Write examples of declarations of external variables, Computer Engineering

Assignment Help:

Examples of declarations of external variables  that  are  not definitions:

extern char stack[10];

extern int stkptr;

These declarations tell the compiler that the variables stack[] and stkptr are defined elsewhere, usually in some other file. If the keyword extern were omitted, the variables would be considered to be new ones and memory would be allocated for them. Remember, access to the same external variable defined in another file is possible only if the keyword extern is used in the declaration.

/* File : ext.c

This example shows reference to an external variable in more than one file. The program is organized in three files. The external variable 'a1' is defined in 'ext.c', and it is declared as extern in 'FILE3.c' */

 

 


Related Discussions:- Write examples of declarations of external variables

What do you understand by a file system, Problem (a) What do you mean...

Problem (a) What do you meant by a file system? (b) Mention the five categories of data for a basic file system reference model. What is the use of such a reference model

How many octets does smallest possible ipv6 datagram contain, How many Octe...

How many Octets does the smallest possible IPV6 datagram contain? The maximum size of an Ipv6 datagram is 65575 bytes, with the 0 bytes Ipv6 header. Ipv6 also describe a minim

Function of osi transport layer, Q. Function of OSI Transport Layer? - ...

Q. Function of OSI Transport Layer? - It takes the information to be sent as well as breaks it into individual packets that are sent and reassembled into a complete message by

Is the address bus unidirectional, The address bus is unidirectional due to...

The address bus is unidirectional due to the address information is always given by the Micro Processor to address a memory location of an input or output devices.

Sap system-wide security settings, You are required to review the system-wi...

You are required to review the system-wide security settings on our SAP system. The data file RSPARAM contains an extract from the client's system. You are to produce a report (

Classification according to pipeline configuration, Classification accordin...

Classification according to pipeline configuration: According to the configuration of a pipeline, the following parts are recognized under this classification: Unifunct

What are sections, Layout pages, can describe sections, which can then be o...

Layout pages, can describe sections, which can then be overridden by particular views making use of the layout. Major and overriding sections is optional.

Advantages of using the electronic mail system, Question : a) E-mail is...

Question : a) E-mail is a common feature nowadays in IT. What does it stands for and what is it used for? b) Briefly describe four advantages of using the electronic mail s

Explain dynamic server creation briefly, Explain dynamic server creation br...

Explain dynamic server creation briefly. Dynamic Server Creation: If only one server handles one request at a time, each client should wait while the server fulfils the on

What are the disadvantages of fcfs scheduling algorithm, What are the disad...

What are the disadvantages of FCFS scheduling algorithm as compared to shortest job first (SJF) scheduling? Disadvantages: (i) Waiting time can be huge if short requests w

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd