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

Analysis of website, In this part you are required to review and critique a...

In this part you are required to review and critique a website of a café or a restaurant of your choice. Your report should be a minimum 500 words with a maximum of 1000 words. You

Is it possible to create graph form spreadsheets, Is it possible to create ...

Is it possible to create graph form spreadsheets For example IF G5 > 100 THEN "Y" ELSE "N" -  It's also possible to create graphs and charts from spreadsheets (such as using

What is logical address space and physical address space, What is logical a...

What is logical address space and physical address space? The set of all logical addresses generated by a program is known as a logical address space; the set of all physical a

What is digital switch, Digital switch It is a device that handles digi...

Digital switch It is a device that handles digital signals formed at or passed by a telephone company's central office and sends them across the company's backbone network.

What is switched mode power supply, Q. What is Switched Mode Power Supply? ...

Q. What is Switched Mode Power Supply? SMPS is the unit into which electric supply from the mains is connected to your PC and this supplies DC to internal circuits. It is more

Produce an analysis model of the proposed system, Question: Read the fo...

Question: Read the following case study and answer the questions based on it. The local airline company needs to develop a system for controlling air traffic at the airport

Replacement and substitution, Replacement and substitution: However, e...

Replacement and substitution: However, equivalences allow us to change one sentence with another without affecting the meaning, it means we know already that replacing one sid

Explain the handshaking signals, a. Explain the hardware mechanism for hand...

a. Explain the hardware mechanism for handling multiple interrupt requests. b. What are handshaking signals? Describe the handshake control of data transfer during input and out

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