User defined type

User defined type is a way from which help an user can create variables of own type.

There is two way  for creating user defind data type:

1.       Using typedef  keword

2.       Using enum keyword(enumerated data type).

1.typedef----

       typedef existing_data_type new_userdefined_type;

e.g

typedef int krish;

krish a,b,c;/* a,b,c are integer variable*/

we can further use keyword typedef to create new data type from datatype being used as:

 typedef krish kg;

kg l,m;  /* l,m are integer variable*?/

typedef with structures:

typedef struct class

{

……..

……..

} my;

function()

{

class  var1,var2; /*simple object declaration*/

my var3;        /*declaration using dublicate datatype i.e user type*/

}

2.Enumerated datatype:

Enum cricket(sachin,rahul,shehbag,…..,dhoni);

cricket a,b,c;

a=sachin;  /*valid*/

b=10;  /*invalid*/

c=jaysurya;  /*invalid*/

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