|
|||
| Products Download Events Support Videos | |||
Technical Support
On-Line Manuals
C251 User's Guide
C251 Introduction
Compiling Programs
Language Extensions
Keywords
Memory Areas
Program Memory
Internal Data Memory
External Data Memory
Near Memory
Far Memory
Huge Memory
SFR Memory
Memory Models
Tiny Model
XTiny Model
Small Model
XSmall Model
Large Model
Memory Types
Implicit Memory Types
bdata
code
data
ebdata
far
huge
idata
near
xdata
Data Types
Special Function Registers
sfr
sfr16
sbit
Bit-Addressable Objects
bit
Standard C Types
void
char
int
enum
float
double
Type Modifiers
signed
unsigned
short
long
Type Qualifiers
const
volatile
Storage Classes
auto
register
extern
static
Absolute Variable Location
Pointers
Memory Type in Pointer Declarations
Pointer Conversions
Function Declarations
Memory Models
Register Banks
Interrupt Functions
Reentrant Functions
Alien (PL/M-51) Function
Real-Time Function Tasks
Attributes
aligned(n)
noreturn
Preprocessor
Advanced Programming
Error Messages
Library Reference
Appendix
C251 User's Guide
extern
The extern storage class declares a global variable that is defined in another source module. It is used as follows:
extern data-type name;
Where
| data-type | is the data type of the variable. |
| name | is the name of the variable. |
When you use extern to declare a variable, the variable cannot be initialized (it is already initialized where it is defined).
ProductsDevelopment Tools |
Hardware & Collateral |
Downloads |
Support |
Buy |
|
 |
|||
