modifiers is important for writing efficient and correct C programs.

Conclusion

We’ve covered essential aspects of data types and modifiers in C programming. Here’s a recap of the key points discussed:

1. Primary Data Types: int, char, float, and double are fundamental data types in C, each with its own range, memory consumption, and format specifier.
2. Derived Data Types: Arrays, functions, and pointers are derived data types that allow for more complex data structures and operations in C.
3. User-Defined Data Types: Structures, unions, and enumerations provide programmers with the ability to create custom data types tailored to specific needs, enhancing code organization and readability.
4. Data Type Modifiers: signed, unsigned, long, and short allow for modification of the behavior and properties of primary data types, optimizing memory usage and specifying value ranges.

It’s important to continue exploring and deepening your understanding of C programming. Whether you’re a beginner or an experienced programmer, there’s always more to learn and discover.

For those looking to expand their knowledge further, Simplilearn offers online courses on C programming and other programming languages. These courses provide comprehensive learning resources and hands-on experience to help you master C programming and advance your career in software development.

If you have any questions, feedback, or queries about the topics covered or anything related to C programming, feel free to reach out. Your input is valuable, and I’m here to assist you on your learning journey.