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Using Typedef With Structures

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Introduction :

1. It allows us to introduce synonyms for data types which could have been declared some other way.
2. It is used to give new name for the structure.
3. New name is used for Creating instances,passing values to function,declaration etc...

typedef int XYZ;  
XYZ age;
XYZ roll;

Explain ?

1. New name given for integer is XYZ.
2. 'XYZ' and 'int' are now synonyms.
3. 'age' is of type XYZ i.e of integer type.

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Example 1 :

typedef struct
{
char ename[30];
int ssn;
int deptno;
}employee;

Example 2 :

typedef struct Rec
{
char ename[30];
int ssn;
int deptno;
}employee;

What we have done ?

1. Consider Example 2, Rec is tag-name.
2. 'employee' is nothing but new data type.
3. We can now create the variables of type 'employee'
4. Tag name is optional .

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Live Example :

typedef struct b1
{
char bname[30];
int ssn;
int pages;
}book;
book b1,b2,b3; 

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Tags / Keywords : | structure, typedef

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