USE of  "TYPEDEF" in C-language.

typedef is used to assign user defined name to data types in c. for example if i am too lazy programmer and my team leader assign me a task of developing a program that consist of many variable with long unsigned data type. so in that case i can take help of typedef function available in C.

So i might defined unsigned long as ulong or ul in following way :
The proper format to use is as follow:

typedef   Previous_name  New_name ;

To demonstrate use of typedef function, i have prepared one program having two variable defined by inbuild data type and user defined data type. you will find size of both variable is same.  



#include<stdio.h>
#include<conio.h>

void main()
{

typedef unsigned long ulong;



unsigned long a = 0;
ulong b = 0;

printf("The size to store a inside memory is %d bytes \n ", sizeof(a) );
printf("The size to store b inside memory is %d bytes \n", sizeof(b));

}