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Working with Typedef in C

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typedef is a keyword in C programming language,which stands for type definition. Typedefs can be used both to:

  • provide more clarity to your code
  • make it easier to make changes to the underlying data types that you use
  • Typedefs can make your code more clear and easier to modify.

One thing to keep in mind when using typedefs is that the underlying type might matter; avoid typedefs, or make them easy to find, when it's important to know the underlying data type

On going through this article, you will understand:

  • How to use typedef?
  • Why and when to use typedef?
  • Difference between typedef and define


The Syntax of using type def is as follows:

typedef <expression you want to replace> <your new name>

Example to replace int with myint:

typedef int myint

Following this, you may use myint in place of int like:

myint data = 123;



typedef int myint;
void main( )
    myint integer = 10;

What are the applications of typedef?

  • typedef can be used to give a name to user defined data type.
typedef struct vehicle
    char name[50];
    char  model[50];
void main( )
    car c1;
    scanf("%s", c1.name);               //BMW
    scanf("%s", c1.model);              // S7
    printf("\nCar name: %s\n",c1.name);
    printf("\nCar Model: %s\n",c1.model);
Car name: BWM
Car Model: S7
  • typedef can be used to give an name to pointers also.
typedef int* IntPtr;

void main( )
    IntPtr x;
    int x_addres = 123;
    x = &x_addres;    
    printf("%p",x);                    // print's 0x7ffdbefa34cc 

Difference between typedef and #define

  • A typedef is the (partial storage-class specifier) compiler directive mainly use with user-defined data types (structure, union or enum) to reduce their complexity and increase the code readability and portability.
typedef unsigned int UnsignedInt;
  • A #define is a pre-processor directive and it replaces the value before compiling the code. #define will just copy-paste the definition values at the point of use, while typedef is actual definition of a new type.
#define Value 10


typedef which of the following may create problem in the program?

Arithmetic operators
All of the mentioned.
Bharat Arya

Bharat Arya

Computer Science Student at University of Petroleum and Energy Studies, Dehradun and Intern at OpenGenus

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Working with Typedef in C
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