typedef using structures

Type definitions and structures

Type definitions make it possible to create your own variable types. In the following example we will create a type definition called “intpointer” (a pointer to an integer):

 #include<stdio.h>

 typedef int *int_ptr;

 int main()
 {
  int_ptr myvar;
  return 0;
 }

It is also possible to use type definitions with structures. The name of the type definition of a structure is usually in uppercase letters. Take a look at the example:

 #include<stdio.h>

 typedef struct telephone
 {
  char *name;
  int number;
 }TELEPHONE;

 int main()
 {
  TELEPHONE index;

  index.name = "Jane Doe";
  index.number = 12345;
  printf("Name: %s\n", index.name);
  printf("Telephone number: %d\n", index.number);

  return 0;
 }

Note: The word struct is not needed before TELEPHONE index;