HTML tutorial
CSS3 tutorial
Bootstrap tutorial
JavaScript tutorial
JQuery tutorial
AngularJS tutorial
React tutorial
NodeJS tutorial
PHP tutorial
Python tutorial
Python3 tutorial
Django tutorial
Linux tutorial
Docker tutorial
Ruby tutorial
Java tutorial
C tutorial
C ++ tutorial
Perl tutorial
JSP tutorial
Lua tutorial
Scala tutorial
Go tutorial
ASP.NET tutorial
C # tutorial
C language provides atypedef keywords, you can use it to take a new name for the type.The following example defines a termBYTE is a single byte numbers:
typedef unsigned char BYTE;
After this type definition, it can be used as an identifier BYTEunsigned char type abbreviation, such as:
BYTE b1, b2;
By convention, the definition will be capitalized letters in order to alert the user to type a symbolic name is an abbreviation, but you can also use lowercase letters, as follows:
typedef unsigned char byte;
You can also usetypedef to custom data types to take a new name for the user.For example, you can use the structure typedef to define a new data type, and then use this new data type to define the structure of direct variables, as follows:
#include <stdio.h> #include <string.h> typedef struct Books { char title[50]; char author[50]; char subject[100]; int book_id; } Book; int main( ) { Book book; strcpy( book.title, "C Programming"); strcpy( book.author, "Nuha Ali"); strcpy( book.subject, "C Programming Tutorial"); book.book_id = 6495407; printf( "Book title : %s\n", book.title); printf( "Book author : %s\n", book.author); printf( "Book subject : %s\n", book.subject); printf( "Book book_id : %d\n", book.book_id); return 0; }
When the above code is compiled and executed, it produces the following results:
Book title : C Programming Book author : Nuha Ali Book subject : C Programming Tutorial Book book_id : 6495407
C#define directive is used to define an alias for a variety of data types, and typedefsimilar, but they have the following differences:
Here is the simplest use of #define:
#include <stdio.h> #define TRUE 1 #define FALSE 0 int main( ) { printf( "Value of TRUE : %d\n", TRUE); printf( "Value of FALSE : %d\n", FALSE); return 0; }
When the above code is compiled and executed, it produces the following results:
Value of TRUE : 1 Value of FALSE : 0