typedef c struct
A typedef
in C is used to create an alias or a new name for an existing data type. It allows you to define a new name for a complex data type, making your code more readable and easier to understand. The syntax for typedef
is as follows:
typedef existing_data_type new_data_type;
Here's an example that demonstrates how to use typedef
with a structure:
typedef struct {
int id;
char name[20];
float salary;
} Employee;
In this example, a new data type Employee
is created using typedef
. It is an alias for the struct
that defines the fields id
, name
, and salary
.
By using typedef
, you can now declare variables of type Employee
without using the struct
keyword:
Employee emp1;
emp1.id = 1;
strcpy(emp1.name, "John");
emp1.salary = 5000.0;
This makes the code more concise and easier to read.
You can also use typedef
to create aliases for other data types, such as pointers or function pointers. For example:
typedef int* IntPtr;
typedef void (*FuncPtr)(int);
In the above example, IntPtr
is an alias for int*
, and FuncPtr
is an alias for a function pointer that takes an int
parameter and returns void
.
Using typedef
can make your code more expressive and easier to understand, especially when dealing with complex data types or function pointers.